P-wave duration and P-wave dispersion in patients with dilated cardiomyopathy

Background: P‐wave dispersion (PWD) has been reported to be associated with inhomogeneous and discontinuous propagation of sinus impulses. In the present study, we aimed to investigate PWD in patients with dilated cardiomyopathy. Method: The study population consisted of 72 patients with dilated cardiomyopathy and 72 healthy control subjects. Left atrial diameter, left ventricular end‐diastolic and end‐systolic diameters and left ventricular ejection fraction of all patients and control subjects were measured by means of transthoracic echocardiography. Maximum P‐wave duration (Pmaximum) and minimum P‐wave duration (Pminimum) were measured from the 12‐lead surface electrocardiogram. PWD was calculated as the difference between Pmaximum and Pminimum. Results: Pmaximum and PWD of patients with dilated cardiomyopathy were significantly higher than those of control subjects (Pmaximum: 126±12 ms vs. 116±10 ms, PWD: 47±6 ms vs. 38±7 ms, respectively, P