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Diffuse Alveolar Hemorrhage Caused by Warfarin After Rifampicin Discontinuation

Overview
Journal Case Rep Med
Publisher Wiley
Specialty General Medicine
Date 2019 Feb 28
PMID 30809261
Citations 5
Authors
Affiliations
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Abstract

An 83-year-old man under warfarin therapy presented for assessment of prolonged prothrombin time and cough. High-resolution computed tomography findings of the chest showed diffuse alveolar hemorrhage. His international normalized ratio (INR) was 11.89. He had been treated with rifampicin for a persistent infection, but this had been discontinued about two months before admission. Rifampicin suppresses the anticoagulant activity of warfarin, which can lead to a need for increased doses of warfarin to achieve and maintain a therapeutic INR. More frequent INR monitoring is needed even after discontinuing rifampicin.

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