ObjectiveTo study the influencing factors of the changes of electrocardiogram(ECG)and atrial fibrillation(AF)after mitral valve and aortic valve replacement.

MethodsOne hundred and thirty patients treated with mitral and aortic valve replacement were divided into two groups according to the occurrence of AF after operation.The changes of ECG before and after operation in two groups were observed, and the independent risk factors of AF were analyzed using univariate and binary logistic regression analysis.

ResultsThe results of univariate and binary logistic regression analysis showed that the cardiac function grade, preoperative pulmonary systolic pressure, other operations at the same period, duration of mechanical ventilation, pneumonia after operation, age of patients, and BNP level after operation were the influencing factors and independent risk factors of AF(P < 0.01).The electrocardiographic indexes QRSd and QTc in AF group were significantly higher than those in non-AF group(P < 0.01), and the QT in AF group was significantly lower than that in non-AF group(P < 0.01).After operation, the changes of the S1, S2, S3, R5 and R6 of QRS wave amplitude in AF group were significantly lower than those in non-AF group(P < 0.01).

ConclusionsThere are significant changes in ECG in patients with and without AF after mitral valve and aortic valve replacement.The cardiac function grade, preoperative pulmonary artery systolic pressure, other operations at the same period, mechanical ventilation time, postoperative pneumonia, patient age and postoperative BNP level are the independent risk factors of AF.