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Genetic testing before anticoagulation? A systematic review of pharmacogenetic dosing of warfarin.

Abstract：

BACKGROUND:Genotype-guided initial warfarin dosing may reduce over-anticoagulation and serious bleeding compared to a one-dose-fits-all dosing method. OBJECTIVE:The objective of this review was to investigate the safety and efficacy of genotype-guided dosing of warfarin in reducing the occurrence of serious bleeding events and over-anticoagulation. DATA SOURCES:The authors searched PubMed, EMBASE and International Pharmaceutical Abstracts through January 23, 2009, without language restrictions. Selected articles were randomized trials comparing pharmacogenetic dosing of warfarin versus a "standard" dose control algorithm in adult patients taking warfarin for the first time. REVIEW METHODS:Two reviewers independently extracted data and assessed study quality using a validated instrument. The primary outcomes were major bleeding and time spent within the therapeutic range International Normalized Ratio (INR). Secondary outcomes included minor bleeding, thrombotic events and other measures of anticoagulation quality. RESULTS:Three of 2,014 studies (423 patients) met the inclusion and exclusion criteria. Differences in study quality, dosing algorithms, length of follow-up and outcome measures limited meta-analysis. Summary estimates revealed no statistically significant difference in bleeding rates or time within the therapeutic range INR. The highest quality study found no significant difference in primary or secondary outcomes, although there was a trend towards more rapid achievement of a stable dose (14.1 vs. 19.6 days, p = 0.07) in the pharmocogenetic arm. CONCLUSIONS:We did not find sufficient evidence to support the use of pharmacogenetics to guide warfarin therapy. Additional clinical trials are needed to define the optimal approach to use warfarin pharmacogenetics in clinical practice.

journal_name

J Gen Intern Med

journal_title

Journal of general internal medicine

authors

Kangelaris KN,Bent S,Nussbaum RL,Garcia DA,Tice JA

doi

10.1007/s11606-009-0949-1

subject

Has Abstract

pub_date

2009-05-01 00:00:00

pages

656-64

issue

5

eissn

0884-8734

issn

1525-1497

journal_volume

24

pub_type

杂志文章,评审

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