title: [Clinical manifestation and prognosis of myocardial bridge].
abstract: OBJECTIVE
  To study the clinical manifestation, angiographic features, and prognosis of myocardial bridge.
  
  
  METHODS
  A retrospective analysis was made on the data of the clinical manifestation, coronary angiography, and prognosis of 35 patients with myocardial bridge, 29 males and 6 females, with an average age of 52.0 +/- 9.5 years, out of 2 871 patients undergoing coronary angiography 1 January 1996 - 20 February 2001.
  
  
  RESULTS
  The detection rate of myocardial bridge, mostly in the middle or distal parts of left anterior descending branch and 24 being isolated myocardial bridge, was 1.22% in coronary angiography. There was a significant difference in the extent of diameter stenosis during systolic stage between the group with atherosclerosis (68% +/- 15%, n = 15) and the group without atherosclerosis (54% +/- 14%, n = 20) in the vessel proximal to myocardial bridge (P < 0.01). The systolic diameter stenosis was more severe in the abnormal ECG group (63% +/- 13%, n = 12) than in the normal ECG group (54% +/- 14%, n = 12), P < 0.05. However, the systolic stenosis extent of myocardial bridge in the patients with typical angina pectoris (58% +/- 15%, n = 11) was not significantly different from that in the patients with atypical angina pectoris (54% +/- 15%, n = 13). The systolic stenosis extent of myocardial bridge were 69% +/- 9% (n = 7) and 58% +/- 16% (n = 26) in the patients with and without left ventricular wall hypertrophy respectively (P = 0.09). No malignant event occurred during the follow-up period of 3 - 50 months.
  
  
  CONCLUSIONS
  (1) The more severe the extent of systolic diameter stenosis, the more severe the myocardial ischemia and the more the possibility of abnormal ECG. (2) Myocardial bridge tends to promote or accelerate the atherosclerosis of the vessels proximal to it. (3) Left ventricular wall hypertrophy may promote the formation of myocardial bridge clinically. (4) The prognosis of myocardial bridge is good.
authors.affiliation: Department of Cardiology, Third Hospital, Peking University, Beijing 100083, China.
authors.forename: Li-jun
authors.initials: LJ
authors.lastname: Guo
authors.forename: Ting-ting
authors.initials: TT
authors.lastname: Tan
authors.forename: Jie-ming
authors.initials: JM
authors.lastname: Mao
mesh_terms: D017023:Coronary Angiography; D003327:Coronary Disease / Q000150:complications* / Q000628:therapy; D005260:Female; D006801:Humans; D008297:Male; D011379:Prognosis; D012189:Retrospective Studies