title: [Recurrent cycle length alternation in supraventricular tachycardia after intravenous verapamil].
mesh_terms: D004562:Electrocardiography; D006801:Humans; D013610:Tachycardia / Q000139:chemically induced*; D014700:Verapamil / Q000009:adverse effects*
chemical_list: D014700:Verapamil