What is permissive hypotension in trauma, and in which scenarios is it generally considered?

• A. Target lower-than-normal blood pressure to limit ongoing bleeding until hemorrhage control is achieved.
• B. Immediately restore normal blood pressure with large volumes of crystalloids.
• C. Only treat hypotension after imaging confirms injuries.
• D. Use vasopressors to maintain MAP above normal.

Answer: (A)

Permissive hypotension is a resuscitation approach in hemorrhagic trauma where we intentionally keep blood pressure lower than normal to reduce ongoing bleeding and avoid dislodging forming clots, until definitive hemorrhage control is achieved (surgery or interventional radiology). By avoiding aggressive IV fluid resuscitation that can raise pressure and disrupt clots, we can preserve circulating blood volume for vital organs while bleeding is being controlled. In practice, this means aiming for a lower systolic pressure (roughly around 80-90 mmHg) and a modest MAP, rather than restoring normal blood pressure immediately.

This approach is generally considered in patients with suspected ongoing external or internal hemorrhage who do not have a traumatic brain injury, where maintaining adequate cerebral perfusion is critical. If there is suspected or confirmed brain injury, permissive hypotension is avoided because brain perfusion must be preserved.

The other options don’t fit because they advocate normalizing pressure with large fluid loads, waiting for imaging before addressing hypotension, or using vasopressors to push MAP above normal—strategies that can worsen bleeding or misalign with the goal of controlling hemorrhage first.