Modification of treatment strategies over a period of 14 years has markedly reduced cardiac events among post-myocardial infarction patients.

Abstract

Recent trends in the treatment of post-myocardial infarction (MI) patients and the factors accounting for the improvement in outcome are presented. A total of 6,602 post-MI patients (5,320 males, 1,282 females; 58.9 +/- 10.4 years of age) enrolled between 1986 and 1999 were followed up for an average of 12.6 +/- 16.3 months. The incidence of cardiac events, which included fatal and nonfatal recurrent MIs, sudden death and death by congestive heart failure, was highest (44.9 events/1,000 person year) in 1986-1987, but decreased steadily to 22.5 events/1,000 person year by 1997-1999 (Trend p<0.0001). This trend accompanied the increased use of coronary thrombolysis, percutaneous transluminal coronary angioplasty and coronary artery bypass graft surgery, increased prescription of antiplatelet agents (51.5%-83.4%), lipid-lowering agents (29.8%-52.6%) and angiotensin-converting enzyme inhibitors (5.3%-->41.0%), and reduced prescription of calcium antagonists (68.5%-41.0%) and nitrates (60.7%-->45.7%). These changes in treatment have led to a decreased incidence of angina pectoris, wall motion abnormalities and abnormal Q waves on electrocardiograms. The decline in the incidence of cardiac events among post-MI patients in the 14 years between 1986 and 1999 reflects implementation of new therapeutic modalities proven to be effective in clinical trials and in daily practice.