Does intermittent aortic cross clamping decrease the incidence of atrial fibrillation after coronary bypass surgery?

Area of Science:

• Cardiovascular Surgery
• Cardiac Arrhythmias
• Thoracic Surgery

Background:

• Atrial fibrillation (AF) is a common complication following coronary artery bypass grafting (CABG).
• Postoperative AF increases patient morbidity, prolongs hospital stays, and elevates healthcare costs.
• Identifying strategies to mitigate AF development after CABG is crucial.

Purpose of the Study:

• To compare the efficacy of intermittent aortic cross-clamping (IACC) versus hypothermic cardioplegic solution (HCS) in preventing postoperative AF after CABG.
• To evaluate the impact of different myocardial preservation techniques on AF incidence.

Main Methods:

• A retrospective study of 345 patients undergoing CABG between April 2004 and August 2005.
• Patients were divided into two groups: HCS (n=212) and IACC (n=173).
• Preoperative characteristics and postoperative AF rates were analyzed.

Main Results:

• The incidence of postoperative AF was significantly lower in the IACC group (11.05%) compared to the HCS group (21.52%).
• Diabetes mellitus was more prevalent in the HCS group.
• Postoperative calcium-antagonist use (HCS group) and smoking (IACC group) were identified as independent predictors of AF.

Conclusions:

• Intermittent aortic cross-clamping (IACC) is associated with a reduced incidence of postoperative atrial fibrillation after CABG compared to hypothermic cardioplegic solution (HCS).
• IACC, potentially through induced ventricular fibrillation, may have a protective effect against AF.
• Further research into the mechanisms underlying IACC's effect on AF is warranted.