Objective: To investigate whether P wave dispersion (Pd) is a predicting index for the occurrence of paroxysmal atrial fibrillation (PAF) in patients with diabetes. Methods: The maximum P wave duration (Pmax), the minimum P wave duration (Pmin), Pd and left atrial dimension (LAD) were measured in 42 diabetics with PAF history (group A) and 43 without PAF history (group B). Results: Only Pmax and Pd were significantly higher in group A than in group B. For predicting the occurrence of PAF, the higher sensiti...