The Wenckebach phenomenon.
D001283:Atrioventricular Node / Q000503:physiopathology; D003937:Diagnosis, Differential; D004562:Electrocardiography; D006321:Heart / Q000503:physiopathology; D006327:Heart Block / Q000175:diagnosis / Q000503:physiopathology*; D006352:Heart Ventricles; D006801:Humans; D010507:Periodicity; D012848:Sinoatrial Block / Q000503:physiopathology; D012849:Sinoatrial Node / Q000503:physiopathology; D013610:Tachycardia / Q000503:physiopathology