Document Detail

A high loading dose of clopidogrel reduces myocardial infarct size in patients undergoing primary percutaneous coronary intervention: A magnetic resonance imaging study.
MedLine Citation:
PMID:  22424023     Owner:  NLM     Status:  In-Data-Review    
BACKGROUND: We sought to determine whether a 600-mg loading dose of clopidogrel reduces myocardial infarct size compared with a 300-mg dose using contrast-enhanced magnetic resonance imaging in patients undergoing primary percutaneous coronary intervention (PCI) for ST-segment elevation myocardial infarction (STEMI).
METHODS: In 198 patients undergoing primary PCI for STEMI, contrast-enhanced magnetic resonance imaging was performed a median of 7 days after the index event. Infarct size was measured on delayed-enhancement imaging, and area at risk (AAR) was quantified on T2-weighted images.
RESULTS: Baseline characteristics were not significantly different between the 600-mg clopidogrel loading group (n = 117) and the 300-mg group (n = 81). The median infarct size was significantly smaller in the 600-mg group than in the 300-mg group (17.3% [8.9%-26.2%] vs 21.7% [12.9%-30.0%], P = .03). Myocardial salvage index ([AAR - infarct size] × 100/AAR) was greater in the 600-mg group than in the 300-mg group (47.7 [33.7-60.9] vs 32.0 [23.6-51.5], P < .01). Patients in the 600-mg group also had a significantly lower extent of microvascular obstruction and smaller number of segments with >75% of infarct transmurality than did those in the 300-mg group. After propensity score matching, the 600-mg group had smaller infarct size and greater myocardial salvage index compared with the 300-mg group. In multivariate analysis, the use of a 600-mg clopidogrel loading dose significantly reduced the risk of a large infarct (odds ratio 0.53, 95% CI 0.29-0.98, P = .04).
CONCLUSIONS: In patients undergoing primary PCI for STEMI, a 600-mg loading dose of clopidogrel reduced myocardial infarct size and improved myocardial salvage compared with a 300-mg loading dose.
Young Bin Song; Joo-Yong Hahn; Hyeon-Cheol Gwon; Sung-A Chang; Sang-Chol Lee; Yeon Hyeon Choe; Seung-Hyuk Choi; Jin-Ho Choi; Sang Hoon Lee; Jae K Oh
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  American heart journal     Volume:  163     ISSN:  1097-6744     ISO Abbreviation:  Am. Heart J.     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-03-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370465     Medline TA:  Am Heart J     Country:  United States    
Other Details:
Languages:  eng     Pagination:  500-7     Citation Subset:  AIM; IM    
Copyright Information:
Copyright © 2012 Mosby, Inc. All rights reserved.
Division of Cardiology, Department of Medicine, Seoul, Republic of Korea.
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