title: Fixed coupling in ventricular parasystole: a result of digitalis toxicity.
mesh_terms: D000368:Aged; D001145:Arrhythmias, Cardiac / Q000139:chemically induced / Q000175:diagnosis*; D004070:Digitalis; D004562:Electrocardiography; D005260:Female; D006333:Heart Failure / Q000150:complications; D006352:Heart Ventricles; D006801:Humans; D010946:Plants, Medicinal; D010947:Plants, Toxic