CABG REVEAL: Atrial Fibrillation After Coronary Artery Bypass Graft

We will utilize the Reveal XT implantable loop recorder (ILR) in order to monitor the incidence of AF in our post-CABG patients. The Reveal XT has been shown to be superior in comparison to the more commonly used sporadic ECGs.6 Unfortunately, the occurrences of arrhythmias tend to be "unpredictable" and often paroxysmal. Observers are unlikely to have the opportunity to record ECGs at the time of event until it is too late. The ability of the Reveal XT to continuously record ECGs over long periods of time has made it a superior and powerful diagnostic tool in patients with arrhythmias and arrhythmia related complications.

This was evident in the large multicenter PICTURE study whereby a large number of diagnostic tests were undertaken in patients with unexplained syncope without providing conclusive data, but in the same study with the Reveal ILR, the mechanism of syncope in the vast majority of these patients were established often at first onset of an arrhythmia.7

"The equivalent efficacy", if not superiority, of Reveal ILRs above conventional ECGs and Holter-monitors in detecting AF was established in the "XPECT" trial.8 Its sensitivity in detecting events not seen with ECGs and Holter monitoring post COX MAZE procedure (surgical procedure for AF) and post ablations for paroxysmal AF and persistent AF is well established.

Inclusion criteria

• 60 years of age or older
• Presenting for elective Coronary Artery Bypass Graft at Saint Thomas West Hospital

Exclusion criteria

• Patients <60 years of age
• Prior cardiac surgery
• Emergent surgery
• Need for concomitant cardiac surgery other than PFO closure
• Prior history of AF or Atrial flutter
• Prior atrial ablation
• Prior cardioversion
• Patients with prior permanent pacemaker
• Ejection fraction <35%
• Prior history of thyroid disease
• Prior history of a cardiomyopathy
• Patients without telephonic access