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

In the context of peripheral vascular disease, the clinical history provides a means of evaluating coronary risk. The key features are: age, previous myocardial infarction especially when recent (under 6 months), anginal pain, smoking, diabetes and ventricular arrhythmias. Treadmill testing, often limited by symptoms of claudication, may reveal severe coronary ischemia and thereby the patients at very high risk. Upper limb exercise stress testing gives results similar to standard protocols of non-atherosclerotic patients when correctly performed and a reliable detection and evaluation of coronary lesions. Thallium dipyridamol myocardial scintigraphy is a very useful diagnostic method but requires special radionuclide facilities. This technique demonstrates the site of ischemia. Coronary angiography should be reserved for special cases because the risks of the procedure are always greater in patients with peripheral vascular disease.
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PMID:[Which coronary investigation should be performed in patients with peripheral arterial diseases?]. 176 87

Ultrastructural, immunohistochemical, and biochemical studies to date show that the fibroblast in Dupuytren's contracture is identical to palmar fascia fibroblasts in patients unaffected by Dupuytren's contracture, and to all other fibroblasts. The major difference relating to fibroblasts is that in Dupuytren's contracture there are more of them, and they are clustered around narrowed microvessels. It is probable that these two phenomena are linked because recent studies indicate a greater potential for ischemia-induced oxygen free radical generation in Dupuytren's contracture, and because oxygen free radicals in these concentrations can stimulate fibroblast proliferation. The major source of oxygen free radicals is likely to be from microvascular endothelial xanthine oxidase-catalyzed reactions. These observations also account for many of the epidemiologic associations of Dupuytren's contracture, because (1) age, race, and diabetes are associated with microvessel narrowing and (2) age, diabetes, alcohol consumption, HIV infection, cigarette smoking, and trauma are associated with increased free radical generation. Nonsteroidal anti-inflammatory drugs and allopurinol are two agents that decrease oxygen free radical release and may inhibit or prevent Dupuytren's contracture.
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PMID:The role of the fibroblast in Dupuytren's contracture. 176 89

From January 1985 to december 1989, 83 patients (69 men, 14 women) underwent an in situ femoro-popliteal bypass using a semi-closed technique and the valvulotome developed by Dr Paul Cartier. Most patients (67%) were operated for severe ischemia while 33% were for claudication. HTA was present in 31% of patients, diabetes in 38% and CAD in 57%. Mean preoperative ABI was 0.33 +/- 0.20 and mean ankle pressure was 50 +/- 30 mm of Hg. Arteriographic popliteal run-off showed three vessels in 21 cases (25%), two vessels in 17 cases (20%) and one vessel in 38 cases (45%). Nine patients (10%) presented an isolated popliteal artery. Bypass was constructed below knee in 62 patients (73%) and above knee in 23 (27%). Five mortalities (5.8%) and two major complications (2.3%) were related to surgery. Four early graft failures (4.4%) were noted but 3 were successfully reoperated. Postoperative ABI was 0.71 +/- 0.23 mm of Hg and 81% of patients had complete relief of their symptoms. With a mean follow-up 19 months, graft patency was 91% +/- 6% and 84% +/- 11% at one and two years and was not influenced by operative indication: hypertension, diabetes, preoperative ABI, arteriographic findings or distal anastomotic site. Overall survival was 80% +/- 10% and 69 +/- 13 at one and two years. The in situ technique using the Cartier valvulotomes is an excellent operation and compares favourably with other techniques.
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PMID:[In situ femoro-popliteal bypass grafts. Study of 85 cases using Cartier's technique]. 178 15

Free radicals have recently been proposed to play a role in the development of diabetic retinopathy. Ischaemia and hyperglycaemia followed by recirculation have been suggested to initiate free radical production in other tissues and the aim of the present study was to examine whether this could also be the case in the retina. The present study showed retinal cell damage, as measured by pycnotic cells, to be more pronounced when ischaemia was combined with hyperglycaemia than when combined with normoglycaemia. As an indication of free radical production, catalase activity was measured, reflecting the production of hydrogen peroxide (H2O2). Small amounts of H2O2 were found to be generated in the normal retina, but did not increase during ischaemia and hyperglycaemia followed by recirculation. It thus seems, as if hyperglycaemia aggravates the harmful effects of ischaemia, but with the methods used, there does not seem to be any increase in free radical production (as measured by H2O2 production) in normal rat retina during ischaemic and hyperglycaemic conditions.
Diabetes Res 1991 Jan
PMID:Hydrogen peroxide production in ischaemic retina: influence of hyperglycaemia and postischaemic oxygen tension. 181 95

The prevalence of extracranial carotid stenosis in patients with a clinical syndrome of lacunar stroke has not been extensively studied using noninvasive methods. We performed carotid duplex sonography on 168 patients referred to the neurosonology laboratory with a diagnosis of ischemic stroke. Strokes were independently classified as lacunar or nonlacunar hemispheric infarction without knowledge of the ultrasound results. We excluded patients with infarcts that were clearly vertebrobasilar, presumed to be cardioembolic, or had occurred greater than 1 year earlier, and patients for whom classification of the nature and location of the event was not possible. Fifty-five patients had lacunar and 54 had nonlacunar stroke. No differences in age, sex, distribution, or prevalence of hypertension, diabetes, prior ischemia, or Hispanic surname existed between the two groups. Tobacco use was more frequent in the nonlacunar group (p less than 0.01). The prevalence of important extracranial carotid stenosis (greater than or equal to 50% diameter reduction) in the lacunar stroke group was 13% (seven of 55) in the ipsilateral and 4% (two of 55) in the contralateral carotid artery. Of the 54 patients with nonlacunar hemispheric stroke, 41% (22) had ipsilateral (p less than 0.01) and 26% (14) had contralateral (p less than 0.01) carotid stenosis. This study suggests that important carotid stenosis is infrequent among patients presenting with a clinical syndrome of lacunar stroke. These data impact on decisions regarding cerebrovascular work-up in such patients.
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PMID:Carotid stenosis in lacunar stroke. 154 12

As part of our initial evaluation to determine whether patients with lower extremity ischemia are candidates for intervention, arterial duplex examinations are performed in the noninvasive vascular laboratory. Patients with isolated short stenoses on the duplex examination are referred for transluminal angioplasty. One hundred thirty-four arteriograms were performed for ischemic peripheral vascular disease in 122 patients between July 1987 and March 1990. One hundred ten (82%) of the arteriograms were preceded by a lower extremity arterial duplex evaluation. Fifty cases (45%) were scheduled for transluminal angioplasty based on the findings of the duplex examination. Transluminal angioplasty was performed in 47 of 50 cases (94%). No significant differences in age, sex, or diabetes were found between the patients who were referred for transluminal angioplasty and those who were not. These data demonstrate that duplex scanning of the lower extremities allows the detection of lesions that will be amenable to transluminal angioplasty. We think that duplex scanning should become the standard screening tool for detection of treatable lower extremity lesions.
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PMID:The role of duplex scanning in the selection of patients for transluminal angioplasty. 182 89

Duplex scanning and Doppler-derived blood pressure measurements were used to serially monitor lower limb hemodynamics in 73 patients who underwent percutaneous transluminal angioplasty. Ninety percutaneous transluminal angioplasty sites judged technically satisfactory by arteriography were evaluated. Significant hemodynamic improvement was seen in 81 (90%) of the 90 limbs, although both hemodynamic and clinical improvement were achieved in only 77 (86%) limbs. Duplex scanning within 1 week of successful angioplasty identified moderate (20% to 49% diameter reduction) or severe (greater than 50% diameter reduction) residual stenosis in 49 (63%) of 77 balloon-dilated arterial segments. The presence of a greater than 50% diameter reduction residual stenosis predicted further restenosis and late clinical failure (11% success rate at 1 year). When the degree of residual stenosis at the percutaneous transluminal angioplasty site was less than 50% diameter reduction by duplex scanning, the procedure was durable (80% success rate at 2 years), even in patients with critical ischemia, poor runoff, or diabetes mellitus.
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PMID:Monitoring functional patency of percutaneous transluminal angioplasty. 182 44

Hip disarticulation, especially in patients with peripheral vascular disease, has been associated with high morbidity and mortality rates. This report describes patient characteristics that influence the clinical outcome of hip disarticulation. The medical records of all patients undergoing hip disarticulation from 1966 to 1989 were reviewed for surgical indication, perioperative wound complications, and postoperative deaths. Fifty-three patients underwent hip disarticulation for limb ischemia (10), infection (12), infection and ischemia (14), or tumor (17). The overall incidence of wound complications was 60%, and no significant differences were found among the groups. Prior above-knee amputation and urgent/emergent operations were significantly associated with increased wound complications (p less than 0.05). The overall mortality rate was 21%, ranging from 0% (tumor) to 50% (ischemia) and differed significantly among the groups (p less than 0.02). Mortality was significantly associated with urgent/emergent operations (p less than 0.01). Age, diabetes mellitus, and previous inflow procedures did not influence mortality rates. The presence of limb ischemia influenced mortality rates to a greater extent than did infection, and a history of cardiac disease was statistically predictive of death. Wound complications frequently accompanied hip disarticulation, regardless of operative indication, and were significantly increased by urgent/emergent operations and prior above-knee amputation. Hip disarticulation can be performed with low mortality rates in selected patients. Both limb ischemia and infection substantially increase operative mortality rates.
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PMID:Hip disarticulation: factors affecting outcome. 188 Aug 49

To evaluate the significance of ischemic ST depression without anginal chest pain during exercise testing among patients with diabetes mellitus, the data on 45 such patients from the Coronary Artery Surgery Study registry were analyzed. These patients (group 1, silent ischemia) were compared with 37 diabetic patients with both ischemic ST depression and chest pain (group 2, symptomatic ischemia), with 31 diabetic patients without ischemic ST depression or chest pain (group 3, no ischemia), and with 429 patients without diabetes who had silent ischemia during exercise testing. All patients had documented coronary artery disease (CAD) (greater than 70% diameter narrowing). The 6-year survival among patients with silent ischemia was worse in diabetic than nondiabetic patients (59 vs 82%, respectively, p less than 0.001). By contrast, the 6-year survival among patients without ischemia was similar among diabetic and nondiabetic patients (93 vs 85%, respectively, p = 0.476). Among diabetic patients, survival at 6 years with medical treatment was 59% for group 1, 66% for group 2 and 93% for group 3 (p = 0.008). Survival among subsets of patients with diabetes and silent ischemia (group 1) based on the extent of CAD and left ventricular function ranged from 100 to 32% (p = 0.093). The survival of the 45 patients with diabetes mellitus and silent ischemia (group 1) treated medically was compared with that of 28 patients receiving coronary artery graft bypass surgery.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Significance of silent myocardial ischemia during exercise testing in patients with diabetes mellitus: a report from the Coronary Artery Surgery Study (CASS) Registry. 189 78

Eighty-eight patients undergoing percutaneous transluminal coronary angioplasty (PTCA) of 100 stenoses were studied for the presence of factors deemed significant in the etiology of silent myocardial ischemia. Thirty-two patients were asymptomatic during balloon dilations of 36 arteries, and 56 patients had angina during PTCA of 64 arteries. There were no differences in age, sex, prior anginal history, antianginal regimen, extent of coronary artery disease and number or duration of inflations between the 2 study groups. Previous infarction (33 vs 12%, p less than 0.02), Q waves in the target area (31 vs 7%, p less than 0.005) and diabetes mellitus (36 vs 17%, p less than 0.05) were present more often in the asymptomatic group. Sixty-four% of all asymptomatic patients had either diabetes or previous infarction in the target territory. Collateral circulation was more frequent in asymptomatic patients, probably reflecting the ability of collateral arteries to ameliorate ischemia. During 2-vessel PTCA, patients without angina during dilation of only 1 of the 2 treated arteries (discordant responders) had previous infarction in that artery's territory (5 of 5, 100%), whereas patients without previous infarction were either symptomatic or asymptomatic (concordant responders) during PTCA of both arteries. This study shows that asymptomatic ischemia occurs frequently during PTCA in patients with symptomatic coronary disease. Prior Q-wave infarction and diabetes mellitus are important, independent factors associated with painless ischemia. It is suggested that infarction produces a localized dysfunction of afferent cardiac pain fibers, whereas diabetes can cause a global cardiac sensory neuropathy.
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PMID:Asymptomatic myocardial ischemia during percutaneous transluminal coronary angioplasty and importance of prior Q-wave infarction and diabetes mellitus. 189 79


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