title: Dynamic QRS variations in Wolff-Parkinson-White syndrome: electrocardiographic and clinical observations.
mesh_terms: D001283:Atrioventricular Node / Q000503:physiopathology; D004562:Electrocardiography; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D014927:Wolff-Parkinson-White Syndrome / Q000175:diagnosis* / Q000503:physiopathology