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Effect of Aspiration Thrombectomy on Microvascular Dysfunction in ST-Segment Elevation Myocardial Infarction With an Elevated Neutrophil Count
Korean Circulation Journal ; : 68-75, 2011.
Article in English | WPRIM | ID: wpr-129428
ABSTRACT
BACKGROUND AND

OBJECTIVES:

Aspiration thrombectomy (AT) during primary percutaneous coronary intervention (PCI) is an effective adjunctive therapy for ST-segment elevation myocardial infarction (STEMI). An elevated neutrophil count in STEMI is associated with microvascular dysfunction and adverse outcomes. We evaluated whether AT can improve microvascular dysfunction in patients with STEMI and an elevated neutrophil count. SUBJECTS AND

METHODS:

Seventy patients with STEMI undergoing primary PCI from August 2007 to February 2009 in our institution were classified by tertiles of neutrophil count on admission (7,600/mm3). The angiographic outcome was post-procedural thrombolysis in myocardial infarction (TIMI) flow grade. Microvascular dysfunction was assessed by TIMI myocardial perfusion (TMP) grade and ST-segment resolution on electrocardiography 90 minutes after PCI. The clinical outcome was major adverse cardiac event (MACE), defined as cardiac death, re-infarction, and target lesion revascularization at 9 months.

RESULTS:

There were no significant differences in the clinical characteristics and pre- and post-procedural TIMI flow grades between the neutrophil tertiles. As the neutrophil count increased, a lower tendency toward TMP grade 3 (83% vs. 52% vs. 54%, p=0.06) and more persistent residual ST-segment elevation (>4 mm 13% vs. 26% vs. 58%, p=0.005) was observed. The 9-month MACE rate was similar between the groups. On subgroup analysis of AT patients (n=52) classified by neutrophil tertiles, the same tendency toward less frequent TMP grade 3 (77% vs. 56% vs. 47%, p=0.06) and persistent residual ST-segment elevation (>4 mm 12% vs. 28% vs. 53%, p=0.05) was observed as neutrophil count increased.

CONCLUSION:

A higher neutrophil count at presentation in STEMI is associated with more severe microvascular dysfunction after primary PCI, which is not improved with AT.
Subject(s)

Full text: Available Index: WPRIM (Western Pacific) Main subject: Perfusion / Thymidine Monophosphate / Thrombectomy / Death / Electrocardiography / Percutaneous Coronary Intervention / Myocardial Infarction / Neutrophils Limits: Humans Language: English Journal: Korean Circulation Journal Year: 2011 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Perfusion / Thymidine Monophosphate / Thrombectomy / Death / Electrocardiography / Percutaneous Coronary Intervention / Myocardial Infarction / Neutrophils Limits: Humans Language: English Journal: Korean Circulation Journal Year: 2011 Type: Article