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  • Title: Role of ischemic preconditioning and inflammatory response in the development of malignant ventricular arrhythmias after reperfused ST-elevation myocardial infarction.
    Author: Kaneko H, Anzai T, Naito K, Kohno T, Maekawa Y, Takahashi T, Kawamura A, Yoshikawa T, Ogawa S.
    Journal: J Card Fail; 2009 Nov; 15(9):775-81. PubMed ID: 19879464.
    Abstract:
    BACKGROUND: Sustained ventricular tachycardia and ventricular fibrillation (VT/VF) are major complications of ST-elevation myocardial infarction (STEMI), even in the era of reperfusion therapy. We sought to clarify the determinants of VT/VF after reperfused STEMI. METHODS AND RESULTS: Consecutive STEMI patients treated with primary percutaneous coronary intervention (n=457) were divided into 2 groups by the presence or absence of VT/VF during hospitalization. Serum C-reactive protein (CRP) level and peripheral white blood cell (WBC) count were serially measured. VT/VF was observed in 54 patients (12%). Prior infarction was more common and preinfarction angina was less in patients with VT/VF than those without. Peak CRP level (P < .0001), WBC count on admission (P=.008), and maximum WBC count (P=.0014) were higher in patients with VT/VF than those without. VT/VF, especially VT/VF later than 48 hours after onset, was associated with greater left ventricular (LV) dimension during convalescence. Kaplan-Meier curves and log-rank test revealed VT/VF to be a significant determinant of long-term major adverse cardiac events. Multivariate analysis revealed that prior infarction, absence of preinfarction angina, and peak CRP >or=10mg/dL were independent determinants of VT/VF. CONCLUSIONS: Lack of ischemic preconditioning, enhanced inflammatory response, and subsequent LV dysfunction are related to the development of VT/VF after STEMI.
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