title: Frequency and importance of unprovoked coronary spasm in patients with angina pectoris undergoing percutaneous transluminal coronary angioplasty.
mesh_terms: D000328:Adult; D000368:Aged; D000787:Angina Pectoris / Q000150:complications / Q000628:therapy*; D000800:Angioplasty, Balloon; D006328:Cardiac Catheterization; D003327:Coronary Disease / Q000150:complications / Q000628:therapy; D003329:Coronary Vasospasm / Q000453:epidemiology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies