Temporary pacing acts as an essential modality for maintaining hemodynamic stability in some life-threatening arrhythmias developed after cardiac surgery. We hereby discuss a case of partial balanced atrioventricular septal defect (AVSD) in which temporary pacemaker acted as a potential pitfall in the assessment of mitral regurgitation (MR). This case highlights the impact of pacing mode on MR severity and hence influencing perioperative decision-making after intracardiac repair.