title: Simultaneous sinoatrial and atrioventricular Wenckebach phenomena.
mesh_terms: D001281:Atrial Fibrillation / Q000150:complications / Q000503:physiopathology; D001282:Atrial Flutter / Q000150:complications / Q000503:physiopathology; D004562:Electrocardiography; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000150:complications / Q000503:physiopathology*; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged