Tranexamic Acid contraindication question: Which of the following is a contraindication to TXA administration?

Tranexamic Acid contraindication question: Which of the following is a contraindication to TXA administration?

• A. SBP < 90 and HR > 110
• B. Injury within 2 hours of evaluation
• C. Chest or abdominal injury occurred more than 3 hours prior to proposed administration
• D. Non-hemorrhagic chest pain

Answer: (C)

The key idea is timing. Tranexamic acid works best when given early after injury, within about 3 hours. After that window, the benefit drops off and there isn’t evidence supporting continued use; in many protocols, presenting after 3 hours is treated as a contraindication because the treatment is unlikely to help and could introduce unnecessary risks. That’s why the scenario where the chest or abdominal injury occurred more than 3 hours before proposed administration is the contraindication. The other situations don’t fit as contraindications because they fall inside the time window or aren’t about active bleeding: giving TXA within 2 hours aligns with the recommended window for benefit; hypotension and tachycardia can occur with bleeding and TXA is still considered if active hemorrhage is present; non-hemorrhagic chest pain simply indicates no bleeding, in which case TXA isn’t indicated but isn’t a strict contraindication.

The key idea is timing. Tranexamic acid works best when given early after injury, within about 3 hours. After that window, the benefit drops off and there isn’t evidence supporting continued use; in many protocols, presenting after 3 hours is treated as a contraindication because the treatment is unlikely to help and could introduce unnecessary risks. That’s why the scenario where the chest or abdominal injury occurred more than 3 hours before proposed administration is the contraindication.

The other situations don’t fit as contraindications because they fall inside the time window or aren’t about active bleeding: giving TXA within 2 hours aligns with the recommended window for benefit; hypotension and tachycardia can occur with bleeding and TXA is still considered if active hemorrhage is present; non-hemorrhagic chest pain simply indicates no bleeding, in which case TXA isn’t indicated but isn’t a strict contraindication.