Phase A Approximately 150 consecutive patients undergoing elective cardiac surgery (bypass and / or valve surgery)~Data regarding standard of care post-operative pacing and treatment of POAF, if applicable, will be collected from time of surgery until discharge~No use of an external bi-atrial pacing device~No use of Defipace~In-hospital data will be collected for all patients~Patients that developed POAF (n=50) will be followed-up with a phone call 30 days after surgery.~Phase B Approximately 300 consecutive patients undergoing elective cardiac surgery (bypass and / or valve surgery) with planned TMA implantation~In-hospital data will be collected for all patients~Use of the DefiPace system for the treatment (low-energy cardioversion) and post-operative prevention (bi-atrial pacing) of POAF will be documented (n=100). These patients will be followed-up with a phone call 30 days after surgery
Prospective, non-interventional, multi-center, international registry in two phases in consecutive patients undergoing elective cardiac surgery.~The DefiPace registry is designed in two phases~to document the standard of care in 50 patients with atrial fibrillation (AF)~to assess the treatment and outcomes of patients with post-operative atrial fibrilllation using low-energy cardioversion and subsequent bi-atrial pacing in clinical practice in 100 patients