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Query: UMLS:C0011849 (diabetes)
 277,896 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

We previously reported the presence of endoneurial hypoxia, ischemia, impairment of the blood-nerve barrier, and reduction of norepinephrine and 6-ketoprostaglandin F1 alpha in chronic streptozocin-induced diabetic neuropathy (SDN) and interpreted these findings as suggesting the involvement of oxygen free radicals (OFRs) but did not directly measure indices of OFR activity. In this study, we report on sciatic nerve conjugated dienes, hydroperoxides, norepinephrine, and malondialdehyde in SDN at 1, 4, and 12 mo in male Sprague-Dawley rats. Severe hyperglycemia was present throughout in diabetic rats. Conjugated dienes were consistently increased at all time points, hydroperoxides were consistently reduced, and malondialdehyde was not significantly different in diabetes compared with controls. These findings are consistent with increased OFR activity in experimental diabetes. It is necessary to monitor several indices of OFR activity in a metabolically active tissue such as the peripheral nerve.
Diabetes 1991 Jul
PMID:Oxygen free radical effects in sciatic nerve in experimental diabetes. 206 Jul 23

Since advanced glycosylation end products have been suggested to mediate hyperglycemia-induced microvascular atherogenesis and because aminoguanidine (AG) prevents their generation, we examined whether AG could prevent or ameliorate the physiologic and biochemical indices of streptozotocin (STZ)-induced experimental diabetic neuropathy. Four groups of adult Sprague-Dawley rats were studied: group I received STZ plus AG (25 mg.kg-1.day-1), group II received STZ plus AG (50 mg.kg-1.day-1), group III received STZ alone, and group IV was a control. We monitored conduction and action potential amplitudes serially in sciatic-tibial and caudal nerves, nerve blood flow, oxygen free radical activity (conjugated dienes and hydroperoxides), and the product of the permeability coefficient and surface area to 125I-labeled albumin. STZ-induced diabetes (group III) caused a 57% reduction in nerve blood flow and in abnormal nerve conduction and amplitudes and a 60% increase in conjugated dienes. Nerve blood flow was normalized by 8 weeks with AG (groups I and II) and conduction was significantly improved, in a dose-dependent manner, by 16 and 24 weeks in sciatic-tibial and caudal nerves, respectively. The permeability coefficient was not impaired, suggesting a normal blood-nerve barrier function for albumin, and the oxygen free-radical indices were not ameliorated by AG. We suggest that AG reverses nerve ischemia and more gradually improves their electrophysiology by an action on nerve microvessels. AG may have potential in the treatment of diabetic neuropathy.
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PMID:Aminoguanidine effects on nerve blood flow, vascular permeability, electrophysiology, and oxygen free radicals. 206 89

We studied the lipidic metabolism and the atherogenic risk factors non related to lipidic metabolism in two groups of patients: group 1 with only coronary disease and group 2 with coronary disease and atherosclerosis in the cerebral and/or peripheric artery territories. Patients of group 2 showed a cholesterol, cLDL, and B-apoprotein titers significantly higher than group 1. Systolic and diastolic blood pressure were higher in group two. Also the incidence of diabetes mellitus in group 2 was higher than in group 1. In a stepwise discriminating analysis the diastolic arterial pressure and cholesterol titers were the parameters with a greatest predictive potential for the presence of localized or generalized ischemic disease. B-apoprotein was the lipidic parameter with the greatest predictive potential. All together these data suggest that in coronary patients, a discrete increase in plasma cholesterol can imply a risk of suffering ischemia in some other arterial territories. Diastolic blood pressure, cholesterol and diabetes mellitus are the factors with the highest predictive potential for the generalization of arteriosclerosis.
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PMID:[Factors associated with generalized forms of arteriosclerosis in patients with coronary disease]. 209 Nov 13

Ischemia plays an important role in the development of neuropathies associated with various disorders, such as peripheral vascular occlusive diseases, necrotizing vasculitides, diabetes mellitus and nerve compression or trauma. Although a multiple mononeuropathy or an asymmetrical polyneuropathy is the usual clinical presentation of ischemic neuropathy, some patients present with a neuropathy that is mainly distal and symmetrical. Pathologically, nerve ischemia results in focal or multifocal central fascicular or sector fiber degeneration. These ischemic lesions tend to begin at mid-upper arm or midthigh level, which is the watershed zone of poor perfusion, and become more diffuse distally. Nerve ischemia at the level of distal small fascicles often induces sub-perineurial crescent lesion rather than central fascicular fiber degeneration. Physiologically, reduced nerve blood flow with endoneurial hypoxia has been demonstrated in experimental diabetic and galactose neuropathies. Endoneurial ischemia/hypoxia in galactose neuropathy appears to be due to increased intercapillary distances and constriction of trans-perineurial vessels resulting from endoneurial edema. Although acute ischemic neuropathy has been well investigated, little is known about functional or structural responses of peripheral nerve to chronic ischemia.
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PMID:[Ischemic neuropathy]. 209 82

To elucidate the prevalence and features of painless myocardial ischemia among diabetic patients, 44 consecutive patients with angiographically-documented coronary artery disease and positive treadmill tests were examined. They were 26 with diabetes and 18 without it. Painless myocardial ischemia was defined as the absence of chest pain with 1 mm or more ST segment depression during the exercise stress tests. The severity of ischemia was determined by the magnitude of the ST segment depression. Painless myocardial ischemia was observed in 18 of the 26 (69%) diabetics, and in three of the 18 (17%) non-diabetics (p less than 0.005). The frequency of painless ischemia in the diabetics was relatively high regardless of the severity of ischemia, while painless ischemia was less frequent in the non-diabetics with severe ischemia. With a level of 2.5 mm ST depression, 11 of 12 (92%) diabetics were free of pain compared to four of 11 (36%) non-diabetics (p less than 0.01). Absence of chest pain during the exercise tests was not concordant with prior angina in diabetics, as opposed to non-diabetics in whom both clinical and exercise-induced angina developed concordantly. The diabetic patients without chest pain had a higher prevalence of three major diabetic complications such as neuropathy, nephropathy and retinopathy compared to those developing chest pain (p less than 0.025). It was concluded that in diabetics, painless myocardial ischemia is frequently observed during exercise stress tests and its prevalence is relatively high regardless of the severity of ischemia.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:[Painless myocardial ischemia in diabetic patients with coronary artery disease: evaluations by treadmill exercise tests]. 210 4

In 50 subjects with arteriosclerotic ischaemia of the lower extremities and 41 subjects with diabetes mellitus ozone was applied intra-arterially. Before and after the treatment serum lipids concentration was examined. In the group with arteriosclerotic ischemia significant decrease in cholesterol level and both his fractions was seen. Whereas in the group with diabetes the cholesterol LDL was significantly reduced. In both groups total lipids level serum was decreased. It suggests that ++ozone therapy set back the arteriosclerosis progress, normalized some parameters of lipid metabolism and improved HDL to LDL cholesterol fractions relationship.
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PMID:[Various parameters of lipid metabolism after intra-arterial injections of ozone in patients with ischemia of the lower extremities and diabetes mellitus]. 210 39

Isovolumically perfused control and chronic diabetic rat hearts were subjected to 20 min of global ischemia plus 30 min of reperfusion at preischemic flow rates. Recoveries of contractile function during reperfusion were similar in both groups. Addition of arachidonic acid produced profound postischemic dysfunction in nondiabetic hearts (isovolumic minute work = 19 +/- 8 vs. 86 +/- 10% of preischemic levels after 30 min), whereas arachidonic acid had no detrimental effect in diabetic hearts. Arachidonic acid also augmented endogenous prostacyclin release in control hearts (untreated 2.28 +/- 0.23 ng/ml; arachidonic acid 4.07 +/- 0.22 ng/ml) but failed to alter postischemic prostacyclin release in diabetic hearts. The arachidonic acid-induced postischemic dysfunction was significantly attenuated by coadministration of the oxygen free radical scavengers, superoxide dismutase plus catalase, but not by indomethacin. Thus arachidonic acid-induced dysfunction in normal hearts appears to be related, in part, to free radical production. The intrinsic capacity of the heart to synthesize prostacyclin as a result of ischemia and reperfusion does not appear to be impaired by diabetes. In contrast, the arachidonic acid-induced increase in prostacyclin following ischemia is blunted in the diabetic heart. Although chronic diabetic hearts showed increased tolerance to arachidonic acid-induced dysfunction during reperfusion, a defect in prostacyclin stimulation may place the diabetic at greater risk of complications of ischemic reperfusion in vivo by reducing the capacity to adequately respond to the aggregatory and vasospastic actions of increased circulating thromboxane consequent to myocardial ischemia and reperfusion.
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PMID:Arachidonic acid causes postischemic dysfunction in control but not diabetic hearts. 210 41

This study describes a procedure for large scale isolation of swine islets. The reported results are from 15 consecutive isolations. The glands were removed from live animals with no warm ischemia, and the pancreata were digested by a modification of the automated method for human islet isolation. It was possible to separate an average of 690,000 +/- 279,429 islets per pancreas corresponding to 10,360 +/- 4034 islets per gram of pancreas with a volume of 714 +/- 480 mm3. After purification the recovery was 255,000 +/- 32,407 islets corresponding to 4,000 +/- 567 islets per gram of pancreas. Purity of the final preparation was 80% to 95% islets. Insulin content resulted in an average of 146.8 +/- 78 U before purification and 71 +/- 53 U after purification. After a 10 mm3 aliquot of the final preparation was transplanted under the renal subcapsular space of seven nude mice with diabetes, normoglycemia occurred in six of the mice. Thirty days after transplantation, nephrectomy of the kidneys bearing the grafts produced a rapid return to the diabetic state in all cases. This method makes it possible to provide large numbers of intact swine islets for preliminary studies of prevention of the rejection of pig islet xenograft by immunoalteration and immunoisolation procedures.
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PMID:Isolation of the elusive pig islet. 211 87

The authors carried out a prospective study to determine the frequency of silent ischemia (SI) in 50 consecutive patients with end stage renal failure during dialysis by Holter monitoring. Twenty patients had SI (40%). This event was related to the number of cardiovascular risk factors (p = 0.0025), principally diabetes, smoking and the underlying renal disease (p = 0.018), and to a history of coronary artery disease (p = 0.0015). Two patients died during the nine months follow-up period and both had SI on Holter monitoring. Dialysis therapy in anaemic patients may predispose to and facilitate the detection of myocardial ischemia by the simultaneous interplay of hypotension, hypovolemia, hypoxia and tachycardia. The detection of these ischemic events may allow identification of a subgroup of dialysis patients with a high cardiovascular risk. The prognosis of these patients and best therapeutic approach require further study.
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PMID:[Frequency of painless myocardial ischemia during hemodialysis in 50 patients with chronic kidney failure]. 212 44

The severity of necrotic muscle and nerve lesions in the ischemic hind limbs of diabetic and nondiabetic rats was compared. Chronic limb ischemia was induced by repetitive, daily for up to 8 weeks, intraperitoneal injections of serotonin in rats with ligated right femoral artery. Light microscopic examination and lesion severity grading was performed on sections taken from several right hind limb muscles and the right tibial nerve. Overall, muscle was less damaged in diabetic than in nondiabetic rats. However, muscle was damaged more than nerve in all but diabetic rats with severe chronic ischemia. Muscle vulnerability to ischemic damage is decreased in diabetes, presumably due to abundance of glucose and other energy substrates which can be utilized during ischemia.
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PMID:Muscle vulnerability to ischemic damage is decreased in experimental diabetes mellitus. 215 Aug 57


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