ObjectiveTo analyze the predictive value of QRS wave in the risk of sudden cardiac death in patients with acute anterior wall myocardial infarction.
MethodsNinety-eight patients with acute anterior myocardial infarction were divided into the early repolarization(ER) negative group and positive group(49 cases each group).The characteristics and morphology of the early repolarization pattern(ERP) in two groups were analyzed, and the incidence rates of ventricular fibrillation, ventricular tachycardia and death between two groups were compared.
ResultsThe time limit of QRS in positive group(97.96±7.23)min was significantly longer than that in negative group(89.07±7.93)min(P < 0.01), the heart rate in positive group(68.05±10.32) times/min was significantly slower than that in negative group(77.98±6.90) times/min(P < 0.01), and the OTc interval time in positive group(424.05±39.68)ms was significantly shorter than that in negative group(459.04±31.24)ms(P < 0.01).The differences of the QT and PR interval time between two groups were not statistically significant(P>0.05).In the positive group, the ERP mostly located in the lower wall, lower wall and precordial lead; the main manifestation of which located the incisor; and the ST segment was mostly horizontal elevation.The levels of triglyceride and potassium in positive group were significantly higher than those in negative group(P < 0.01), and the incidence rates of ventricular fibrillation, ventricular tachycardia and death in positive group were significantly higher than those in negative group(P < 0.01).
ConclusionsCompared with the acute anterior myocardial infarction patients without ER, the QRS duration of electrocardiogram prolongs, the QTc interval shortens, the heart rate decreases, the incidence rates of ventricular fibrillation and ventricular tachycardia increase significantly, and the risk of death increases significantly in the patients with ER.
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