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[Changes in blood coagulation affected by rifampicin administration]
Summary
Rifampicin (RFP) administration can affect blood coagulation, leading to prolonged prothrombin time and reduced fibrinogen. Coagulation tests are more sensitive than ALT for detecting liver injury from RFP.
Area of Science:
- Pharmacology
- Hematology
- Hepatology
Context:
- Tuberculosis treatment often involves rifampicin (RFP).
- RFP is known to potentially cause liver injury, typically monitored by alanine aminotransferase (ALT) levels.
- The impact of RFP on coagulation parameters is not fully understood.
Purpose:
- To investigate the effects of rifampicin administration on blood coagulation characteristics.
- To compare the sensitivity of coagulation tests versus ALT for evaluating RFP-induced liver injury.
Summary:
- Seventy-three tuberculosis patients treated with RFP showed prolonged prothrombin time and reduced fibrinogen levels.
- These coagulation changes were dose- and duration-dependent, with severe effects noted upon RFP re-administration after normalized ALT.
- Coagulation factors II, VII, IX, X, I, V, VI, and VIII were all affected by RFP.
Impact:
- Coagulation tests are more sensitive than ALT for detecting liver injury induced by rifampicin.
- RFP treatment should be discontinued if fibrinogen levels fall below 1 g/L, even if ALT levels are within the normal range.
- This study highlights the importance of monitoring coagulation alongside liver function during RFP therapy.