title: The case of the unstable preoperative ECG before aortic valve replacement.
mesh_terms: D001024:Aortic Valve Stenosis / Q000150:complications* / Q000601:surgery; D002037:Bundle-Branch Block / Q000175:diagnosis*; D005117:Cardiac Complexes, Premature / Q000175:diagnosis*; D004562:Electrocardiography; D006801:Humans; D008297:Male; D008875:Middle Aged