AI-ECG metrics in recipients of posttransplant cyclophosphamide (PTCY) or calcineurin inhibitor (CNI) based graft-vs-host-disease prophylaxis. (A) Cumulative incidence of clinical AF in recipients of PTCY-based prophylaxis and CNI-based prophylaxis. (B) Pre-HCT AI-ECG prediction of AF was similar between CNI and PTCY recipients. (C) Loess regression curves of post-HCT AI-ECGs in sinus rhythm. Post-HCT ECGs were subjected to AI-ECG inference, demonstrating transient increase in AF prediction in PTCY recipients relative to CNI recipients. ns, not significant.