ECG features of patients with ST segment elevation acute myocardial infarction complicated J wave syn-drome / 心血管康复医学杂志

ABSTRACT

Objective:To analyze ECG features of patients with ST elevation acute myocardial infarction(STEMI) complicated J wave syndrome(JWS),and its significance.Methods:A total of 300 STEMI patients treated in our hospital were screened,including 59 cases with JWS(JWS group)and 241 cases without JWS(no JWS group).Ac-cording to survival condition,JWS group was divided into death group(n=12)and survival group(n=47).QT in-terval of every lead on the first 12-lead ECG examination after hospitalization was measured,and minimum and maximum value of QT interval were discovered,then QT interval dispersion(QTd)was calculated.Incidence of ventricular arrhythmia,death and infarct location were recorded in two groups.Results:QTd of JWS group was sig-nificantly longer than that of no JWS group[(52 ± 25)ms vs.(47 ± 22)ms,P=0.003].Compared with no JWS group,there were significant rise in incidence rates of ventricular arrhythmia(16.6% vs.30.5%),death(6.6%vs.20.3%)and anterior wall myocardial infarction(44.8% vs.76.3%)in JWS group.In JWS group,compared with survival group,there was significant reduction in minimum value of QT interval[(363 ± 33)ms vs.(319 ± 31) ms]and significant rise in QTd[(45 ± 22)ms vs.(80 ± 22)ms]in death group.P<0.05 or <0.01. Conclusion:The cause of STEMI complicated J wave syndrome may be related to increased QTd.It complicated J wave syndrome will lead to increased risk of serious arrhythmias and death.