What is the typical first-line management for intraoperative hypotension due to spinal anesthesia?

What is the typical first-line management for intraoperative hypotension due to spinal anesthesia?

• A. Prolonged sedation.
• B. Discontinue anesthesia.
• C. Fluid bolus administration followed by vasopressor support (commonly phenylephrine).
• D. Immediate intubation.

Answer: (C)

The key idea is that spinal anesthesia causes a sympathetic block, which leads to vasodilation and pooling of blood in the venous system. That combination lowers venous return and systemic vascular resistance, producing hypotension. The typical first-line approach is to correct this with a fluid bolus to restore preload, followed by vasopressor support to increase vascular tone. Isotonic crystalloid boluses (often 250–500 mL) help improve venous return, and if hypotension persists, a vasopressor such as phenylephrine (a pure alpha-1 agonist) is started to raise systemic vascular resistance and mean arterial pressure. This sequence addresses both the reduced preload and the decreased tone caused by the spinal block. Prolonged sedation, stopping the anesthesia, or immediate intubation aren’t appropriate first-line steps for this scenario. Intubation is reserved for airway or respiratory failure, not the hemodynamic cause itself.

The key idea is that spinal anesthesia causes a sympathetic block, which leads to vasodilation and pooling of blood in the venous system. That combination lowers venous return and systemic vascular resistance, producing hypotension.

The typical first-line approach is to correct this with a fluid bolus to restore preload, followed by vasopressor support to increase vascular tone. Isotonic crystalloid boluses (often 250–500 mL) help improve venous return, and if hypotension persists, a vasopressor such as phenylephrine (a pure alpha-1 agonist) is started to raise systemic vascular resistance and mean arterial pressure. This sequence addresses both the reduced preload and the decreased tone caused by the spinal block.

Prolonged sedation, stopping the anesthesia, or immediate intubation aren’t appropriate first-line steps for this scenario. Intubation is reserved for airway or respiratory failure, not the hemodynamic cause itself.