以下为句子列表：
英文: 2What drugs alter prothrombin time by interacting with warfarin levels (pharmacokinetics)?
中文: 2哪些药物可通过影响华法林水平改变凝血酶原时间（药代动力学角度）？
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英文: 3What drugs alter prothrombin time, but not by changing warfarin levels (pharmacodynamics)?
中文: 3哪些药物不是通过影响华法林水平而改变凝血酶原时间（药效动力学角度）？
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英文: 4 How is warfarin therapy monitored?
中文: 华法林治疗时如何监测？
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英文: Conclusions: Adjusted-dose warfarin and antiplatelet agents reduce stroke by approximately 60% and by approximately 20%, respectiely, in patients who hae atrial fibrillation. Warfarin is substantially more efficacious (by approximately 40%) than antiplate
中文: 结论：在房颤病人中，适量的华法林和抗血小板药的抗凝治疗分别减少了大约60％和20％的卒中发生率。而实际上，华法林比抗血小板治疗更加有效（大约40％）。
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英文: The risk/benefit ratio for warfarin treatment is good when patients are at high risk for stroke but narrowerwhen used in primary prevention in the elderly, where the benefit may be offset by bleeding risk, they write.
中文: 在有高风险中风的病人用华法林治疗的风险/获益率很好，但是在老年人预防性应用的风险/获益率有限，因为出血风险获益率偏移。
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