Atrial dissociation.
D000368:Aged; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria; D006327:Heart Block / Q000175:diagnosis / Q000209:etiology*; D006352:Heart Ventricles; D006801:Humans; D009203:Myocardial Infarction / Q000150:complications