European heart journal
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European heart journal · Dec 1995
Inferior ST segment depression as a useful marker for identifying proximal left anterior descending artery occlusion during acute anterior myocardial infarction.
To determine whether or not ST segment deviation on admission electrocardiograms can identify patients with anterior acute myocardial infarction due to proximal left anterior descending artery occlusion, the magnitude and location of ST segment elevation or depression were compared between patients with proximal left anterior descending artery occlusion (group A, n = 47) and those with distal left anterior descending artery occlusion (group B, n = 59). ST segment depression in each of the inferior leads was significantly greater in group A than in group B. The incidence of ST segment depression > or = 1 mm in each of the inferior leads (II; 81% vs 27%, III; 85% vs 54%, aVF; 87% vs 47%, P < 0.01) was significantly higher in group A than in group B. ⋯ ST segment depression > or = 1 mm in all of the inferior leads was most valuable for identifying group A patients (77% sensitivity and 78% specificity). In contrast, the maximal ST segment elevation in lead V2 alone or ST segment elevation > or = 1 mm in lead aVL had a low diagnostic value (43% sensitivity and 86% specificity, 66% sensitivity and 53% specificity, respectively). In conclusion, this study indicates that analysis of ST segment deviation in the inferior leads is useful for identifying patients with acute anterior myocardial infarction due to proximal left anterior descending occlusion.
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European heart journal · Dec 1995
Time domain analysis of the signal averaged electrocardiogram in patients with a conduction defect or a bundle branch block.
Doubts have been expressed about the clinical usefulness of time domain analysis of the signal averaged electrocardiogram in patients with prolonged QRS complex duration. We studied 147 patients using a signal averaged ECG (40-250 Hz) whose QRS complex was longer than 100 ms. A baseline electrophysiology study was also performed in 128 of these patients. ⋯ The same criteria applied to patients with a major conduction defect were sensitive (sensitivity: 87%) but non-specific (specificity: 50%). However, by using modified late potential criteria, such as the presence of two of any of the following three signal averaged parameters: filtered QRS duration > or = 145 ms, low amplitude signal duration > or = 50 ms, root mean square of the last 40 ms of the filtered QRS complex < or = 17.5 microV, we derived a non-optimal but still acceptable combination of sensitivity (68%) and specificity (73%). We conclude that traditional late potential criteria can be applied in patients with a minor conduction defect, but modification of these criteria is necessary to derive useful clinical information for risk stratification of patients with a QRS complex duration > or = 120 ms.
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European heart journal · Dec 1995
Procedures associated with infective endocarditis in adults. A case control study.
To assess the relative risk of infective endocarditis associated with various procedures and the protective efficacy of antibiotic prophylaxis by a case-control study. ⋯ Procedures do increase the risk of infective endocarditis. The interpretation of the apparent low risk associated with dental procedures may be as a result of the current practice of antibiotic prophylaxis. Our data suggest that surgery should be more clearly mentioned in future guidelines, and reemphasize that a rigorous treatment of any focal infection in cardiac patients is mandatory. From the efficacy rate of antibiotic prophylaxis,it can be estimated that the overall incidence of infective endocarditis might be reduced by 5 to 10% in France by appropriate use of antibiotic prophylaxis in cardiac patients.
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European heart journal · Dec 1995
Randomized Controlled Trial Clinical TrialFurther elevation of the ST segment during the first hour of thrombolysis. A possible early marker of reperfusion.
To evaluate the clinical implications of early electrocardiographic changes during thrombolysis in a randomized study in patients with an acute myocardial infarction. ⋯ Additional ST segment elevation is frequently observed during the first hour of intravenous thrombolysis with streptokinase. Its' association with a subsequent early decline of ST elevation, reduced mortality, a shorter time interval to peak creatine kinase, and a high rate of late recanalization, suggest that in some patients it is one of the earliest markers of reperfusion.
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European heart journal · Dec 1995
Randomized Controlled Trial Comparative Study Clinical TrialEffect of metoprolol on death and cardiac events during a 2-year period after coronary artery bypass grafting. The MACB Study Group.
To evaluate the effect of long-term treatment with metoprolol after coronary bypass grafting on death and cardiac events. ⋯ Prophylactic treatment with metoprolol over a 2-year period after coronary artery bypass grafting did not reduce death or the development of cardiac events. However, the 95% confidence limits ranged from the possibility of a 30% reduction in events to a 68% increase in events if patients were treated with metoprolol as compared with placebo.