Acute myocardial infarction: differing preinfarction and clinical features according to infarct site and gender

While differences between anterior and inferior acute myocardial infarction have been observed, clinical features of lateral infarction are poorly investigated. However, the impact of gender on clinical course and prognosis after myocardial infarction is not fully understood. Electrocardiographically determined infarct site, demographic and clinical variables were prospectively recorded for 1623 consecutive patients admitted to Clinical Hospital Split between 1990 and 1994 due to a first Q-wave acute myocardial infarction. Anterior infarctions were correlated with a higher prevalence of diabetes (P=4×10−6) or pulmonary venous congestion (P=2×10−12); inferior infarctions were correlated with a lower prevalence of hypertension (P=0.001), hypercholesterolemia (P=0.02) or diabetes (P=10−5), and a higher prevalence of smoking (P=0.001); lateral infarctions were characterized by a smaller infarction size and lower prevalence of pulmonary congestion (P=0.002). Among men under the age of 50 with inferior infarction there were 90% smokers, which was significantly more than among their gender (P=0.005) or infarct site (P=2×10−5) counterparts. After adjustment for age and other confounding factors, the prevalence of inferior infarction was higher in men (P=0.002). Increased age (P=0.002), female gender (P=0.0006), anterior site (P=10−5), diabetes (P=0.0003), greater creatine kinase-MB fraction level (P=0.001) and pulmonary congestion (P=9×10−6) were independent predictors of an adverse hospital outcome. Each site of acute myocardial infarction has relatively specific preinfarction and clinical features. Our results suggest a greater importance of vasoconstriction in the pathophysiology of inferior infarction, especially in young male smokers, and greater importance of advanced atherosclerotic process in occurrence of anterior infarction.