J Cardiovasc Electrophysiol 1999 May;10(5):670-9.
Dispersion of filtered P wave duration by P wave signal-averaged ECG
mapping system: its usefulness for determining efficacy of disopyramide on
paroxysmal atrial fibrillation.
Kubara I, Ikeda H, Hiraki T, Yoshida T, Ohga M, Imaizumi T,
Department of Internal Medicine III and the Cardiovascular Research
Institute, Kurume University School of Medicine, Japan.