title: [Clinical features of patients with atypical coronary artery spasm].
abstract: OBJECTIVE
  This study is aimed to compare the clinical characteristics of patients with typical and atypical coronary artery spasm.
  
  
  METHODS
  Out of 64 patients with chest pain at rest and without significant coronary artery stenosis, coronary artery spasm was provoked by intracoronary injection of acetylcholine in 46 patients, including 12 with ST segment elevation (typical coronary artery spasm group) and 34 without ST segment elevation (atypical coronary artery spasm group). The demographic data, coronary angiographic findings, treadmill electrocardiogram, dipyridamole and rest thallium-201 myocardial perfusion computed tomography, and the follow-up clinical data of the two groups were compared.
  
  
  RESULTS
  The patients with typical coronary artery spasm were younger (47 +/- 6 vs. 58 +/- 12, P < 0.05) than patients with atypical coronary artery spasm group. Hyperlipidemia were more common in atypical coronary artery spasm group (74% vs. 33%, P < 0.05) and myocardial bridging was more common in patients with typical coronary artery spasm group (67% vs. 32%, P < 0.01). Focal coronary spasm during acetylcholine provocation was seen in 92% patients with typical coronary spasm and in 32% patients with a atypical coronary artery spasm (P < 0.01) while diffuse coronary spasm was seen in 8% patients with typical coronary spasm and in 68% patients with a atypical coronary artery spasm (P < 0.01). All patients with coronary artery spasm were treated with aspirin, calcium channel blockers, long-acting nitroglycerine, with or without lipid-lowering drugs, 2 patients with typical coronary spasm and 4 patients with atypical coronary spasm were rehospitalized due to chest pain and rest of the patients remained free of chest pain during the median follow-up period of 18 +/- 14 months.
  
  
  CONCLUSIONS
  Atypical coronary artery spasm is common in patients with rest angina and diffuse coronary microvascular spasm might be the cause of chest pain in these patients.
authors.affiliation: Department of Cardiology, Guangzhou General Hospital of Guangzhou Command, Guangzhou 510010, China.
authors.forename: Ding-cheng
authors.initials: DC
authors.lastname: Xiang
authors.forename: Jian-xin
authors.initials: JX
authors.lastname: He
authors.forename: Chang-jiang
authors.initials: CJ
authors.lastname: Hong
authors.forename: Jian
authors.initials: J
authors.lastname: Qiu
authors.forename: Jun
authors.initials: J
authors.lastname: Ma
authors.forename: Zhi-hua
authors.initials: ZH
authors.lastname: Gong
authors.forename: Jin-xia
authors.initials: JX
authors.lastname: Zhang
mesh_terms: D000109:Acetylcholine; D000328:Adult; D000788:Angina Pectoris, Variant / Q000175:diagnosis*; D017023:Coronary Angiography; D003329:Coronary Vasospasm / Q000175:diagnosis*; D004562:Electrocardiography; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis
chemical_list: D000109:Acetylcholine