Electrical alternans.
D001145:Arrhythmias, Cardiac / Q000503:physiopathology*; D002305:Cardiac Tamponade / Q000503:physiopathology*; D004562:Electrocardiography; D006321:Heart / Q000503:physiopathology*; D006801:Humans; D010490:Pericardial Effusion / Q000503:physiopathology*