title: Reduction in infarct size, arrhythmias and chest pain by early intravenous beta blockade in suspected acute myocardial infarction.
abstract: Four hundred seventy-seven patients suspected of having had acute myocardial infarction within less than 12 hours were randomized to receive i.v. atenolol followed by oral treatment for 10 days or to a control group. In patients with ECG changes indicative of infarction at entry, i.v. atenolol significantly reduced enzyme release by one-third and enhanced R-wave preservation. In patients without such ECG changes, treatment significantly prevented the development of infarction in a proportion of patients. There was also a significant reduction in R-on-T ectopics, repetitive ventricular arrhythmias and supraventricular arrhythmias. Treated patients had significantly greater pain relief and required fewer opiate analgesics. Significantly fewer atenolol-treated patients died by 10 days (the treatment period), had nonfatal cardiac arrests, developed heart failure, or suffered reinfarction.
mesh_terms: D000284:Administration, Oral; D001262:Atenolol / Q000627:therapeutic use*; D004562:Electrocardiography; D005260:Female; D006331:Heart Diseases / Q000150:complications / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000188:drug therapy* / Q000201:enzymology / Q000517:prevention & control; D010146:Pain / Q000188:drug therapy; D011412:Propanolamines / Q000627:therapeutic use*; D011897:Random Allocation
chemical_list: D011412:Propanolamines; D001262:Atenolol