BACKGROUND: The incidence of supraventricular arrhythmia (SVA) is high in patients with mitral valve prolapse (MVP). The purpose of our study was to determine the role of parameters showing atrial conduction heterogeneity such as P鈥憌ave dispersion (PWD) and atrial electromechanical delay (AEMD) in predicting the development of SVA in MVP patients. METHODS: A total of 76 patients with MVP (56 female, 20 male) were included in the study. The patients were divided into two groups according to the presence or absence of SVA: 36 patients were allocated to the non-SVA group and 40 patients to the SVA group. Heart rate variability (HRV), PWD, and AEMD values were determined and compared. RESULTS: The PWD was found to be higher in the SVA group. Interatrial EMD was 32.00鈥痬s (25.00-35.00) in patients with SVA while it was 18.00 ms in patients without SVA (11.00-23.75); the intra-atrial EMD was 17.0鈥痬s (10.00-20.00) in patients with SVA whereas it was 10.00鈥痬s (4.00-14.00) in patients without SVA. Lower HRV was found in the SVA group. CONCLUSION: In the SVA group, PWD and AEMD were increased while HRV values were decreased. Noninvasive parameters may help predict the presence and incidence of SVA during the follow-up of this group of patients.