Length of hospital stay (LOS) following acute myocardial infarction (AMI) has steadily decreased due both to improved treatments and cost considerations. Early discharge may adversely affect some patients who might benefit from extended monitoring. The Minnesota Heart Survey is a populationbased study of AMI in acute-care hospitals in the Minneapolis-St. Paul metropolitan area. Medical records were abstracted on a random sample of patients hospitalized with AMI in 1985, 1990, 1995, and 2001. Case fatality rates, adjusted for age and gender, were identified using mortality data from the index hospitalization and Minnesota death certificates. 4940 patients with validated AMI were identified from the combined 1985 (n=1306), 1990 (n=1550), 1995 (n=1087), and 2001 (n=515) surveys. The median LOS were 9, 8, 6, and 4 days, respectively. Patients hospitalized ≤4 days formed an increasing proportion of the population increasing from 11% (1985) to 58%(2001). In-hospital case fatality declined from 1985 to 2001 (11.6% to 5.4%, p<0.0001 for trend). There was a significant decline in both 1 month (3.3% to 2.4%, p=0.002 for trend) and 6-month (8.9% to 5.4%, p<0.0001) post-discharge mortality from 1985 to 2001. In conclusion, the progressive and substantial reduction in hospital LOS following AMI in the past 2 decades has not been associated with increased postdischarge mortality. These reductions in LOS are associated with increasing use of effective therapies.