title: Verapamil therapy in variant angina: assessment by high-fidelity frequency modulated ambulatory ECG.
mesh_terms: D000368:Aged; D000553:Ambulatory Care; D000787:Angina Pectoris / Q000188:drug therapy*; D000788:Angina Pectoris, Variant / Q000188:drug therapy*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic; D014700:Verapamil / Q000627:therapeutic use*
chemical_list: D014700:Verapamil