Case-control Study on Atrial Electromechanical Coupling Time in Patients with New-onset Postoperative Atrial Fibrillation

Objective Atrial electromechanical coupling time (AEMCT) can be used to evaluate atrial electrical remodeling and early structural remodeling. This study explores the predictive role of AEMCT in postoperative new-onset AF (POAF) after off-pump isolated coronary artery bypass grafting (OPCAB). Methods Atotal of 116 patients who underwent OPCAB and left atrial diameter (LAD)<44mm were analyzed. According to 7-day continuous telemetry and Holter monitoring after OPCAB, the patients were divided into POAF group and non- POAF group. Results There was no significant difference in LAD between two group. Multivariate analysis found that P-A _LA , T _LA and HbA1c in POAF group were significantly higher than that in non-POAF group, that is, higher HbA1c, prolonged P-A _LA and T _LA were independent risk factors for POAF after OPCAB. P- A _LA had the highest diagnostic predicting value. The AUC of HbA1c, P-A _LA and T _LA with Cut -off was 0.766, 95% CI: 0.67–0.86, P < 0.001. Conclusion In OPCAB patients without significant LAD enlargement, when P-A _LA ≥ 96. 50 ms, there is more than 90% probability of POAF. The combination of HbA1c, P-A _LA and T _LA has the highest predictive value of POAF. AEMCT measured with TDI has the advantages of low cost and high repeatability.