type 1 vs type 2 diabetes eye exam

🔥+ type 1 vs type 2 diabetes eye exam 03 Jul 2020 And, if you are worried about getting diabetes, there are things you can do to lower your risk. What Is Diabetes? Our bodies change the food we eat into glucose.

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Review: Neurology and medicine
Diabetes mellitus and the nervous system
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  1. P J Watkinsa,
  2. type 1 vs type 2 diabetes eye exam carb count (⭐️ edema) | type 1 vs type 2 diabetes eye exam blood sugar after eatinghow to type 1 vs type 2 diabetes eye exam for P K Thomasb
  1. aDiabetic Department, King’s College Hospital, London, UK, bUniversity Department of Clinical Neurosciences, Royal Free Hospital School of Medicine, London, UK
  1. Professor PK Thomas, University Department of Clinical Neurosciences, Royal Free Hospital School of Medicine, Rowland Hill Street, London NW3 2PF, UK. Telephone 0044 171 830 2869; fax 0044171 431 1577.

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    type 1 vs type 2 diabetes eye exam diet plan printable (🔴 example) | type 1 vs type 2 diabetes eye exam physiologyhow to type 1 vs type 2 diabetes eye exam for Diabetes mellitus is a disorder in which the concentration of blood glucose is persistently raised above the normal range. It occurs either because of a lack of insulin or because of the presence of factors which oppose the action of insulin. Hyperglycaemia results from insufficient insulin action. There are many associated metabolic abnormalities—notably, the development of hyperketonaemia when there is a severe lack of insulin, together with alterations of fatty acids, lipids, and protein turnover. Diabetes is a permanent condition in all but a few special situations in which it can be transient.

    A wide variety of disturbances affecting the central and peripheral nervous systems, either directly or indirectly, may be encountered in patients with diabetes mellitus. This short selective review concentrates on recent progress in the delineation of the clinical features of the neurological syndromes related to diabetes and their management. It will deal, sequentially, with the classification of diabetes, a listing of some genetic disorders that may be accompanied by diabetes, the consequences of acute metabolic decompensation, and somatic and autonomic neuropathies, cerebrovascular disease, certain infections that have a particular association with diabetes and, finally, congenital malformations.

    Classification

    The division of diabetes into two major types has long been known. The current classification1 (table 1) distinguishes type 1 (otherwise known as insulin dependent diabetes mellitus, IDDM) and type 2 (non-insulin dependent diabetes mellitus, NIDDM). This classification is important because the two types are distinct both in causation and management and is thus of direct clinical relevance.

    View this table:
    Table 1

    Aetiological classification of diabetes mellitus

    In Western Europe, type 1 diabetes accounts for perhaps 10%-20% of all patients, although in the world at large there seems to be an extraordinary increase in type 2 diabetes from an estimated 124 million at present to a predicted 221 million by the year 2010 with only 3% of all patients with type 1 diabetes. The many other types of diabetes, either secondary to other causes or specific genetic syndromes, account for only a small proportion of patients (table 1).

    Some genetic disorders associated with diabetes (table 1)

    MITOCHONDRIAL DISORDERS

    Mitochondria possess their own DNA (mtDNA), which is arranged as a discrete circular molecule encoding for a proportion of the peptides required for the components of the respiratory chain. MtDNA is passed exclusively down the maternal line of inheritance. There are several reported mutations in the tRNA Leu(UUR) gene, the one most often found occurring at position 3243.2 3 These mutations are associated with maternally inherited diabetes combined with sensorineural deafness (MIDD) and accounts for around two type 2 diabetic patients in every 1000 and less than half that number among type 1 patients. Diabetes has also been reported in patients with the same mutation causing the MELAS syndrome—that is, patients with associated myopathy, encephalopathy, lactic acidosis, and stroke-like episodes, and in the Kearns-Sayre syndrome.

    Mitochondrial related diabetes usually presents at between 30 and 40 years of age and is due more to impaired insulin secretion than insulin resistance.4 Some patients come to need insulin treatment and some can even develop diabetic ketoacidosis. As well as deafness, other neuromuscular features are sometimes seen in diabetic patients with this mutation: some may have a myopathy (with ragged red fibres), and a group of five patients with insulin induced painful neuropathy has been described with the 3243 mutation.5 The prevalence of complications seems similar to that among diabetic patients without this mutation, so that meticulous control of diabetes in this condition is just as important as in others.

    FRIEDREICH’S ATAXIA

    Friedreich’s ataxia is an autosomal recessive spinocerebellar degeneration that has recently been shown to be due to an intronic GAA repeat expansion on chromosome 9q6resulting in a defect in its gene product frataxin. The function of frataxin is unknown but there is evidence that it is a mitochondrial protein7 and that its deficiency leads to abnormal energy metabolism.8 Between 10% and 20% of patients with Friedreich’s ataxia develop diabetes.9 This always begins after the onset of the neurological symptoms and is insulin dependent. Ketoacidosis may occur. There is some suggestion for clustering of diabetes within families. It is important that patients with Friedreich’s ataxia should be tested for glycosuria at roughly 6 monthly intervals.

    type 1 vs type 2 diabetes eye exam onset symptoms (🔴 is characterized by) | type 1 vs type 2 diabetes eye exam take insulinhow to type 1 vs type 2 diabetes eye exam for WOLFRAM SYNDROME

    Wolfram syndrome is a rare recessively inherited form of insulin dependent diabetes (type 1) associated with diabetes insipidus, optic atrophy causing blindness and deafness (hence DIDMOAD syndrome).10 Although best known as an endocrine disorder, the clinical features are predominantly neurological and include late onset cerebellar ataxia, psychiatric disturbances, anosmia, apnoeic episodes, and startle myoclonus. Its course is one of gradual decline and premature death. The exact genetic the 1 last update 03 Jul 2020 defect is not known but there is evidence of linkage to chromosome 4, and evidence for a mitochondrial defect has also been presented.Wolfram syndrome is a rare recessively inherited form of insulin dependent diabetes (type 1) associated with diabetes insipidus, optic atrophy causing blindness and deafness (hence DIDMOAD syndrome).10 Although best known as an endocrine disorder, the clinical features are predominantly neurological and include late onset cerebellar ataxia, psychiatric disturbances, anosmia, apnoeic episodes, and startle myoclonus. Its course is one of gradual decline and premature death. The exact genetic defect is not known but there is evidence of linkage to chromosome 4, and evidence for a mitochondrial defect has also been presented.

    Acute metabolic decompensation

    DIABETIC KETOACIDOSIS

    Diabetic ketoacidosis occurs in type 1 diabetes either as a result of absolute or relative insulin lack. It occurs either as the presentation of newly diagnosed diabetes, as a consequence of omitting insulin or inappropriately reducing its dose, or in the presence of intercurrent illness, especially acute infections when the insulin is not increased in time to conteract the relative insulin resistance. Patients with ketoacidosis may be drowsy but are not normally unconscious unless in extremis.

    HYPEROSMOLAR ENCEPHALOPATHY

    Hyperosmolar non-ketotic “coma” (HONK) usually occurs in older patients with type 2 diabetes, often in AfroCaribbean patients, and much less often in insulin dependent patients. The presence of a small amount of circulating insulin is sufficient to suppress ketogenesis but not to prevent hyperglycaemia. Extreme hyperglycaemia (range 40–80 mmol/l) combined with hypernatraemia results in considerable hyperosmolality.

    The level of consciousness is related to the degree of hyperosmolality. Patients are not infrequently stuporose, and sometimes unconscious. Focal or generalised seizures sometimes occur and very rarely dystonic movements are witnessed. These neurological features resolve completely when the metabolic state has returned to normal.

    CEREBRAL OEDEMA

    Cerebral oedema is a well known but rare and potentially fatal complication of diabetic ketoacidosis, which occurs during apparently successful treatment. Children are particularly vulnerable and some 1% to 2% may develop clinically apparent cerebral oedema during treatment. The exact cause is uncertain but electrolyte exchanges in and out of cells with a net influx of sodium into the cells might be responsible.11 Cerebral oedema usually occurs within 8 to 24 hours after starting treatment with intravenous fluids and insulin. Excessively rapid correction of hyperosmolality or the use of hypotonic saline are thought to be precipitating factors. Patients who have shown every sign of recovery then unexpectedly decline. Those who show clinical signs of raised intracranial pressure or cerebral herniation are unlikely to recover. The use of mannitol or dexamethasone is advocated but evidence of their effectiveness is lacking.

    HYPOGLYCAEMIA12

    Most patients treated with insulin, and some on excessive doses of sulphonylureas, experience hypoglycaemia at some time. Indeed, it represents the sole major hazard of insulin treatment. Patients may experience symptoms of hypoglycaemia when the blood glucose is less than 3 mmol/l although some who have lost their alerting symptoms may pass below this threshold without warning.

    Symptoms and signs of hypoglycaemia are summarised in table 2. Most patients develop appropriate warning symptoms, many of which represent autonomic stimulation, and they are capable of taking corrective action by swallowing simple sugars to correct the hypoglycaemia. The onset of neuroglycopenic features is however, associated with diminished cognitive function which may lessen the capacity to take corrective measures. Untreated hypoglycaemia can then progress to restless or even violent behaviour, unconsciousness, seizures, and (rarely) reversible hemiplegia.

    View this table:
    type 1 vs type 2 diabetes eye exam mayo clinic (🔥 explained) | type 1 vs type 2 diabetes eye exam too much insulinhow to type 1 vs type 2 diabetes eye exam for Table for 1 last update 03 Jul 2020 2Table 2

    Clinical features of hypoglycaemia

    Loss of warning of hypoglycaemia is the problem which all insulin treated diabetic patients dread. It is common and about 1 in 10 patients each year need assistance from another person. The mechanisms which underlie this state are poorly understood, although it is now clear that it is much commoner in those who have frequent hypoglycaemic episodes associated with tight control of their diabetes. In this situation the threshold for sympathetically driven counter regulatory responses and hypoglycaemic symptoms is reduced below that at which cognitive impairment takes place. This abnormal sequence can have disastrous effects for patients, especially in potentially dangerous situations such as driving; it is, however, reversible and hypoglycaemic warning symptoms can be restored to their normal threshold if meticulous attention is paid to the elimination of all hypoglycaemic events. Warning can be restored by the infusion of other metabolites such as lactate and there are now extensive research projects in progress to discover ways of avoiding and correcting loss of warning of hypoglycaemia. There is no evidence that preparations of human insulin provoke this problem more readily than the animal insulins, although when patients think this to be the case it is standard practice to change them to animal insulin at the same time as taking all the other precautions needed to avoid hypoglycaemia.

    type 1 vs type 2 diabetes eye exam oral medications (⭐️ need insulin) | type 1 vs type 2 diabetes eye exam with fastinghow to type 1 vs type 2 diabetes eye exam for Death does not normally occur during hypoglycaemic episodes even when they are severe. The profound and protracted hypoglycaemia resulting from deliberate insulin overdosage can, however, be fatal but many sufferers recover, often with apparent lack of intellectual loss. The cause of the very rare “dead in bed” syndrome described in some young type 1 patients is not known and only speculatively associated with hypoglycaemia and perhaps hypokalaemia as well. Whether intellectual decline occurs as a result of repeated hypoglycaemia is still debated; recurrent severe hypoglycaemia sufficient to cause convulsions in childhood might be detrimental in this regard but in general it is not.

    Postmortem studies of hypoglycaemic brain injuries show a specific distribution of lesions. Temporal lobe and hippocampal cortical lesions are the most extensive whereas the brainstem, cerebellum, and spinal cord seem relatively resistant to hypoglycaemic damage.

    Neuropathies of diabetes

    type 1 vs type 2 diabetes eye exam blood sugar range chart (🔴 reasons) | type 1 vs type 2 diabetes eye exam quizlethow to type 1 vs type 2 diabetes eye exam for Various different neuropathy syndromes may be encountered in patients with diabetes (table 3), this probably reflecting a range of underlying disease mechanisms. These syndromes can occur in isolation or in combination.

    View this table:
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    Classification of the diabetic neuropathies

    Neuropathies are common in both type 1 and type 2 diabetes and there are no major structural differences in the pathology of the nerves in the two diabetes types. However, there are some important clinical distinctions. Thus symptomatic autonomic neuropathic syndromes almost invariably occur in established long duration type 1 diabetic patients in middle age. By contrast the reversible mononeuropathies occur much more often in older men with type 2 diabetes. There are no known reasons for these clinical differences.

    HYPERGLYCAEMIC NEUROPATHY

    Patients with newly diagnosed or poorly controlled diabetes may experience uncomfortable dysaesthesiae or pain in the feet and lower legs, which rapidly resolve on establishment of euglycaemia. Diabetic nerve is known to be hypoxic.13 Experimental studies in rats have shown that hyperglycaemic but not normoglycaemic hypoxia gives rise to alterations in fast K+ conductance and after potentials, related to axoplasmic acidification.14 This might contribute to the occurrence of positive symptoms by the generation of ectopic impulses. Nerve conduction velocity is reduced in poorly controlled diabetic patients and recovers rapidly with correction of the hyperglycaemia.15 16 The peripheral nerves also show an abnormal resistance to ischaemic conduction failure17which may be noticed by patients as a diminished tendency to develop ischaemic paraesthesiae on nerve compression. This is probably explicable in terms of a switch to anaerobic glycolysis in diabetic nerve.18

    DIABETIC SENSORY POLYNEUROPATHY

    This is the commonest form of diabetic neuropathy. It consists of a distal symmetric polyneuropathy which develops insidiously and which may be the presenting feature in type 2 diabetes. Reported studies on the prevalence of diabetic neuropathy are difficult to evaluate because of lack of consistency in the definition of neuropathy and in the methods employed for its detection. Observations on the incidence of neuropathy in patients attending diabetic clinics provide information on selected groups of patients. The most comprehensive population based investigation so far reported was undertaken by Dyck et al 19 on residents of Rochester, MN, USA, with diabetes, of whom 26.8% were type 1 and 73.2% type 2. Neuropathy was assessed by a combination of clinical and electrophysiological criteria. Of the patients with type 1 diabetes, 66% had some form of neuropathy, in 54% of whom it was diabetic polyneuropathy. In type 2 patients, 59% had various neuropathies, of which it was polyneuropathy in 45%. Symptomatic neuropathy occurred in 15% of type 1 and 13% of type 2 patients. Severe polyneuropathy was encountered only in 6% of type 1 and 1% of type 2 patients; it was defined by weakness of dorsiflexion at the ankles such that the patients were unable to walk on their heels.

    Diabetic polyneuropathy gives rise to sensory impairment with a “glove and stocking” distribution. All forms of sensation may be affected but there is evidence that those mediated by small myelinated and unmyelinated axons are affected first.20 Involvement of large fibres sufficient to cause sensory ataxia (diabetic pseudotabes) is now rare. Diabetic sensory polyneuropathy is often initially asymptomatic and is only discovered on neurological examination or when secondary complications develop, but it may present the 1 last update 03 Jul 2020 with numbness, pain, and paraesthesiae, mainly distally in the lower limbs. Autonomic neuropathy commonly coexists; minor distal motor involvement may be evident, but a significant distal motor neuropathy is uncommon.Diabetic polyneuropathy gives rise to sensory impairment with a “glove and stocking” distribution. All forms of sensation may be affected but there is evidence that those mediated by small myelinated and unmyelinated axons are affected first.20 Involvement of large fibres sufficient to cause sensory ataxia (diabetic pseudotabes) is now rare. Diabetic sensory polyneuropathy is often initially asymptomatic and is only discovered on neurological examination or when secondary complications develop, but it may present with numbness, pain, and paraesthesiae, mainly distally in the lower limbs. Autonomic neuropathy commonly coexists; minor distal motor involvement may be evident, but a significant distal motor neuropathy is uncommon.

    In recent years, protocols have been developed to establish minimum criteria for the detection of diabetic neuropathy and criteria for its staging.21-23 These are essential for epidemiological studies and treatment trials. Less elaborate schemes are also available, suitable for the recognition of neuropathy during patient monitoring in diabetic clinics.24

    Once established, diabetic sensory polyneuropathy is largely irreversible.25 The Diabetes Control and Complications Trial (DCCT) has shown that strict glycaemic control in patients with type 1 diabetes mellitus by continuous subcutaneous insulin infusion or multiple daily insulin injections reduces the risk of developing diabetic neuropathy, but at the cost of a threefold increase in severe hypoglycaemic episodes.26 Whether strict glycaemic control would have a similar beneficial effect on the development of neuropathy in type 2 diabetes mellitus is unknown.

    Foot ulceration

    Diabetic sensory polyneuropathy is a major risk factor for the development of plantar ulceration because of the loss of protective sensation.27 28 Autonomic neuropathy which gives rise to anhidrosis and dry fissured skin also contributes, as does foot deformity, which leads to abnormal pressure distribution in the foot when standing or walking.29 Foot oedema also constitutes a major risk factor for foot ulceration. It may occur secondary to neuropathy. It probably results from loss of the venevasomotor reflex because of sympathetic failure. This reflex is normally activated on standing. Its loss results in the foot being unable to compensate for the rise in venous pressure when the patient is upright. Ephedrine administration can be helpful in the treatment of neuropathic oedema30 (see later). In the United Kingdom, foot ulceration is present in about 5% of the diabetic population.31 It is a major cause of disability and of occupancy of hospital beds. Monitoring patients for loss of protective sensation that could predispose to plantar ulcers, patient education for their prevention, and treatment should ulceration develop are vital aspects in the management of patients with diabetic neuropathy.32

    type 1 vs type 2 diabetes eye exam education (👍 normal) | type 1 vs type 2 diabetes eye exam and covid-19how to type 1 vs type 2 diabetes eye exam for Neuropathic osteoarthropathy (Charcot joints)

    Neuropathic joint degeneration affects about 10% of patients with neuropathy and more than 16% of those with a history of plantar ulceration.27 Recurrent trauma related to loss of protective joint sensation33 and osteopenia,34 possibly because of increased blood flow from sympathetic denervation,35 are the main predisposing factors. It has been noted that diabetic patients who have received a renal transplant have a substantially higher risk of developing neuropathic osteoarthropathy.36 The precise explanation is unknown but prolonged corticosteroid administration may be relevant. The most commonly affected joints are the tarsometatarsal, followed by the metatarsophalangeal and then the subtalar and ankle joints.37 Management is difficult. For an acutely inflamed joint, immobilisation and cessation of weight bearing for 2–3 months is required to permit bone repair. Recently the use of bisphosphonates to inhibit osteoclast activity has been recommended.38

    Unrecognised fractures occur in patients with diabetic sensory neuropathy. In a comparison of patients with diabetic neuropathy with and without a history of foot ulceration, non-neuropathic diabetic patients, and non-neuropathic controls, 22.2% of the neuropathic patients with a history of foot ulceration showed radiological evidence of fractures, usually of the metatarsal shafts. This was rare in the other three groups.39

    ACUTE PAINFUL DIABETIC NEUROPATHY

    This uncommon syndrome is distinct from diabetic sensory polyneuropathy.40 It is of acute or subacute onset and is characterised by burning or aching pain felt mainly in the lower limbs, and very rarely in the hands or over the upper limbs and trunk. It is accompanied by widespread cutaneous contact hyperaesthesia. Accompanying neurological signs are often not obtrusive with only slight distal sensory loss in the legs and depression of the ankle jerks. Motor signs do not occur. The relative lack of abnormal findings may suggest a psychogenic explanation for the symptoms. There may be associated depression. In the male, impotence may occur but otherwise autonomic manifestations are not prominent.

    type 1 vs type 2 diabetes eye exam rice (☑ natural supplements) | type 1 vs type 2 diabetes eye exam diet planhow to type 1 vs type 2 diabetes eye exam for Acute painful diabetic neuropathy may be associated with severe rapid weight loss40 41 and has been described in girls with anorexia nervosa.42 It may also follow the institution of tight glycaemic control.43 44 Treatment is by strict glycaemic control, even in those cases when it is precipitated by treatment. Recovery usually occurs over a period of 6–9 months.

    AUTONOMIC NEUROPATHY

    Damage to small myelinated and unmyelinated nerve fibres is one of the characteristics of diabetic neuropathy which gives rise to autonomic failure together with reduced thermal and pain sensation. Damage to small nerve fibres can occur either selectively or, more commonly, it accompanies impairment of other sensory modalities due to loss of large nerve fibres. The characteristics of neuropathies seen in diabetic patients are in part due to this pattern of fibre loss.

    The occurrence of iritis requiring topical steroid treatment has been seen in association with symptomatic autonomic neuropathy.45 There is no clear explanation for this association. Nerve growth factor is known to accumulate in the denervated iris in experimental models and might serve as a mediator of the inflammatory responses.On the other hand, an immune mediated response may be responsible, as it is in other forms of iritis. There is also additional evidence that autoimmune mechanisms may play some part in the development of the small fibre damage involved in diabetic autonomic neuropathy. The presence of lymphocytic infiltration in autonomic tissues examined at necropsy,46 together with circulating immune complexes and activated T cells, all support this concept. Autoantibodies to the vagus nerve and cervical sympathetic ganglion in insulin dependent diabetic patients have also been found, although their exact relation with neuropathy remains uncertain.

    Numerous functional abnormalities in organs that receive an autonomic innervation occur in patients with long standing diabetes (table 4). Many of these defects have no clinical manifestations and, alone, do not adversely affect prognosis. None the less, the symptoms of autonomic neuropathy can be extremely disagreeable, and disabling if several occur together. Gustatory sweating is the most common, followed by orthostatic hypotension and diarrhoea. Impotence is relatively common in diabetic men and is a feature of autonomic neuropathy, although psychogenic and vascular factors contribute in many cases. Bladder hypotonia and gastroparesis severe enough to cause symptoms are rare.

    Table for 1 last update 03 Jul 2020 4Table 4

    Clinical features of autonomic neuropathy

    Autonomic neuropathy was previously thought to impair awareness of hypoglycaemia. This notion has now been refuted, although some neuroendocrine responses to hypoglycaemia are blunted in patients with neuropathy.

    Many problems of autonomic neuropathy are due to sympathetic denervation of vascular smooth muscle in different tissues and organs. Some of these problems, together with their functional and clinical consequences, are considered next.

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    Sympathetic denervation of blood vessels causes structural and functional changes in arterial smooth muscle. Degenerative changes lead to calcification and even ossification and thus to stiffening of the arteries.47 The cause of these changes is unknown, but there is early evidence in diabetic arteries for expression of mRNA for Gla protein and osteopontin which may promote calcification. Whether neuropathy is the cause of the molecular changes is unknown. Calcification is also known to occur in the smooth muscle of the vas deferens in long term diabetes; this tissue has a rich sympathetic innervation and degenerative changes might be due to similar processes to those in the arteries.

    Peripheral vascular sympathetic denervation48 causes peripheral vasodilatation associated with the opening of arteriovenous shunts. A substantial increase in blood flow results, which is on average five times higher in neuropathic patients than in controls, and can even be demonstrated without clinical evidence of neuropathy. Some of the clinical features of the neuropathic foot are explained by these changes in blood flow; the feet are excessively warm, have bounding pulses the 1 last update 03 Jul 2020 and marked venous distension, and the venous PO2 is increased as a result of the excessive arteriovenous shunting. Neuropathic oedema results from these haemodynamic changes and is occasionally severe. Bone blood flow is raised in these patients and, as already discussed, may in turn contribute to the osteopenia which predisposes to the development of Charcot’s neuroarthropathy.Peripheral vascular sympathetic denervation48 causes peripheral vasodilatation associated with the opening of arteriovenous shunts. A substantial increase in blood flow results, which is on average five times higher in neuropathic patients than in controls, and can even be demonstrated without clinical evidence of neuropathy. Some of the clinical features of the neuropathic foot are explained by these changes in blood flow; the feet are excessively warm, have bounding pulses and marked venous distension, and the venous PO2 is increased as a result of the excessive arteriovenous shunting. Neuropathic oedema results from these haemodynamic changes and is occasionally severe. Bone blood flow is raised in these patients and, as already discussed, may in turn contribute to the osteopenia which predisposes to the development of Charcot’s neuroarthropathy.

    Blood flow responsiveness to various stimuli is also abnormal. The best known is the reduction of peripheral vasoconstriction in response to sympathetic stimuli either on coughing or standing up—the latter in part responsible for orthostatic hypotension. Paradoxical responses also occur—notably, the vasoconstrictor response which takes place on heating rather than the expected vasodilatation,49 and the vascular effects of insulin which lead to a reduction rather than an increase of peripheral vascular resistance and may be the mechanism by which insulin exacerbates orthostatic hypotension.50

    type 1 vs type 2 diabetes eye exam events (🔴 insulin dependent) | type 1 vs type 2 diabetes eye exam untreatedhow to type 1 vs type 2 diabetes eye exam for These findings on structural and functional changes of the peripheral vasculature in diabetic neuropathy have resulted in at least one new treatment—namely, the use of ephedrine (a sympathomimetic stimulant) to alleviate neuropathic oedema.30 The effects can be dramatic; dosage starts at 30 mg three times a day increasing to a maximum of 60 mg three times a day. It can be used for this purpose indefinitely without tachyphylaxis.

    ORTHOSTATIC HYPOTENSION

    The most serious clinical consequence of vascular denervation is orthostatic hypotension. It is due to diminished peripheral vasoconstriction and some failure of splanchnic blood flow reduction on standing, but these defects are not as marked as would be expected even in severe cases. Noradrenaline concentrations are normally reduced in these patients, whereas renin responses may or may not be abnormal.

    Measured orthostatic hypotension, defined as a decrease of systolic blood pressure on standing of more than 30 mm Hg, is not uncommon in diabetic neuropathy although symptoms are rare. Patients may then complain at the least of mild giddiness and at most may be disabled by the condition, unable to stand for more than a few minutes at a time, although this state is very rare. Symptoms range from mild giddiness or muzzy headedness on standing up, progressing to a grey mistiness of vision followed by a curious pain in the back of the neck and shoulders in a “coat hanger” distribution51 and later unconsciousness. Distortion of vision can occur. Symptoms are often worse on rising from bed in the morning, but they vary substantially both through the day and from week to week, ranging from negligible to severe. They do not show very close correlation with actual fall of blood pressure although when the systolic pressure is less than 70 mm Hg few patients can remain upright. Orthostatic hypotension is exacerbated by insulin administration,50 52 and just occasionally episodes of loss of consciousness from insulin induced orthostatic hypotension are confused with those from hypoglycaemia. Orthostatic hypotension can persist over many years and apart from the rare patients who develop disabling disease it often fails to progress even during 10–15 years. It never remits completely.

    type 1 vs type 2 diabetes eye exam charts (🔴 kids) | type 1 vs type 2 diabetes eye exam natural medicationshow to type 1 vs type 2 diabetes eye exam for Treatment is needed when symptoms become troublesome. Firstly, drugs which exacerbate hypotension—notably, diuretics, tranquilisers, and antidepressants—should be stopped. Raising the head of the bed using 9 inch (23 cm) blocks, and full length elastic stockings can help. Measures which increase blood volume are the most valuable and include a high salt intake and the use of fludrocortisone to a maximum of 0.4 mg-0.6 mg daily; sometimes the oedema which results is unacceptable. Sympathomimetic agents may have a limited effect, especially midodrine which is an adrenergic agonist (available in the United Kingdom on a named patient basis). Non-steroidal anti-inflammatory drugs and ephedrine may help; pindolol, ergotamine, octreotide, clonidine, and metoclopramide have theoretical advantages but are not clinically useful.

    The survival of patients with orthostatic hypotension is worse than for those with other autonomic symptoms alone. The development of left ventricular hypertrophy may be the cause for the higher mortality from myocardial infarction. It is likely to be due to higher blood pressures during the night which result from the loss of the normal diurnal-nocturnal fluctuations of blood pressure described in patients with autonomic neuropathy.

    SYMPATHETIC DENERVATION OF THE KIDNEY AND ERYTHROPOIETIN

    Erythropoietin production is stimulated chiefly by hypoxia and anaemia and is impaired in renal failure and some other chronic diseases. The kidney receives a rich sympathetic innervation which modulates erythropoietin production. Experimental renal denervation leads to a reduced erythropoietin production in response to hypoxia and early reports on some patients with multisystem atrophy and a few diabetic patients have indicated erythropoietin depletion.53

    In a preliminary study of 15 patients with severe symptomatic autonomic neuropathy, including postural hypotension but without renal failure, examined at King’s College Hospital, 10 were found to be anaemic (mean haemoglobin 10.9 (SD 0.2) g/dl), occasionally considerably for 1 last update 03 Jul 2020 so, and several had haemoglobin values below 10 g/dl without other causes for their anaemia. Serum erythropoietin concentrations for these anaemic neuropathic patients were much lower than expected. It seems that diabetic autonomic neuropathy can cause anaemia from erythropoietin deficiency. Preliminary studies have shown that the anaemia responds rapidly to erythropoietin treatment although its effect in improving orthostatic hypotension still requires evaluation.In a preliminary study of 15 patients with severe symptomatic autonomic neuropathy, including postural hypotension but without renal failure, examined at King’s College Hospital, 10 were found to be anaemic (mean haemoglobin 10.9 (SD 0.2) g/dl), occasionally considerably so, and several had haemoglobin values below 10 g/dl without other causes for their anaemia. Serum erythropoietin concentrations for these anaemic neuropathic patients were much lower than expected. It seems that diabetic autonomic neuropathy can cause anaemia from erythropoietin deficiency. Preliminary studies have shown that the anaemia responds rapidly to erythropoietin treatment although its effect in improving orthostatic hypotension still requires evaluation.

    GASTROPARESIS

    Vomiting from gastroparesis is a rare complication of autonomic neuropathy.54 It is usually intermittent, and only rarely so persistent that surgical measures may be needed. Gastroparesis is characterised by a gastric splash and radiologically by large food residues, absent peristalsis, a failure to empty the stomach, and a patulous pylorus.

    type 1 vs type 2 diabetes eye exam treatment diet (🔴 meal plan) | type 1 vs type 2 diabetes eye exam risehow to type 1 vs type 2 diabetes eye exam for The cause of gastroparesis is uncertain.55 It is usually attributed to denervation and there is evidence (although not consistent) for fibre loss in the vagus nerve.56Denervation of gut smooth muscle normally causes muscular hypertrophy, yet our own findings on specimens taken from patients with gastroparesis undergoing gastrectomy show that the opposite has occurred; there is evidence of smooth muscle atrophy and degeneration in the muscularis propria with fibrosis between muscle bundles similar to that seen in known cases of gut myopathy. Distinctive “M” bodies have also been found in smooth muscle cells: these appear as intracellular round eosinophilic bodies and are probably a degenerative phenomenon.57 Gastroparesis may, at least in some cases, be due to gastromyopathy.

    Treatment of vomiting from gastroparesis is difficult to evaluate because symptoms are usually intermittent. Dopamine antagonists (metoclopramide and domperidone) enhance gastric tone and emptying.58 They may accelerate gastric emptying in diabetic autonomic neuropathy with some effect. The motility stimulant cisapride can also be tried. These drugs form the mainstay of treatment during vomiting bouts. The use of erythromycin has been described recently; this binds to motilin receptors and acts as a motilin agonist.59 Intravenous erythromycin causes a substantial acceleration of gastric emptying; oral administration is less effective and whether or not it is a useful approach is still uncertain.

    Persistent and intractable vomiting from gastroparesis is very rare. Endoscopic insertion of a gastrostomy or jejunostomy tube for self feeding is now possible and of value and if symptoms remit the tube is simply withdrawn. In patients in whom total gastric stasis can be proved, and vomiting is truly persistent and intolerable, definitive surgery can help. A two thirds gastrectomy with a low Roux-en-Y loop 60 cm beyond the anastomosis has had considerable success in four of our patients with this rare condition (N Ejskjaer et al, unpublished observations). This approach seems more successful than the more limited surgery performed in the past.

    DIABETIC DIARRHOEA

    Diabetic diarrhoea is a very disagreeable symptom of autonomic neuropathy. Borborygmi and discomfort precede attacks of watery diarrhoea, without pain or bleeding, and usually without evidence of malabsorption. Faecal incontinence is common, especially at night, when exacerbations seem to be worse. Symptoms last from a few hours to a few days and then remit, with normal bowel action or even constipation (sometimes induced by treatment) between attacks. Intermittent attacks of diabetic diarrhoea tend to persist over many years and rarely remit completely. Very occasional patients have almost continuous diarrhoea for which no other cause is discovered, and they are extremely difficult to treat.

    The underlying cause of diabetic diarrhoea is not established. Gut denervation probably alters gut motility and bacterial overgrowth has been found in these cases, yet many other mechanisms are possible and have not been well studied.60

    Full investigation of diarrhoea in a diabetic patient is crucial so as not to overlook easily treatable causes such as coeliac disease, the frequency of which may be increased in type 1 diabetes, pancreatic malabsorption, or other rarer causes. Normal autonomic function tests virtually exclude visceral neuropathy as a cause. Nevertheless, the presence of abnormal autonomic function is not in itself sufficient to establish a diagnosis of diabetic diarrhoea and may thus be very deceptive. The diagnosis is most likely to be correct in long standing type 1 patients with other autonomic symptoms such as gustatory sweating and orthostatic hypotension.

    Tetracycline offers effective treatment in about half of the patients, and is given in one or two doses of 250 mg at the onset of an attack which is abruptly aborted. If this fails, a range of antidiarrhoea remedies can be tried—notably, codeine phosphate, lomotil, or loperamide (Imodium). Clonidine has also been proposed. The use of somatostatin as its analogue octeotride has been suggested: its general gut antisecretory effect is effective in the watery diarrhoea of the VIPoma syndrome and it may help to alleviate the symptoms of diabetic diarrhoea although further investigation is needed.

    OESOPHAGUS

    Abnormal oesophageal motility has been described in diabetic autonomic neuropathy. No symptoms have been attributed to this functional abnormality.

    GALL BLADDER

    Enlargement of the gall bladder, probably due to poor contraction, may be a feature of diabetes related to autonomic neuropathy. Studies by ultrasonography have not confirmed enlargement of the gall bladder, but do suggest impaired muscular contraction.61 There are no known clinical effects from this. Administration of erythromycin, however, enhances gall bladder emptying.

    DIABETIC CYSTOPATHY62

    Autonomic neuropathy affecting the sacral nerves causes bladder dysfunction. Bladder function tests are commonly abnormal in diabetic patients with neuropathy but symptoms are relatively rare, usually occurring in those who already have advanced complications. Most men with a neurogenic bladder are also impotent.

    Impairment of bladder function is chiefly the result of neurogenic detrusor muscle abnormality, while pudendal innervation of perineal and periurethral striated muscle is usually unaffected in diabetic neuropathy. Afferent damage results in impaired sensation of bladder filling, and leads to detrusor areflexia; thus the bladder for 1 last update 03 Jul 2020 pressure during cystometrography fails to increase as the bladder is filled. In advanced cases, bladder emptying is reduced because of impaired detrusor activity and possibly failure of the internal sphincter to open adequately. Measurements of urinary flow show that the peak flow rate is reduced and that duration of flow is increased.Impairment of bladder function is chiefly the result of neurogenic detrusor muscle abnormality, while pudendal innervation of perineal and periurethral striated muscle is usually unaffected in diabetic neuropathy. Afferent damage results in impaired sensation of bladder filling, and leads to detrusor areflexia; thus the bladder pressure during cystometrography fails to increase as the bladder is filled. In advanced cases, bladder emptying is reduced because of impaired detrusor activity and possibly failure of the internal sphincter to open adequately. Measurements of urinary flow show that the peak flow rate is reduced and that duration of flow is increased.

    There are no symptoms in the early stages, but later patients experience hesitancy during micturition, develop the need to strain, a feeble stream, and a tendency to dribble. Micturition sometimes occurs in short interrupted spurts as the result of straining. Patients may be aware of lengthening intervals between micturition, and also experience a sensation of inadequate bladder emptying. Gradually, residual urine volume increases and, in severe cases, gross bladder retention occurs with abdominal swelling and sometimes overflow incontinence as well. Bladder capacity may exceed one litre.

    The diagnosis of a neurogenic bladder is likely to be made in patients with clinical evidence of severe neuropathy. It is, however, important to exclude bladder neck obstruction and, especially, prostatic obstruction in men as a cause of the patient’s symptoms. Ultrasound examination before and after emptying should be performed, and cystoscopy is usually needed; rarely, diabetic neurogenic bladder causes hydroureter and hydronephrosis. Occasionally, more complex bladder function tests are needed. These include cystograms, cystometrography, and urinary flow rate measurements.

    The principles of treatment are to compensate for deficient bladder sensation and thus prevent the development of a high residual urinary volume. For those diabetic patients who have few symptoms of cystopathy, education is important and may suffice. In particular, the patients should be told to void every three hours during the daytime. With more severe symptoms, more active measures are needed. Prazosin, an α1-adrenoreceptor blocker, may help by reducing urethral resistance. Self catheterisation three times daily is now the recommended treatment for patients with chronic retention. Recurrent urinary tract infections are often troublesome in these patients, and protracted courses of antibiotics, changing monthly, may be needed to prevent this problem.

    IMPOTENCE63

    Autonomic neuropathy is still considered to be the main aetiological factor in diabetic impotence. It is due to erectile failure resulting from damage both to the parasympathetic and sympathetic innervation of the corpora cavernosa. VIPergic nerves are also important in the vasodilatation of erection and the concentration of VIP (vasoactive intestinal peptide) is low in the penile corpora in diabetic patients with autonomic neuropathy. Failure to achieve erection may also be the result of a concomitant sensory deficit in the dorsal nerve of the penis. Impotence may also be due to vascular occlusion of the branches of the internal pudenal artery. In rare cases, erectile failure may be caused by the Leriche syndrome. The onset of neuropathic impotence is usually gradual, progressing slowly over months, but complete erectile failure is usually present within two years of the onset of symptoms. This history contrasts with psychogenic impotence which begins suddenly and in which nocturnal erections are maintained.

    The diagnosis of neuropathic impotence in diabetes is difficult. The use of an intracavernosal injection of prostaglandin E1(Caverject, alprostadil) is to some extent useful in distinguishing neurogenic from vasculogenic impotence—it causes an erection in the first and fails to do so in the second. This is helpful both in terms of diagnosis and giving guidance in the choice of treatment. Autonomic function tests give some guidance as to the presence of autonomic neuropathy, but they do not establish conclusively in a patient whether it is the cause of impotence.

    The rational treatment of diabetic impotence depends on a careful history, in particular to evaluate any psychological component. If this factor is present, then the patient and his partner may be helped by appropriate discussion and advice. For younger patients, rigid penile implants are often successful, especially since ejaculation is often retained. Inflatable prostheses can also be inserted, but are more prone to failure. The intracavernous injection of the vasodilator prostaglandin E1 causes an erection in patients the 1 last update 03 Jul 2020 without severe vascular disease, and offers a treatment which some men find satisfactory; potential problems exist from infection and penile fibrosis and this treatment should only be provided under expert supervision. The use of a vacuum pump applied to a condom is less invasive, and is a technique which some patients find satisfactory, especially if they are properly instructed. In vasculogenic impotence, arterial disease is often distal and arterial reconstruction is only likely to be useful in those patients with major arterial occlusions.The rational treatment of diabetic impotence depends on a careful history, in particular to evaluate any psychological component. If this factor is present, then the patient and his partner may be helped by appropriate discussion and advice. For younger patients, rigid penile implants are often successful, especially since ejaculation is often retained. Inflatable prostheses can also be inserted, but are more prone to failure. The intracavernous injection of the vasodilator prostaglandin E1 causes an erection in patients without severe vascular disease, and offers a treatment which some men find satisfactory; potential problems exist from infection and penile fibrosis and this treatment should only be provided under expert supervision. The use of a vacuum pump applied to a condom is less invasive, and is a technique which some patients find satisfactory, especially if they are properly instructed. In vasculogenic impotence, arterial disease is often distal and arterial reconstruction is only likely to be useful in those patients with major arterial occlusions.

    New treatments using intraurethral prostaglandins, or oral treatment with sildenafil, a for 1 last update 03 Jul 2020 selective inhibitor of type 5 cyclic GMP-specific phosphodiesterase, are under active investigation.New treatments using intraurethral prostaglandins, or oral treatment with sildenafil, a selective inhibitor of type 5 cyclic GMP-specific phosphodiesterase, are under active investigation.

    RESPIRATORY RESPONSES AND ARREST

    Sudden respiratory arrests have been described in diabetic patients with autonomic neuropathy. In most of these episodes, there was some interference with respiration either by anaesthesia or drugs, or bronchopneumonia. These episodes are transient, and although temporary assisted ventilation may be needed, recovery to normal health is expected. Anaesthetists need to be forewarned of this possibility when patients with symptomatic autonomic neuropathy require even minor surgery. Whether respiratory arrest is responsible for the sudden unexplained deaths reported in diabetic patients with autonomic neuropathy is unclear,64 65 but we suspect, from clinical observation, that it might be.

    SWEATING ABNORMALITIES

    Defective sweating in diabetic neuropathy was initially described many years ago.66-68 The sweat gland is an important structure with a complex peptidergic as well as cholinergic innervation. Neuropeptide immunoreactivity, especially for VIP, is low in diabetic sudomotor nerves. There is a renewed interest in sweating dysfunction in diabetic neuropathy, brought about by the development of new techniques. Measurement of sweating in the periphery is one of the few quantitative methods for assessing cholinergic nerve function, although the tests are complex and require special apparatus.

    The most common sweating deficit is in the feet in a classic stocking distribution. There is a close correlation with other autonomic defects, especially with orthostatic hypotension, but also with cardiac vagal denervation, although the cardiovascular function tests tend to be abnormal before there is evidence of peripheral sweating loss. Abnormal responses may be found in cases of painful neuropathy, and patients with truncal mononeuropathies may have patchy sweating defects. These tests all confirm the widespread damage to small nerve fibres which occurs in diabetic neuropathy.

    Gustatory sweating is a highly characteristic symptom of diabetic autonomic neuropathy,67 68 occurring more commonly than previously thought, and seen even more often in those patients who have nephropathy. Sweating begins after starting to chew tasty food, especially cheese. It starts on the forehead, and spreads to involve the face, scalp, and neck and sometimes the shoulders and upper part of the chest, compelling patients to keep a towel at the dinner table. The distribution of the sweating is in the territory of the superior cervical ganglion. It may be of sudden onset; its cause is unknown, although aberrant nerve fibre regeneration has been suggested. Gustatory sweating, once established, generally persists over many years, although there can be a remarkable and unexplained remission after renal transplantation.

    Gustatory sweating is occasionally sufficiently severe to need treatment; anticholinergic drugs are highly effective although side effects may limit their use. Propantheline bromide (Pro-Banthine) can be used. It is given half an hour before meals, but may also be effective if given before single meals at social occasions. Clonidine may help. Recently, the use of glycopyrrolate cream (Robinul) has been described. The cream is made from glycopyrrolate powder (an antimuscarinic anticholinergic agent) combined with a standard cream base (cetamacrogol A), in an 0.5% concentration, although concentrations of 1.0% or 2.0% may be more effective. The cream is applied to the affected areas, avoiding contact with the mouth, nose, and eyes. The area should not be washed for four hours after the application. The only contraindication known is narrow angle glaucoma which may be exacerbated if the eye is accidently contaminated.

    PROGNOSIS

    Autonomic function declines with age, but in diabetes it deteriorates, on average, faster than in normal subjects. Thus variation in heart rate which normally decreases at about 1 beat/min every 3 years declines about three times faster in diabetic patients, although there is substantial variation.69 Most patients who develop abnormal autonomic function do not become symptomatic. Mortality of asymptomatic patients with autonomic dysfunction may be increased but the prognosis is generally good, and 90% of our patients (all under 50 years old at the beginning of the study) were alive 10 years later. By contrast, the outcome for those with symptomatic autonomic neuropathy is not as good, although even in this group, 73% were still alive after a decade. Ewing et al 70 reported a poorer prognosis, although patient selection was different: the patients were older and some had renal damage. Those with orthostatic hypotension seem to have the highest mortality, perhaps because of the premature development of left ventricular hypertrophy. Most deaths in these patients are from renal failure or myocardial infarction. There are a few sudden unexplained deaths among patients with autonomic neuropathy, which might be due to respiratory arrest rather than cardiac arrest or arrhythmia.

    type 1 vs type 2 diabetes eye exam on insulin (🔥 immune system) | type 1 vs type 2 diabetes eye exam treathow to type 1 vs type 2 diabetes eye exam for Established symptoms of autonomic neuropathy, including diarrhoea, vomiting from gastroparesis and postural hypotension run a very protracted although intermittent course and rarely become disabling, even over a 10 to 15 year period.69 Postural hypotension fluctuates substantially with a corresponding variation in the intensity of symptoms. Gustatory sweating also tends to persist without remission, although many patients describe disappearance of this symptom after renal transplantation. The general absence of progression to debilitating disease remains unexplained and contrasts with devastating and, indeed, often fatal progression of the primary autonomic failure. Malins made many of these observations some years ago and wrote that “The prognosis for autonomic manifestations is poor although the disability is often surprisingly slight.”71

    FOCAL AND MULTIFOCAL NEUROPATHIES

    Focal peripheral nerve lesions are commoner in patients with diabetes than in the general population. They result from various causes. There is evidence that isolated third cranial nerve lesions have an ischaemic basis but they are unusual for ischaemic lesions in that they are demyelinating in nature rather than involving axonal destruction.72 The pathological basis may be reperfusion injury which has been shown experimentally to cause demyelination in peripheral nerve.73 The favourable prognosis of diabetic third cranial nerve lesions is explicable in terms of recovery by remyelination.72

    Diabetic nerve shows increased susceptibility to compression injury so that entrapment neuropathies and focal lesions from external compression occur more frequently than in the general population. The reason for the increased susceptibility is not known.

    DIABETIC TRUNCAL RADICULONEUROPATHY

    This manifestation of diabetes often gives rise to diagnostic difficulty, the symptoms suggesting spinal nerve root compression. Radicular pain, focal truncal sensory loss, and cutaneous hyperaesthesia74 and focal weakness of the muscles of the anterior abdominal wall75-77 are the manifestations. The symptoms can be unilateral or bilateral and can involve several adjacent dermatomes or the territories of adjoining intercostal nerves.74 Spontaneous recovery usually occurs within 3 to 6 months.

    PROXIMAL DIABETIC NEUROPATHY

    This not entirely satisfactory label is used to describe cases of unilateral or commonly asymmetric bilateral lower limb motor neuropathy (diabetic amyotrophy). Distal lower limb muscles may also be affected. Radicular sensory loss may be present78 and which in some cases is prominent.79 The onset is most often subacute but it may be insidious. Pain, particularly at night, can be for 1 last update 03 Jul 2020 a troublesome feature. Truncal radiculoneuropathy may coexist and occasionally the upper limbs are affected.80 Spontaneous recovery is frequent,81 although not all patients recover fully.82 This not entirely satisfactory label is used to describe cases of unilateral or commonly asymmetric bilateral lower limb motor neuropathy (diabetic amyotrophy). Distal lower limb muscles may also be affected. Radicular sensory loss may be present78 and which in some cases is prominent.79 The onset is most often subacute but it may be insidious. Pain, particularly at night, can be a troublesome feature. Truncal radiculoneuropathy may coexist and occasionally the upper limbs are affected.80 Spontaneous recovery is frequent,81 although not all patients recover fully.82

    It has recently been shown that in about a third of patients with proximal diabetic neuropathy, inflammatory changes, sometimes vasculitic, are evident on nerve biopsy78 79 so that treatment with corticosteroids, or by immunosuppressive or immunomodulatory measures, might be considered in cases that fail to resolve spontaneously. Results of controlled treatment trials are not available.

    SUPERIMPOSED CHRONIC INFLAMMATORY DEMYELINATING POLYNEUROPATHY (CIDP)

    There is evidence that, as for hereditary motor and sensory neuropathy, CIDP may be superimposed on diabetic neuropathy as a secondary immunological event.83 84 Prominent motor involvement or a reduction of nerve conduction velocity into the demyelinating range would suggest this possibility. Confirmation may be obtained by the finding of oligoclonal IgG bands in the CSF or inflammatory infiltrates on nerve biopsy. Treatment options are as for isolated CIDP.

    Cerebrovascular disease

    Large population studies have shown that strokes are more frequent and have a higher mortality in patients with diabetes.85These studies have disclosed an increase in the relative risk in the female as compared with the diabetic male population. Thus in a study in Sweden, the highest rise was 6-fold in diabetic males but 13-fold in diabetic females.86 The greatest rise is in the 5th and 6th decades, decreasing significantly at later ages.87Previously undetected diabetes is a recognised feature in patients with ischaemic strokes.87 88

    The association of stroke due to cerebral infarction is less closely related to internal carotid disease than in the non-diabetic population.89 Postmortem studies90 have shown that most ischaemic strokes are the result of lacunar infarcts related to occlusion of small paramedian perforating arteries. The main source of thromboembolic strokes in diabetic patients is the internal carotid artery.91 In one study, the frequency of cardioembolic strokes was higher after myocardial infarction in diabetic than in non-diabetic patients,92 although Palumbo et al 93 found that coronary artery disease was not associated with an increased frequency of strokes in their population based study of diabetic patients.

    The frequency of transient ischaemic attacks is also increased in diabetic for 1 last update 03 Jul 2020 patients, but the average age of onset does not differ from a non-diabetic population.93 The frequency of transient ischaemic attacks is also increased in diabetic patients, but the average age of onset does not differ from a non-diabetic population.93

    Hypertension is the main risk factor for strokes in diabetic patients94 and this also applies to transient ischaemic attacks.93 Treatment of hypertension found at the time of diagnosis of diabetes reduces the subsequent risk both of strokes and transient ischaemic attacks.93 Obesity, cigarette smoking, hyperlipidaemia, and glycaemic control have not been found to be independent risk factors for strokes.93 94 The effect of antiplatelet therapy on stroke prevention has not been examined extensively. The American Veterans’ Administration Cooperative Study95 followed up diabetic veterans with recent gangrene and amputation. The incidence of stroke and transient ischaemic attacks was less in the group treated with a combination of aspirin and dipyramidole. This finding is in accord with the fact that platelet adhesiveness is increased in diabetic patients.96 In the European Stroke Prevention Study,97 however, treatment with this combination failed to produce any detectable reduction in the occurrence of strokes, although the number of diabetics included in the study was small.

    type 1 vs type 2 diabetes eye exam natural dressings (⭐️ blood test) | type 1 vs type 2 diabetes eye exam woundshow to type 1 vs type 2 diabetes eye exam for The prevalence of cerebral haemorrhage and subarachnoid haemorrhage has been reported to be the same or less in diabetic than in non-diabetic patients.90 98

    Infections

    Diabetic patients probably have an increased susceptibility to infection, related in part to compromised phagocytic function.99 In diabetic patients with unexplained acute or subacute cerebral or spinal cord symptomatology, the possibility of meningitis or cerebral or epidural abscess should be considered. Thus in a series of 43 cases of bacterial spinal epidural abscesses reported by Darouiche et al,100 eight had diabetes, representing the single most frequent predisposing cause. This was even more evident in the series of 41 patients documented by Khanna et al 101 of whom 22 (53.7%) had diabetes. Enterococcal meningitis may develop in ketoacidotic patients, usually related to septicaemia from Enterococcus faecalis, which is a normal commensal organism in the gut. Diagnosis can be difficult as signs of meningism may be lacking. Two examples of infections that may affect the nervous system are particularly characteristic of diabetes: mucormycosis, and malignant external otitis.

    Rhinocerebral mucormycosis (invasive zygomycosis)102 is caused by zygomycete mucor-like fungi which are common airborne moulds that grow on decaying vegetable matter.102 Diabetic ketoacidosis is a predisposing condition for infection when the fungus invades the paranasal sinuses. The patients are febrile and present with facial pain, swelling, nasal obstruction, and proptosis. The fungi tend to invade blood vessels, leading to thrombosis. Involvement of the orbit may lead to blindness and intracranial extension to invasion of the brain.103 The diagnosis is best made histologically on biopsy specimens. This is a serious condition with a high mortality. Treatment is by surgical debridement together with intravenous and sometimes local instillation of amphotericin B.

    type 1 vs type 2 diabetes eye exam young (🔥 genetic link) | type 1 vs type 2 diabetes eye exam diet plan exampleshow to type 1 vs type 2 diabetes eye exam for Malignant external otitis is also a serious infection,104 105 usually encountered in poorly controlled diabetic patients who develop otalgia. Infection is usually with Pseudomonas aeruginosa and can follow syringing of the external auditory meatus. Mastoiditis and intracranial extension may occur leading to multiple cranial nerve palsies, sinus thrombosis, or meningitis. Treatment is with antipseudomonal agents together with surgical intervention if required.

    Congenital malformations of the nervous system

    Congenital malformations occur in 3%-8% of all births to diabetic women, representing a 2–4-fold increase over non-diabetic mothers.106-108 In the series from Birmingham, United Kingdom reported by Soler et al,106 2.1% had neurological abnormalities compared with an expected rate of 0.65%. The malformations included anencephaly, microcephaly, hydrocephalus, encephalocele, cerebral diplegia, Dandy-Walker syndrome, Arnold-Chiari malformation, spina bifida, and sacral agenesis. Anencephaly and spina bifida were the commonest, occurring in 0.57% (a 3-fold increase) and 0.56% (a 2-fold increase) respectively. Milunskyet al 109 found neural tube abnormalities in 19.5/1000 children of diabetic women compared with 1–2/1000 in the general population. The caudal regression syndrome (sacral agenesis, phocomelic diabetic embryopathy),110 although rare, is particularly associated with maternal diabetes, occurring in 0.2%-0.5% of pregnancies, representing a 200-fold increase over the rate in the general population.111 It is probably the result of a defect in the midposterior axis mesoderm of the embryo before the fourth week of gestation, leading to absence or hypoplasia of caudal structures.

    The precise mechanism of diabetic embryopathy is not established. Hyperglycaemia may act to produce a teratogenic insult in early pregnancy. Insulin does not appear to be directly teratogenic. Genetic factors may be important. In an experimental study on teratogenesis in diabetic rats, the rate of malformations differed markedly between strains of rat.112 Congenital malformations in infants of diabetic mothers can be prevented if tight control of diabetes is established before conception: to achieve this for most diabetic women sound arrangements for prepregnancy counselling need to be established.113

    Summary

    Diabetes mellitus is subdivisible into type 1 insulin dependent and type 2 non-insulin dependent forms. It may be encountered in genetic syndromes that include neurological involvement, the most common of which are mitochondial disorders, Friedreich’s ataxia, and the Wolfram syndrome. Diabetes is responsible for a wide range of neurological manifestations. These can be the direct result of the metabolic disorder or its treatment, or they can represent secondary manifestations. Conditions that result directly from the diabetic state can reflect acute metabolic decompensation, as in diabetic ketoacidosis encountered in type 1 cases and in which diffuse cerebral oedema, especially frequent in children, is an important complication. Hyperosmolar non-ketotic coma is usually seen in type 2 cases. The salient consequences of hypoglycaemia, found as a complication of treatment with insulin or sulphonylurea drugs, are neurological. Late secondary manifestations are a major problem in diabetes. As they affect the nervous system, the most important are peripheral neuropathy and cerebrovascular disease. There is no single diabetic neuropathy but a range of syndromes of which a distal predominant sensory polyneuropathy is frequent. Sensory polyneuropathy the most important risk factor for chronic foot ulceration. Severe autonomic neuropathy is uncommon and is usually encountered in type 1 cases. Focal and multifocal neuropathies comprise isolated cranial and limb neuropathies, truncal radiculoneuropathies and proximal lower limb neuropathy (diabetic amyotrophy). Some of the focal neuropathies are the consequence of an abnormal susceptibility of diabetic nerve to external compression or entrapment. Both transient ischaemic attacks and stroke are commoner in diabetic patients than in non-diabetic subjects, reflecting the increased risk of macrovascular disease in diabetes. Infections are probably more common in diabetic patients but certain types, in particular rhinocerebral mucormycosis and malignant external otitis, are especially characteristic. Finally, congenital malformations, including those affecting the nervous system, are more common in diabetic pregnancies, anencephaly and spina bifida being the most frequent.

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