title: A comparative study of calcium-ion antagonists in patients with variant angina.
mesh_terms: D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000188:drug therapy*; D000788:Angina Pectoris, Variant / Q000139:chemically induced / Q000188:drug therapy*; D001552:Benzazepines / Q000627:therapeutic use*; D004110:Diltiazem / Q000627:therapeutic use*; D004562:Electrocardiography; D004874:Ergonovine; D005260:Female; D006321:Heart / Q000503:physiopathology; D006801:Humans; D008297:Male; D008875:Middle Aged; D009543:Nifedipine / Q000627:therapeutic use*; D011725:Pyridines / Q000627:therapeutic use*; D014700:Verapamil / Q000627:therapeutic use*
chemical_list: D001552:Benzazepines; D011725:Pyridines; D014700:Verapamil; D004110:Diltiazem; D009543:Nifedipine; D004874:Ergonovine