title: Nonparoxysmal AV junctional tachycardia with 2/1 exit block during atrial fibrillation in the absence of digitalis toxicity. The effect of exercise.
mesh_terms: D001281:Atrial Fibrillation / Q000150:complications* / Q000175:diagnosis; D004077:Digoxin / Q000009:adverse effects; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D006339:Heart Rate; D006801:Humans; D008875:Middle Aged; D013610:Tachycardia / Q000175:diagnosis / Q000209:etiology*
chemical_list: D004077:Digoxin