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Biomedical subjects

S Behar

Publications and source records attributed to S Behar.

At least 73 records · Page 4Linked to original sources
PubMed1998

A novel recognition site for somatostatin-14 on the GABA(A) receptor complex.

Functional interactions between gamma-aminobutyric acid (GABA) and somatostatin are suggested by the presence of synaptic contacts between GABA and somatostatin neurons, colocalisation of GABA and somatostatin and reciprocal modulation of somatostatin and GABA release. Nevertheless, a direct interaction of somatostatin with the GABA(A) receptor complex has not yet been investigated. A quantitative autoradiographic technique was used to determine the ability of somatostatin to interact with the [35S]t-butylbicyclophosphothionate [35S]TBPS binding sites of the GABA(A) receptor complex: somatostatin inhibited [35S]TBPS binding with IC50 values in the micromolar range in all brain regions studied. These results demonstrate for the first time a direct interaction between somatostatin and the GABA(A) receptor complex.

Animals↗
PubMed1998

Effects of aspirin treatment on survival in non-insulin-dependent diabetic patients with coronary artery disease. Israeli Bezafibrate Infarction Prevention Study Group.

PURPOSE: The benefit of aspirin treatment among diabetic patients with chronic coronary artery disease is not well established. The purpose of this study was to assess the effect of aspirin on cardiac and total mortality in a large cohort of diabetic patients with established coronary artery disease and to compare it with the effect of aspirin in nondiabetic counterparts. PATIENTS AND METHODS: In this observational study among patients screened for participation in the Bezafibrate Infarction Prevention Study, the effects of aspirin treatment in 2,368 non-insulin-dependent diabetic patients with coronary artery disease were compared to those in 8,586 nondiabetic patients. Hazard ratios (HR) and 95% confidence intervals (CI) were estimated with proportional hazards models. RESULTS: Fifty-two percent of diabetic patients and 56% of nondiabetic patients reported aspirin therapy. After 5.1 +/- 1.3 (mean +/- SD) years of follow-up, the absolute benefit per 100 patients treated with aspirin was greater in diabetic patients than in nondiabetic patients (cardiac mortality benefit: 5.0 versus 2.1, and all-cause mortality benefit: 7.8 versus 4.1). Overall cardiac mortality among diabetic patients treated with aspirin was 10.9% versus 15.9% in the nonaspirin group (P < 0.001), and all-cause mortality was 18.4% and 26.2% (P < 0.001). After adjustment for possible confounders, treatment with aspirin was an independent predictor of reduced overall cardiac (HR = 0.8; 95% CI: 0.6-1.0) and all-cause mortality (HR = 0.8; 95% CI: 0.7-0.9) among diabetic patients, similar to those in nondiabetic patients. CONCLUSION: Treatment with aspirin was associated with a significant reduction in cardiac and total mortality among non-insulin-dependent diabetic patients with coronary artery disease. The absolute benefit of aspirin was greater in diabetic patients than in those without diabetes.

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PubMed1998

Nifedipine and cancer mortality: ten-year follow-up of 2607 patients after acute myocardial infarction.

Recent publications contended that the use of short-acting calcium antagonists may double the risk of cancer incidence and possibly increase mortality in hypertensive patients. The purpose of this study was to assess the risk ratio for cancer mortality associated with nifedipine in a large population of patients post-myocardial infarction. Cancer mortality data, over a 10-year period, were obtained on 2607 hospital survivors of acute myocardial infarction who were screened, but not included, in the Secondary Prevention Reinfarction Israeli Nifedipine Trial (SPRINT I) study. In this group of patients, 526 (20%) were on nifedipine, according to their treating physicians' decision. In the cohort of screened patients not included in SPRINT I, there were 22 (4.2%) cancer-related deaths in the patients on nifedipine compared with 114 (5.5%) in the group not treated with nifedipine (P = 0.23). In multivariate analysis, the 10-year cancer mortality risk ratio associated with nifedipine therapy was 1.06 (95% CI 0.52-2.18). The current analysis shows no evidence of an increased risk of cancer mortality in a large number of patients treated at baseline with nifedipine.

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PubMed1998

Long-term mortality follow-up of hospital survivors of a myocardial infarction randomized to nifedipine in the SPRINT study. Secondary Prevention Reinfarction Israeli Nifedipine Trial.

This study was intended to determine the 5-year mortality of 2138 post-myocardial infarction (MI) patients who took part in the Secondary Prevention Reinfarction Israeli Nifedipine Trial (SPRINT). In the framework of the SPRINT study, 1065 patients were randomly assigned 30 mg/d nifedipine therapy, for a mean 10-month follow-up period, and 1073 received placebo. No information is available concerning treatment after the first year. One-year postdischarge mortality was 5.0% in the placebo group and 5.9% among patients receiving nifedipine (P = 0.37). Mortality rates after 5 years of follow-up in patients previously randomized to 1 year of nifedipine therapy and placebo were 18.4% and 18.3%, respectively. The 5-year mortality risk ratio associated with randomization to nifedipine over 1 year, adjusted for age, gender, past MI, angina, diabetes, hypertension, MI location, and therapy, was 1.00 (95% CI: 0.81-1.22). Our results do not support an association between nifedipine therapy and a late harmful effect on long-term mortality.

Adult↗
PubMed1998

Treatment of angina pectoris with calcium antagonists: long-term follow-up.

This study was designed to investigate the association of calcium channel blocker (CCB) use with subsequent mortality in a group of patients with chronic stable angina. CCBs have been proven effective in the treatment of angina pectoris. Recently, the safety of CCBs in hypertensive and coronary artery disease patients has been challenged. New prospective controlled studies with nifedipine are under way that may help define the long-term safety of CCBs in the treatment of these patients. Until these studies are concluded, long-term data on mortality among CCB users may be informative. From 1990 to 1992, 11,575 patients with coronary heart disease were screened but not included in a secondary prevention study with bezafibrate conducted in 18 cardiac departments in Israel. Of these patients, 2390 had chronic angina without a history of myocardial infarction and were followed for subsequent mortality over 4-6 years (mean 5.2 years). From this patient population, 1366 (57%) reported receiving a CCB. They included more women and hypertensives, and a greater proportion of them exhibited a higher severity of anginal class than counterparts not treated with a CCB (n = 1024). The mortality in patients treated with CCBs was similar to those not treated with CCBs (11.5% vs. 11.6%; P = 0.53). A multivariate analysis accounting for differences in age, sex, and other clinical parameters associated with increased risk evaluated the estimated hazard ratio (HR) of death of patients treated with CCBs compared with those not treated with CCBs (HR = 0.89; 95% CI = 0.68-1.16). In Cox regression analysis, the adjusted HR of death of patients treated with nifedipine or diltiazem, together with a beta-blocker, was 0.85 (95% CI = 0.47-1.54) and 0.47 (95% CI = 0.24-0.90), respectively. After a follow-up of 4-6 years (mean 5.2) there was no evidence of increased mortality risk associated with CCB use among coronary heart disease patients with chronic stable angina. However, due to wide confidence intervals and possible confounding factors, randomized control studies are required to provide definitive information.

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PubMed1998

Prognosis of patients with a first non-Q-wave myocardial infarction before and in the reperfusion era. SPRINT and the Israeli Thrombolytic Survey Groups. Secondary Prevention Reinfarction Israeli Nifedipine Trial.

BACKGROUND: The reported incidence of non-Q-wave acute myocardial infarction (AMI) has increased in the thrombolytic era. Data comparing prognosis among these patients before and after the advent of the thrombolytic era are scarce. METHODS: We compared the early and late prognosis among 2 cohorts of consecutive patients with a first non-Q-wave AMI hospitalized in the coronary care units operating in Israel: 610 patients from 1981 to 1983 and 225 patients in 1994. RESULTS: The proportion of patients with non-Q-wave AMI increased from 14% in 1981 to 1983 to 32% in 1994. Baseline characteristics in both periods were comparable. In-hospital management of patients differed during the last decade. Patients in 1994 received aspirin, angiotensin-converting enzyme inhibitors, beta-blockers, and nitrates more frequently than in the period 1981 to 1983. Thrombolytic therapy, coronary angiography, and percutaneous transluminal coronary angioplasty or coronary artery bypass grafting were not used during the index hospitalization in the early 1980s, whereas in 1994 these procedures were used in 28%, 38%, 19%, and 6% of patients, respectively. In-hospital complications, including arrhythmias, conduction disturbances, and heart failure, were less frequent in 1994 compared with the period 1981 to 1983. The 7- and 30-day crude mortality rates were significantly lower in 1994 compared with the early 1980s (5% vs 9% and 5% vs 13%, respectively, P < .05 for both), whereas the 1-year crude mortality rate decreased slightly (15% vs 19%, P = .13). Multivariate analyses adjusting for pertinent variables revealed a decreased risk for death in 1994 versus 1981 to 1983; for 7-day (odds ratio = 0.49, 95% confidence interval 0.23 to 0.94), 30-day (odds ratio = 0.36, 95% confidence interval 0.18 to 0.69) and for 1-year (odds ratio = 0.65, 95% confidence interval 0.44 to 0.96). CONCLUSION: The prognosis of patients with a first non-Q-wave AMI has improved considerably during the last decade. The introduction of new therapeutic modalities, including invasive cardiac procedures and new medications, probably played a major role in the favorable outcome of these patients.

Adult↗
PubMed1998

Symptom-oriented nitrate administration and survival after acute myocardial infarction. Israeli Thrombolytic Survey Group.

The effect of nitrates during evolving myocardial infarction is controversial. While previous studies showed that nitrates improve left ventricular function and have a beneficial effect on survival, two recent randomized megatrials showed that nitrates did not alter mortality after acute myocardial infarction (AMI). The present study analyzes the use of nitrates in clinical practice and their impact on mortality in a cohort of unselected consecutive AMI patients admitted to all 25 coronary care units operating in Israel during 2 months in 1994. Among 966 patients in Killip class I-III on admission, 81% (n = 783) received nitrate therapy by intravenous infusion or orally. Baseline characteristics of patients treated with or without nitrates were quite similar. Seven-day mortality was markedly reduced in the nitrate-treated group (5 and 11 %, p < 0.001) in comparison with those who did not receive nitrates. After adjustment for pertinent variables the 7-day relative risk (RR) of mortality was 0.51 [95% confidence interval (CI) 0.25-1.07; p = 0.08], whereas, the 7-day to 1-year mortality after AMI was not altered by nitrate use (RR = 0.97; 95% CI 0.56-1.68; p = 0.92). Nitrate therapy remains a widespread and a valid symptom-oriented therapeutic approach, especially early after AMI, in the community.

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PubMed1998

Baseline characteristics of patients participating in the Bezafibrate Infarction Prevention (BIP) Study.

Low high density lipoprotein (HDL) cholesterol, elevated triglycerides, or a combination of both, carries an increased risk of coronary heart disease (CHD). The benefit of therapy that increases serum HDL cholesterol concentrations and lowers triglyceride concentrations on the reduced incidence of myocardial infarctions and mortality has not been unequivocally demonstrated in healthy persons or patients with CHD. The Bezafibrate Infarction Prevention (BIP) study randomized men and women, with CHD and with total serum cholesterol 180 - 250 mg. dl-1, low density lipoprotein (LDL) cholesterol < or = 180 mg. dl-1 (< or = 160 mg. dl-1 below age 50 years), HDL cholesterol < or = 45mg. dl-1 and triglycerides < or = 300 mg. dl-1, to bezafibrate retard (400 mg once daily) or placebo. In addition to its effect on the lipids, this drug significantly lower plasma fibrinogen. The demographic, clinical and biochemical characteristics and existing cardiovascular therapy at baseline of 3122 patients randomized onto the study are presented here. A comparison is made with other on-going or recently published secondary prevention studies of lipid modification in CHD patients.

Adult↗
PubMed1997

Incidence and mortality from early stroke associated with acute myocardial infarction in the prethrombolytic and thrombolytic eras. Secondary Prevention Reinfarction Israeli Nifedipine Trial (SPRINT) and Israeli Thrombolytic Survey Groups.

OBJECTIVES: This study sought to compare the incidence of early cerebrovascular events and subsequent mortality in two cohorts of consecutive patients with acute myocardial infarction (AMI), admitted to coronary care units (CCUs) in Israel, in the prethrombolytic and thrombolytic eras. BACKGROUND: During the past decade, substantial changes have occurred in the medical treatment of AMI, and important new therapies have been introduced that could all affect stroke risk and type by diverse mechanisms. Yet the overall impact of these new therapeutic modalities on the incidence of stroke complicating AMI is not clear. METHODS: We compared the incidence and mortality rates of cerebrovascular events complicating AMI within CCUs among 5,839 consecutive patients admitted in the period 1981 to 1983 versus 2,012 patients from two prospective nationwide surveys conducted in all CCUs operating in Israel in 1992 and 1994. RESULTS: The demographic and clinical characteristics of patients with AMI in both periods were comparable. Patients admitted in the period 1981 to 1983 did not receive thrombolysis and reperfusion therapy; those admitted in 1992 and 1994 received thrombolysis (45%) and coronary angioplasty or coronary artery bypass graft surgery (14%), and antiplatelet and anticoagulant treatments were more frequently used. The incidence of early cerebrovascular events was 0.74% (43 of 5,839) in 1981 to 1983 versus 0.75% (15 of 2,012) in the 1992 to 1994 cohort. Patients with an AMI who experienced a cerebrovascular event were somewhat older in both groups and had a high rate of previous cerebrovascular events, congestive heart failure and atrial and ventricular arrhythmias during the hospital period. Mortality declined by one-third between the two periods. However, the mortality rate of patients with AMI who sustained a cerebrovascular event remained high (> or =40% for 30 days, 60% for 1 year). CONCLUSIONS: The overall incidence of early cerebrovascular events complicating AMI remained similar (0.75%) in the prethrombolytic and thrombolytic eras. Mortality rates of patients with an AMI but no cerebrovascular events decreased substantially over the past decade but not in patients with AMI with a cerebrovascular event.

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PubMed1997

Usefulness of the Killip classification for early risk stratification of patients with acute myocardial infarction in the 1990s compared with those treated in the 1980s. Israeli Thrombolytic Survey Group and the Secondary Prevention Reinfarction Israeli Nifedipine Trial (SPRINT) Study Group.

The classification introduced in 1967 by Killip et al has proved to be a useful method for early risk stratification of patients with acute myocardial infarction (AMI). Over the past 3 decades the overall mortality due to AMI has decreased significantly. The present study evaluates the usefulness of the Killip classification as a method for early risk stratification of patients with AMI in the 1990s. One thousand eight hundred seventy-three consecutive AMI patients were hospitalized in 25 coronary care units operating in Israel, and were followed for 1 year. Higher Killip class was found to be associated with increased in-hospital and 1-year mortality, in thrombolysis- and nonthrombolysis-treated patients (30-day mortality for all patients was 5%, 21%, 35%, and 67% in Killip classes I to IV, respectively). The overall mortality among AMI patients in the 1990s was found to be lower for each Killip class compared with a comparable patient population with AMI, hospitalized in Israel in the 1980s. Thus, the Killip classification is a useful method for early risk stratification of AMI patients in the 1990s.

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PubMed1997

Long-term prognosis of women after myocardial infarction. SPRINT Study Group. Secondary Prevention Reinfarction Israeli Nifedipine Trial.

Women sustaining myocardial infarction fare worse than men during hospitalization. Reports on long-term survival in women surviving an acute myocardial infarction are controversial. The Secondary Prevention Reinfarction Israeli Nifedipine Trial (SPRINT) registry includes 5,839 consecutive myocardial infarction patients who were hospitalized in 13 coronary care units in Israel between 1981 and 1983. The authors examined sex differences in the long-term survival of 4,808 hospital survivors (1,120 women and 3,688 men). Women exhibited a significantly poorer long-term survival than men. After age adjustment, differences between men and women decreased, leaving a survival probability difference of 11% at the end of 12 years of follow-up. In a subgroup analysis, women exhibited poorer survival than men in a comparison of patients with and without periinfarction congestive heart failure or a history of myocardial infarction preceding the index infarction. The multivariate adjusted hazard ratios associated with female sex in diabetic and nondiabetic patients were 1.46 and 1.13, respectively. In conclusion, a cumulative survival disadvantage for women in comparison with men is still evident after 12 years of follow-up. The mortality difference is diminished but not erased after age adjustment or multivariate adjustment for confounders. The authors' results are compatible with a hypothesis that the main factor underlying the increased long-term mortality in women after myocardial infarction, besides older age, is diabetes mellitus.

Age Distribution↗
PubMed1997

Comparison of short- and long-term prognosis in patients with anterior wall versus inferior or lateral wall non-Q-wave acute myocardial infarction. Secondary Prevention Reinfarction Israeli Nifedipine Trial (SPRINT) Study Group.

We evaluated the early and long-term prognosis of patients with a first non-Q-wave acute myocardial infarction (AMI) in relation to infarct site. Among 4,314 patients with a first AMI, 610 (14%) had a non-Q-wave AMI. Of them, 248 patients with anterior wall AMI were compared with 327 patients with inferior/lateral AMI. Baseline clinical characteristics were similar in both groups except for higher mean age in the anterior wall group. In-hospital complications were more common among patients with anterior wall AMI than in the inferior/lateral group. Patients with anterior wall AMI also had higher rates of in-hospital (15%), 1-year (12%), and 5-year (36%) postdischarge mortality compared with the inferior/lateral infarction group (10%, 6%, and 22%, respectively). The 1-year cardiac event rate (recurrent AMI and cardiac death) was significantly higher among the anterior wall AMI group than the inferior/lateral AMI group (14.2% and 4.8% respectively, p = 0.001). After adjustment for age, gender, systemic hypertension, diabetes mellitus, prior angina, and treatment with various medications, an increased risk for 1-year (odds ratio 1.31, 95% confidence interval [CI] 0.62 to 2.78) and 5-year mortality (relative risk 1.29, 95% CI 0.90 to 1.85) was observed, but it did not reach statistical significance. Anterior wall AMI location emerged as a predictor for higher 1-year cardiac event rate (odds ratio 3.15, 95% CI 1.59 to 6.78). These findings suggest that AMI location is an important prognostic variable for risk stratification of patients with a first non-Q-wave AMI.

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PubMed1997

Frequency and prognostic significance of high-degree atrioventricular block in patients with a first non-Q-wave acute myocardial infarction. The SPRINT Study Group. Second Prevention Reinfarction Israeli Nifedipine Trial.

Patients with a first non-Q-wave acute myocardial infarction with high-degree atrioventricular block were compared with patients without atrioventricular block. In-hospital complications and mortality were significantly higher among patients with atrioventricular block; atrioventricular block emerged as an important prognostic predictor of early mortality in these patients.

Age Factors↗
PubMed1997

Improved outcome of elderly patients (> or = 75 years of age) with acute myocardial infarction from 1981-1983 to 1992-1994 in Israel. The SPRINT and Thrombolytic Survey Groups. Secondary Prevention Reinfarction Israel Nifedipine Trial.

BACKGROUND: The number of elderly patients experiencing acute myocardial infarction (AMI) is growing rapidly, and their hospital mortality rate remains high, although mortality after AMI declined in the 1990s with the introduction of new therapeutic modalities. METHODS AND RESULTS: We compared the management, in-hospital complications, and 30-day and 1-year mortality rates in two cohorts of elderly (> or = 75 years of age) AMI patients in the coronary care units in Israel before and after the reperfusion era. The first cohort of 789 consecutive patients was from the Secondary Prevention Reinfarction Israel Nifedipine Trial registry in 1981-1983; the second 366 patients came from two prospective nationwide surveys in 1992 and 1994. Reperfusion therapies were not used in 1981-1983 but were used in 1992-1994. The 30-day mortality rate declined from 38% in 1981-1983 to 27% in 1992-1994 (odds ratio, 0.49; 95% confidence interval [CI], 0.34 to 0.71), and the cumulative 1-year mortality rate declined from 52% to 38% (hazard ratio [HR], 0.62; 95% CI, 0.50 to 0.76). In the 1992-1994 cohort, the decline in mortality was most marked in patients reperfused by thrombolysis and/or percutaneous transluminal coronary angioplasty or coronary artery bypass graft surgery but was also evident in nonreperfused patients: cumulative 1-year mortality rate was 29% in the former (HR, 0.45; 95% CI, 0.31 to 0.67) and 42% in the latter (HR, 0.60; 95% CI, 0.46 to 0.78). CONCLUSIONS: During the last decade, elderly (> or = 75 years) AMI patients experienced fewer in-hospital complications and lower 30-day and 1-year mortality rates, which declined approximately 30%, most markedly in reperfused patients. The favorable outcome in 1992-1994 was related to changes in patient management. Reperfusion therapy is therefore also advocated in elderly AMI patients, unless specific contraindications are present.

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PubMed1997

Ten-year survival after acute myocardial infarction: comparison of patients with and without diabetes. SPRINT Study Group. Secondary Prevention Reinfarction Israeli Nifedipine Trial.

In a prospective study among 5839 consecutive patients after acute myocardial infarction (AMI), the prognosis of men and women with diabetes was compared with that of patients without diabetes after AMI. The prevalence of insulin-treated diabetes or diabetes treated with oral hypoglycemic drugs was 2% and 8% among men and 6% and 12% among women respectively. After multiple regression analysis, the odds ratio for in-hospital mortality was 1.26 (95% confidence interval [CI] 0.82 to 1.92) for non-insulin-treated men with diabetes and 2.24 (95% CI 1.14 to 4.38) for those treated with insulin. Among women, these odds ratios were 1.46 (95% CI 0.90 to 2.36) and 1.80 (0.93 to 3.51), respectively. The 10-year relative risk for death was 1.32 (95% CI 1.10 to 1.58) for men with non-insulin-treated diabetes and 1.75 (95% CI 1.26 to 2.45) for men treated with insulin. For women, the respective relative risks for 10-year mortality were 1.41 (95% CI 1.10 to 1.82) for those treated with oral hypoglycemic drugs and 2.59 (95% CI 1.89 to 3.56) for diabetic women treated with insulin. We conclude that (1) diabetes requiring treatment emerged as an independent predictor of short- and longterm mortality after AMI; (2) diabetic women had a worse long-term prognosis than diabetic men after AMI; and (3) diabetic patients treated with insulin had the worst short- and long-term prognosis after AMI in both genders.

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PubMed1997

Low total cholesterol is associated with high total mortality in patients with coronary heart disease. The Bezafibrate Infarction Prevention (BIP) Study Group.

The present non-intervention screening study was undertaken to explore the relationships between pre-existing low total cholesterol and all-cause mortality. Eleven thousand, five hundred and sixty-three patients with coronary heart disease who attended a screening visit but were not included in the Bezafibrate Infarction Prevention study were followed-up for a mean of 3.3 years after determination of baseline total cholesterol. Five hundred and ninety-five (5%) of this largely unselected population who had total cholesterol levels < or = 160 mg.dl-1 formed the study population. The remaining 10968 patients acted as controls. The relative risk of all-cause mortality among patients with low cholesterol compared to others was 1.49 (95% CI: 1.16-1.91). The relative risk of non-cardiac death was 2.27 times higher in the low cholesterol group than in the controls (95% CI: 1.49-3.45), whereas the risk of cardiac death was the same in both groups (relative risk 1.09; 95% CI: 0.76-1.56). The most frequent cause of non-cardiac death associated with low total cholesterol was cancer. These results in patients with coronary heart disease add weight to previous studies associating low total cholesterol with an increased risk of non-cardiac death. However, a longer follow-up of this cohort of patients is necessary in order to clarify this association.

Adult↗
PubMed1996

Effect of aspirin on mortality in women with symptomatic or silent myocardial ischemia. Israeli BIP Study Group.

The benefit of aspirin therapy among women with coronary artery disease (CAD) is not well established. Previous studies have shown conflicting results among women. Data from 2,418 women with CAD screened for participation in the ongoing Bezafibrate Infarction Prevention (BIP) study were analyzed: 45% reported aspirin therapy. Baseline characteristics were similar in both groups. Cardiovascular mortality at 3.1 +/- 0.9 years of follow-up was 2.7% in the aspirin treated group versus 5.1% in the non-aspirin-treated women (p = 0.002). All cause mortality was 5.1% and 9.1%, respectively (p = 0.0001). Treatment with aspirin emerged as an independent predictor of reduced cardiovascular (RR = 0.61, 95% confidence interval [CI] 0.38 to 0.97) and all cause (RR = 0.66, 95% CI 0.47 to 0.93) mortality after multiple adjustment for possible confounders such as age, history of myocardial infarction, systemic hypertension, diabetes mellitus, peripheral vascular disease, current smoking, New York Heart Association classification, and concomitant treatment with digitalis. Women who benefited the most from aspirin therapy were older, diabetic, symptomatic, or had a previous myocardial infarction. Thus, treatment with aspirin was associated with reduced mortality among women with CAD. This study suggests that women with CAD should be treated with aspirin, unless specific contraindications exist.

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