STセグメント上昇,心筋梗塞における未分化ヘパリンによる初期非治療的抗凝固薬の予測要因
Susan Cheng1, David A Morrow, Sarah Sloan
1Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.
Circulation
|February 25, 2009
まとめ
STセグメント上昇心筋梗塞において,未分化ヘパリンによる治療的抗凝固剤の達成は困難です. 非理想的な活性化部分性血栓プラスティン時間 (aPTT) は,特に脆弱な患者において,出血または再発症のリスクを高めます.
科学分野:
- 心臓病学 心臓病学
- 薬理学 薬理学とは
- クリニック・トライアル 臨床試験
背景:
- 体重ベースのノモグラムは,STセグメント上昇心筋梗塞 (STEMI) の不分化ヘパリン (UFH) 投与を最適化することを目的としています.
- ノモグラムにもかかわらず,UFHによる治療的抗凝固効果を達成することは,臨床的な課題であり続けています.
研究 の 目的:
- フィブリノリチック療法を受けているSTEMI患者における標準的な体重ベースのUFHノモグラムの有効性を評価する.
- 非治療的抗凝固剤と関連する要因とその臨床的結果を特定する.
主な方法:
- ExTRACT-TIMI 25研究からUFHと線維分解を投与された6055人のSTEMI患者の分析.
- UFHの発症から4~8時間以内に活性化された部分血栓形成時間 (aPTT) のモニタリング.
- aPTTレベルに影響を与える要因の評価と出血と再発症との関連.
主要な成果:
- 初期aPTTの33.8%のみが治療範囲内であった (1.50×2.00対照).
- 顕著に高いaPTT (対照群の≥2.75倍) は16.3%で発生し,出血のリスクの増加と関連していました.
- 顕著に低いaPTT (<1.25倍の対照群) は13.2%で発生し,再発症リスクの増加傾向を示した.
- 高齢,女性,体重の低さ,腎機能不全が,aPTT値の上昇と関連していた.
結論:
- 標準的な重量に基づくUFHノモグラムは,STEMIにおける非治療的抗凝固作用をしばしば引き起こす.
- 脆弱な患者グループは,サブ最適の抗凝固剤に罹患する傾向があります.
- 過剰な抗凝固薬は出血のリスクを高め,不十分な抗凝固薬は再発症のリスクを高めます.
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