Significant association between neutrophil aggregation in aspirated thrombus and myocardial damage in patients with ST-segment elevation acute myocardial infarction

Kentaro Arakawa, Satoshi Yasuda, Hiroyuki Hao, Yu Kataoka, Isao Morii, Yoichiro Kasahara, Atsushi Kawamura, Hatsue Ishibashi-Ueda, Shunichi Miyazaki

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

Background: This study was designed to clarify the relationship between myocardial damage and platelet-neutrophil aggregation in patients with acute myocardial infarction (AMI). Methods and Results: The study group comprised 107 patients with ST-segment elevation AMI, in whom aspiration catheter was used during emergency percutaneous coronary intervention. Patients were divided into 2 groups according to the cellular density of neutrophils in the aspirated sample: group L (n=53), ≤100 neutrophils/0.025 mm2 thrombus; group H (n=54), >100 neutrophils/0.025 mm2 thrombus. Myocardial blush grade (MBG) ≤1 and ST-segment resolution (STR) <50% were more frequently found in group H than in group L. Peak creatine kinase level tended to be higher and left ventricular ejection fraction (LVEF) at 6 months after onset was lower in group H than in group L. Multivariate analysis showed that high neutrophil density in aspirated thrombus was an independent predictor of MBG ≤1, STR <50%, and low LVEF at 6 months after onset. Conclusions: Platelet-neutrophil aggregates retrieved from ruptured plaque may be associated with impaired coronary microcirculation and resultant myocardial necrosis/dysfunction. These findings underscore the clinical importance of the interaction between thrombosis and inflammation in the pathogenesis of AMI.

Original languageEnglish
Pages (from-to)139-144
Number of pages6
JournalCirculation Journal
Volume73
Issue number1
DOIs
Publication statusPublished - 2009

Keywords

  • Inflammation
  • Lesion
  • Leukocytes
  • Myocardial infarction
  • Thrombus

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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