title: Two hearts in one chest.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000175:diagnosis*; D004562:Electrocardiography; D006321:Heart / Q000503:physiopathology; D016027:Heart Transplantation; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000175:diagnosis*