Observation and analysis of temporary J wave with T wave high-amplitude after off-pump coronary artery bypass

Objective To evaluate the factors associated with temporary J wave with T wave high-amplitude and its significations after off-pump coronary artery bypass(OPCAB).Methods Data of 55 patients undergoing OPCAB surgery were retrospectively analyzed.According to the phenomenon whether the J wave with T wave high-amplitude were observed by ECG,the patients were divided into a J wave with T wave high-amplitude group(observation group,18 patients) and non-J wave with T wave high-amplitude group(control group,37 patients).The culprit lesions,grades of coronary artery stenosis,duration of the operations,transient rise of cTnI after OPCAB and patients' ages of the two groups were compared.Results The rates of multi-vessel stenosis,coronary artery stenosis about 90%-100%,the duration of the operations that lasted more than 3 hours,transient rise of cTnI(0.1μg/L)after OPCAB and the ages above 60 of the observation group were higher than those of the control group[94.4%(17/18) to 32.4%(12/37),88.9%(16/18) to 35.1%(13/37),100%(18/18) to 40.5%(15/37),55.5%(10/18) to 16.2%(6/37),83.3%(15/18) to 27.0%(10/37)].Differences were statistically significant(P0.005).Conclusion The fact that the patients ECG showed J wave with T wave high-amplitude after OPCAB suggested that the lesions of coronary artery diseases were severe,the ranges were wide,the ages were older,the surgery injury was serious,and the myocardial ischemia and injury were serious.There is a potential risk of malignant arrhythmia in the patients whose ECG showed J wave with T wave high-amplitude after OPCAB.Therefore we should pay sufficient attention to them in clinical.