title: Unusual response to intravenous verapamil in a patient with atrial fibrillation.
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000188:drug therapy* / Q000503:physiopathology; D004562:Electrocardiography; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D007263:Infusions, Parenteral; D008297:Male; D014700:Verapamil / Q000008:administration & dosage / Q000009:adverse effects*
chemical_list: D014700:Verapamil