title: Systolic atrial sounds during atrioventricular dissociation: the "wandering" fourth heart sound.
mesh_terms: D000368:Aged; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria / Q000503:physiopathology; D006327:Heart Block / Q000503:physiopathology*; D006801:Humans; D008297:Male; D010138:Pacemaker, Artificial; D010701:Phonocardiography