Arrhythmias after coronary bypass surgery

Area of Science:

• Cardiology
• Cardiac Surgery
• Electrophysiology

Background:

• Atrial fibrillation (AF) is a frequent complication following coronary artery bypass grafting (CABG).
• Understanding AF's incidence, causes, and prevention is crucial for patient outcomes.

Purpose of the Study:

• To investigate the incidence, causes, and prevention of atrial fibrillation after coronary bypass surgery.
• To evaluate the efficacy of digoxin and propranolol in preventing AF post-CABG.

Main Methods:

• Prospective study of 90 patients undergoing CABG.
• Bedside and ambulatory electrocardiographic monitoring.
• Randomized groups: control, digoxin, and propranolol.

Main Results:

• Control group: 27% incidence of atrial fibrillation.
• Propranolol reduced AF incidence to 14.8%; digoxin had no effect and increased ventricular extrasystoles.
• Myocardial ischemic time and bundle branch block correlated with AF occurrence.

Conclusions:

• Atrial fibrillation is common after CABG, potentially due to myocardial ischemia or hypothermic injury.
• Beta-blockade (propranolol) effectively reduces AF incidence post-CABG.
• Digoxin is not effective for AF prevention and may increase ventricular arrhythmias.