title: Alternate long and short coupling intervals in ventricular extrasystolic bigeminy.
mesh_terms: D000328:Adult; D001146:Arrhythmia, Sinus / Q000503:physiopathology*; D004562:Electrocardiography; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008297:Male; D013599:Systole