経皮冠動脈介入後の血小板機能検査に基づく標準対高用量クロピドグレル:GRAVITASランダム化試験
Matthew J Price1, Peter B Berger, Paul S Teirstein
1Scripps Clinic, La Jolla, California, USA. price.matthew@scrippshealth.org
JAMA
|March 17, 2011
まとめ
高用量クロピドグレルは,皮経冠動脈干渉 (PCI) の後,治療中の反応性が高い患者の心血管イベントを減少させなかった. これらの患者には標準用量のクロピドグレルが推奨されます.
科学分野:
- 心臓病学 心臓病学
- 薬理学 薬理学とは
- 介入性心臓病学 介入性心臓病学
背景:
- 高血小板反応性は,パーキュタヌス冠動脈介入 (PCI) の後の心血管疾患の危険因子です.
- 治療時の高い反応性を管理するための最適な治療戦略は,まだ定義されていない.
研究 の 目的:
- 高用量対標準用量のクロピドグレルの有効性を比較する.
- PCI後に治療中の反応性が高い患者のアウトカムを評価する.
主な方法:
- A VerifyNow assay-Impact on Thrombosis And Safety (GRAVITAS) によるゲージングレスポンシビリティ試験では,2214人の患者をランダムに選択した.
- 患者は,6ヶ月間,高用量 (毎日600mg,毎日150mg) または標準用量 (毎日75mg) のクロピドグレルを投与されました.
- プライマリエンドポイント:心臓血管疾患による死亡,心筋梗塞,ステント血栓症の6ヶ月の発生率.
主要な成果:
- 高用量と標準用量のクロピドグレル群 (2.3%対2.3%;HR,1.01;P = .97) の間のプライマリエンドポイントにおいて有意な差異はありませんでした.
- 重度または中程度の出血率は,グループ間で類似していました (1.4%対2.3%; HR, 0.59; P = .10).
- 高用量クロピドグレルは30日後に高い治療時の反応性を有意に低下させた (40%対62%;P < .001).
結論:
- 高用量クロピドグレルは,PCI後の治療時の反応性が高い患者の臨床結果を改善しませんでした.
- 標準用量のクロピドグレルは,薬剤排出ステント付きPCI後の治療時の反応性が高い患者に対して適しています.
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