Comparison of 30-day mortality between anterior-wall versus inferior-wall ST-segment elevation myocardial infarction complicated by cardiogenic shock in patients undergoing primary coronary angioplasty.
In this study, 30-day mortality from cardiogenic shock caused by left anterior descending artery (LAD) occlusion was compared with that caused by left circumflex (LCX) or right coronary artery (RCA) occlusion after primary percutaneous coronary intervention (PCI). Between May 2001 and December 2009, 212 consecutive patients with anterior-wall ST-elevation myocardial infarction complicated by cardiogenic shock due to LAD (n = 97) occlusion (group 1) and LCX or RCA (n = 115) occlusion (group 2) undergoing primary PCI were enrolled. The results showed a higher mean peak level of creatine phosphokinase and incidence of extracorporeal membrane oxygenation in group 1 than group 2 (all p < 0.01). However, no significant difference was noted in the achievement of normal blood flow in the infarct-related artery (p = 0.461) and 30-day morality (p = 0.338). Univariate analysis demonstrated a significant association of 30-day morality with age, lower left-ventricular ejection fraction, advanced congestive heart failure and unsuccessful reperfusion (all p < 0.02). Multivariate analysis revealed unsuccessful reperfusion as the most independent predictor of 30-day mortality (p = 0.002). No significant difference was noted in 30-day mortality between patients with acute myocardial infarction and cardiogenic shock caused by LAD occlusion and by either RCA or LCX occlusion undergoing primary PCI.