The theory of permissive hypotension involves withholding fluid resuscitation until the systolic blood pressure is less than what value?

• A. 70 mmHg
• B. 80 mmHg
• C. 90 mmHg
• D. 100 mmHg

Answer: (B)

Permissive hypotension focuses on resuscitating hemorrhagic patients in a way that limits bleeding while preserving organ perfusion. The idea is to avoid giving large volumes of fluid that can raise blood pressure enough to dislodge clots or worsen hemorrhage, yet still keep vital organs perfused. By withholding fluid until the systolic blood pressure falls to about 80 mmHg, you prevent over-resuscitation and reduce the risk of increasing bleeding. Once SBP drops below this threshold, you resume controlled fluid administration to bring pressure back up gradually, aiming for a low-to-moderate target around 80–90 mmHg rather than normal levels. The value of 80 mmHg is the threshold that aligns with this approach.

Other options would either push resuscitation too early (higher thresholds) or allow too much hypotension before treatment (lower thresholds), which deviates from intentionally limiting fluids while maintaining essential perfusion.