Effects of 600 mg versus 300 mg Loading Dose of Clopidogrel in Asian Patients with ST-Segment Elevation Myocardial Infarction Undergoing Primary Percutaneous Coronary Intervention: Long-Term Follow-Up Study.
10.3349/ymj.2012.53.5.906
- Author:
Pil Sang SONG
1
;
Joo Yong HAHN
;
Young Bin SONG
;
Jin Ho CHOI
;
Seung Hyuk CHOI
;
Gu Hyun KANG
;
Kye Taek AHN
;
Woo Hyun LIM
;
Kyung Woo PARK
;
Hyo Soo KIM
;
Hyeon Cheol GWON
Author Information
1. Division of Cardiology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea. jyhahn@skku.edu
- Publication Type:Original Article
- Keywords:
Clopidogrel;
myocardial infarction;
percutaneous transluminal coronary angioplasty
- MeSH:
Angioplasty, Balloon, Coronary;
Asian Continental Ancestry Group*;
Follow-Up Studies*;
Humans;
Myocardial Infarction*;
Percutaneous Coronary Intervention*;
Stents;
Thrombosis
- From:Yonsei Medical Journal
2012;53(5):906-914
- CountryRepublic of Korea
- Language:English
-
Abstract:
PURPOSE: The optimum loading dose of clopidogrel has not been established in Asian patients with ST-segment elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention (PCI). Our aim was to evaluate the impact of different clopidogrel loading doses on short- and long-term clinical outcomes in Asian STEMI patients undergoing primary PCI. MATERIALS AND METHODS: We studied 691 STEMI patients undergoing primary PCI, loaded with 600 mg (n=381) or 300 mg (n=310) of clopidogrel. The primary outcome was major adverse cardiac events (MACEs), defined as a composite of all-cause death, reinfarction, or target vessel revascularization (TVR). RESULTS: Baseline clinical and peri-procedural characteristics were mostly comparable between the 600 mg and 300 mg groups. There were no differences in 1 month MACEs as well as all-cause death, reinfarction, TVR, and stent thrombosis between the two groups. After a median follow-up of 921 days, MACEs [adjusted hazard ratio (HR) for the 600 mg group 1.79, 95% confidence interval (CI): 0.80-3.97, p=0.153], all-cause death (adjusted HR for the 600 mg group 0.97, 95% CI: 0.50-1.88, p=0.928), reinfarction (adjusted HR for the 600 mg group 1.03, 95% CI: 0.55-1.91, p=0.937), and TVR (adjusted HR for the 600 mg group 1.36, 95% CI: 0.68-2.69, p=0.388) did not differ between the two groups. These results were reliable even after analysis of propensity score-matched population, and were also constant among various subgroups. CONCLUSION: A 600 mg loading dose of clopidogrel did not result in better short- and long-term clinical outcomes in Asian STEMI patients undergoing primary PCI.
