Phenylephrine can be used as a temporary measure for hypovolemia until volume replacement can be given.

Phenylephrine can be used as a temporary measure for hypovolemia until volume replacement can be given.

• A. True
• B. False
• C. Only with crystalloids
• D. Only with pressors

Answer: (A)

Phenylephrine acts as a bridge to support blood pressure in the face of low blood volume by constricting peripheral arteries. This alpha-1–mediated vasoconstriction raises systemic vascular resistance and helps restore mean arterial pressure quickly, which can buy time while volume replacement is started. The key idea is that it doesn’t fix the underlying deficit of volume; it temporarily improves perfusion pressure so organs continue to receive blood while fluids are being given. Because increasing afterload and venous tone can reduce cardiac output if used inappropriately, it should be used cautiously and only for a short period as you proceed with resuscitation. Monitoring is essential, and you should continue volume replacement as the definitive treatment.

Phenylephrine acts as a bridge to support blood pressure in the face of low blood volume by constricting peripheral arteries. This alpha-1–mediated vasoconstriction raises systemic vascular resistance and helps restore mean arterial pressure quickly, which can buy time while volume replacement is started.

The key idea is that it doesn’t fix the underlying deficit of volume; it temporarily improves perfusion pressure so organs continue to receive blood while fluids are being given. Because increasing afterload and venous tone can reduce cardiac output if used inappropriately, it should be used cautiously and only for a short period as you proceed with resuscitation. Monitoring is essential, and you should continue volume replacement as the definitive treatment.