Partial Cardiac Denervation to Prevent Postoperative Atrial Fibrillation After Coronary Artery Bypass Grafting

Importance: Efficient approaches to prevent postoperative atrial fibrillation (POAF) after coronary artery bypass grafting (CABG) are still needed. Objective: To investigate whether partial cardiac denervation, achieved by cutting off the ligament of Marshall (LOM) and resecting the fat pad along the Waterston groove, can reduce the risk of POAF following CABG. Design, Setting and Participants: This single-center, randomized clinical trial enrolled adult patients scheduled for isolated CABG in China. Enrollment was from August 15, 2022, to December 13, 2023; follow-up visits were 30 days after discharge. Interventions: Participants were randomized into the intervention group (CABG plus partial cardiac denervation) and the control group (CABG only) in a 1:1 pattern. All participants were continuously monitored for the incidence of POAF until day 6 after the operation. Main outcome and Measures: The primary end point was the incidence of POAF in 6 days, defined as a supraventricular arrhythmia lasting for more than 30 seconds. Results: The trial enrolled 430 patients (79 [18.4%] female; mean [SD] age, 61.9 [7.8] years). Compared with the control group, the 6-day incidence of POAF was significantly lower in the intervention group (18.1% vs 31.6%; P = .001; risk ratio, 0.57 [95% CI, 0.41-0.81]). To further support these results, a sensitivity analysis performed with Kaplan-Meier survival curves also showed a significant reduction in the occurrence of POAF in the intervention group (hazard ratio, 0.53 [95% CI, 0.36-0.79]; P = .002). Safety assessments showed no difference between the 2 groups, while postoperative medical cost was reduced in the intervention group. Conclusions and Relevance: This randomized clinical trial found that partial cardiac denervation was an effective procedure to reduce the occurrence of POAF after isolated CABG without additional postoperative complications. These results suggest that partial cardiac denervation may be a good option for cardiac surgeons to consider for preventing POAF after CABG. Trial Registration: ClinicalTrials.gov Identifier: NCT05009914.