Partial Cardiac Denervation Reduces Postoperative Atrial Fibrillation Risk After CABG: pCAD-POAF trial

POAF, a frequent issue after cardiac surgery, is associated with increased morbidity, prolonged hospital stays, and higher healthcare costs. Despite the availability of medications and other preventive measures, managing POAF remains a significant clinical challenge. Therefore, effective strategies to prevent postoperative atrial fibrillation after coronary artery bypass grafting remain a clinical necessity. Considering this, Ziang Yang, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China, and colleagues aimed to evaluate whether partial cardiac denervation, performed by severing the ligament of Marshall (LOM) and removing the fat pad along the Waterston groove, can effectively lower the risk of POAF in patients undergoing CABG.

For this purpose, the researchers conducted a single-center, randomized clinical trial in China, enrolling adult patients scheduled for isolated CABG between August 15, 2022, and December 13, 2023. Follow-up visits occurred 30 days after discharge. Participants were randomly assigned to either the intervention group (CABG plus partial cardiac denervation) or the control group (CABG only) in a 1:1 ratio. All participants were closely monitored for the occurrence of postoperative atrial fibrillation (POAF) until six days after the surgery.

The primary outcome was the incidence of POAF within six days, defined as a supraventricular arrhythmia lasting more than 30 seconds.

The trial revealed the following findings:

• The trial enrolled 430 patients, with a mean age of 61.9 years, including 18.4% females.
• The 6-day incidence of POAF was significantly lower in the intervention group (18.1%) than the control group (31.6%), with a risk ratio of 0.57.
• A sensitivity analysis using Kaplan-Meier survival curves further confirmed this reduction in POAF occurrence (hazard ratio, 0.53).
• Safety assessments showed no significant differences between the two groups, and the intervention group had reduced postoperative medical costs.

This randomized controlled trial found that partial cardiac denervation, achieved by cutting the LOM and removing the fat pad along the Waterston groove, effectively reduced the occurrence of POAF after isolated CABG.

"These findings suggest that partial cardiac denervation could be a viable option for cardiac surgeons to consider in reducing the risk of POAF following CABG," the researchers concluded.

Reference:

Yang Z, Tiemuerniyazi X, Xu F, et al. Partial Cardiac Denervation to Prevent Postoperative Atrial Fibrillation After Coronary Artery Bypass Grafting: The pCAD-POAF Randomized Clinical Trial. JAMA Cardiol. Published online November 17, 2024. doi:10.1001/jamacardio.2024.4639