Results:

The mean age of the 3,010 patients was 67 years, and 40% were females. The initial diagnosis was ST-segment elevation MI in 31% of the patients. There were 643 rehospitalizations within 30 days in 561 (18.6%) patients. Overall, 30.2% of rehospitalizations were unrelated to the incident IM, 42.6% were related, and the relationship was unclear in the rest. Angiography was performed in 153 (23.8%) rehospitalizations, and revascularization was performed in 103 (16.0%) rehospitalizations, of which 46 (44.7%) had no revascularization during the index hospitalization. After adjustment for potential confounders, diabetes, chronic obstructive pulmonary disease, anemia, higher Killip class, longer length of stay during the index hospitalization, and a complication of angiography or reperfusion or revascularization were associated with increased rehospitalization risk. The 30-day incidence of rehospitalization was 35% in patients who experienced a complication of angiography during the index MI hospitalization, and 31% in those who experienced a complication of reperfusion or revascularization during the index MI hospitalization, compared with 17% in patients who had reperfusion or revascularization without complications.