Seasonal variation in enzymatic infract size and mortality in patients with ST-segment elevation myocardial infarction.

OBJECTIVE To investigate any seasonal variation in enzymatic size, mortality rate, and localization of ST-segment elevation myocardial infraction (STEMI). METHODS Between March 2003 and September 2006, all patients admitted to the Madani Heart Center, Tabriz, Iran with the diagnosis of acute myocardial infarction (AMI) were included in this observational prospective study. Cases were divided into 4 groups according to the season that MI occurred, and enzymatic size and location were determined for each patient. RESULTS One thousand and two hundred six cases of AMI were analyzed during the study period. In our study, no seasonal difference was observed in demographic characteristics of patients. Also, no significant seasonal variation was found in enzymatic infract size, MI location, and in-hospital mortality rate. CONCLUSION Our findings does not support the hypothesis that enzymatic size, mortality rates, and location of STEMI varies by seasons.