title: Can unstable angina pectoris be due to increased coronary vasomotor tone?
mesh_terms: D000328:Adult; D000788:Angina Pectoris, Variant / Q000188:drug therapy / Q000209:etiology* / Q000503:physiopathology; D000792:Angiography; D006328:Cardiac Catheterization; D017023:Coronary Angiography; D003326:Coronary Circulation; D003329:Coronary Vasospasm / Q000209:etiology*; D003331:Coronary Vessels / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009543:Nifedipine / Q000627:therapeutic use*; D011725:Pyridines / Q000627:therapeutic use*; D014666:Vasomotor System / Q000187:drug effects / Q000503:physiopathology*
chemical_list: D011725:Pyridines; D009543:Nifedipine