title: Characteristics of the pathological images of coronary artery thrombi according to the infarct-related coronary artery in acute myocardial infarction.
abstract: BACKGROUND
  Unstable plaque and coronary arterial thrombi sometimes induce a no-reflow phenomenon after intervention whereby there is sufficient reperfusion. The greater susceptibility of the right coronary artery to development of large thrombi makes successful reperfusion more difficult, therefore the characteristics of the pathological images of coronary arterial thrombi according to the infarct-related coronary artery were investigated.
  
  
  RESULTS
  Coronary arterial thrombi were extracted from 77 patients with acute myocardial infarction (AMI) using a thrombectomy catheter. The 36 patients had a thrombus containing atherosclerotic cells. Platelets, fibrin, and neutrophils were seen in all cases. The mean ratios of structural components of thrombi were 51.0 +/- 29.5% (mean +/- SD) of the platelet component, 19.9 +/- 25.7% of the erythrocyte component and 11.9 +/- 22.5% of atherosclerosis component. Erythrocyte-rich thrombi and mixed thrombi mainly composed of erythrocytes were seen in 14 of the 30 cases involving the right coronary artery, 6 of the 35 cases in the left anterior descending artery, 2 of the 11 cases of the left circumflex artery, and in the 1 case of saphenous vein bypass graft. There was significantly more erythrocyte component in the thrombi from the right coronary artery (28.7 +/- 30.1%) than in those from the left coronary artery (12.1 +/- 18.4%).
  
  
  CONCLUSIONS
  Coronary artery thrombi in AMI are composed principally of platelets. Atherosclerotic cells were identified within thrombi from some patients. In the right coronary artery there were many more thrombi that were rich in erythrocytes than in thrombi from the left coronary artery.
authors.affiliation: Department of Internal Medicine, Toyama Prefectural Central Hospital, Japan. drnagata@nsknet.or.jp
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Nagata
authors.forename: Kazuo
authors.initials: K
authors.lastname: Usuda
authors.forename: Akio
authors.initials: A
authors.lastname: Uchiyama
authors.forename: Manabu
authors.initials: M
authors.lastname: Uchikoshi
authors.forename: Yoshiteru
authors.initials: Y
authors.lastname: Sekiguchi
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Kato
authors.forename: Atsuo
authors.initials: A
authors.lastname: Miwa
authors.forename: Tadao
authors.initials: T
authors.lastname: Ishikawa
mesh_terms: D000368:Aged; D015906:Angioplasty, Balloon, Coronary; D017225:Atherectomy, Coronary; D001792:Blood Platelets; D017023:Coronary Angiography; D003328:Coronary Thrombosis / Q000000981:diagnostic imaging / Q000473:pathology* / Q000601:surgery; D003331:Coronary Vessels / Q000473:pathology* / Q000601:surgery; D004912:Erythrocytes; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009504:Neutrophils