Left atrial volume index in assessing the risk of atrial fibrillation after surgical revascularization

Background: Left atrial dilatation, according to recent studies is important in the onset of atrial fibrillation, stroke and death. The most reliable echocardiographic parameter of left atrial dilatation is the left atrial volume index (LAVi). Aim: The objective of this study is to evaluate the impact of LAVi on the occurrence of atrial fibrillation after surgical myocardial revascularization (CABG). Methods: A prospective study included 116 patients undergoing surgical myocardial revascularization followed from admission to discharge. The examination was conducted at the Special Hospital “BH Centre for Heart” Tuzla. Preoperative ultrasound examination determined the parameters of left ventricular diastolic function and LAVi in all patients and postoperatively determined the onset of AF, the day of onset, duration in hours, number of episodes. Logistic regression was used to evaluate whether an event occurred or not, and the effect of time on the event of interest was analysed by Cox's parallel hazard regression. Results: 75.9% of patients had diastolic left ventricular dysfunction (LVDD). Preoperative values of LAVi are significantly higher when the LVDD grade is higher. In patients with LVDD and higher LAVi values, the risk of AF occurrence is greater, the longer the duration of AF, and the significantly greater number of AF episodes. As a result of the analysis, the most significant predictors of AF are: LVDD and LAVi. Conclusion: LAVi has the best hazard function in explaining the occurrence of atrial fibrillation after surgical myocardial revascularization.