The American journal of cardiology
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Randomized Controlled Trial Clinical Trial
Metoprolol in acute myocardial infarction. Other clinical findings and tolerability. The MIAMI Trial Research Group.
Fifteen minutes after injection there was a fall in mean heart rate (18%, p less than 0.001), systolic blood pressure (10%, p less than 0.001) and rate-pressure product (27%, p less than 0.0001) in the metoprolol group of patients in the MIAMI trial. Hypotension and bradycardia not necessarily associated with withdrawal of drug were more common in the metoprolol group (p less than 0.001). Atrioventricular block I was more common in the metoprolol group (p less than 0.03), whereas no such difference was observed for atrioventricular block II and III, asystole or pacemaker implantations. ⋯ The trial medication was withdrawn temporarily more often in the metoprolol than in the placebo group (p less than 0.001). However, permanent withdrawal of trial medication occurred with a similar frequency overall in both groups. More patients were withdrawn from the study because of cardiovascular reasons in the metoprolol group (9%) than in the placebo group (5%, p less than 0.001).(ABSTRACT TRUNCATED AT 250 WORDS)
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Randomized Controlled Trial Clinical Trial
Metoprolol in acute myocardial infarction. Arrhythmias. The MIAMI Trial Research Group.
Forty-five patients in the placebo (1.5%) and 29 in the metoprolol (1%) groups, respectively, were receiving antiarrhythmic drugs on a long-term basis before entry into the trial. Before randomization, 2.2% (n = 64) of the placebo and 1.7% (n = 50) of the metoprolol patients developed ventricular fibrillation (VF) in the hospital. The corresponding figures for atrial fibrillation or flutter were 3% (n = 87) and 3.3% (n = 94). ⋯ Although antiarrhythmic drugs were intended to be given only for major ventricular tachyarrhythmias a large proportion of patients received such treatment. Significantly more patients were treated with antiarrhythmics in the placebo (21.5%) than in the metoprolol group (19.2%, p = 0.03) during the study period, but predominantly during the first 5 days. Atrial fibrillation or flutter and other supraventricular tachyarrhythmias were significantly less frequent in the metoprolol than in the placebo group, as was the use of cardiac glycosides.(ABSTRACT TRUNCATED AT 250 WORDS)
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Clinical Trial
Metoprolol in acute myocardial infarction. Patient population. The MIAMI Trial Research Group.
During the recruitment phase of the MIAMI trial (December 1982 to March 1984), data on 26,439 patients eligible for inclusion were entered. Of these, 5,778 patients were included. Current treatment with either beta blockers or calcium-channel blockers (51%) was the most predominant reason for exclusion. ⋯ Before randomization 20% of the patients had normal electrocardiograms; 70% could be classified as having electrocardiographic signs of acute myocardial infarction; and 10% presented with other electrocardiographic abnormalities. Electrocardiographic signs at entry suggested a predominance of anterior wall infarctions. The randomized patients were not representative of eligible patients and the treatment groups were well balanced at entry.