The beach chair position benefits upper extremity surgeries through improved shoulder visibility and reduced nerve injury risk, yet its semi-upright angle (45–70°) creates substantial circulatory management challenges during anesthesia.

Under general anesthesia, the body loses its normal blood pressure regulation capacity. When positioned semi-upright, blood accumulates in lower extremities, decreasing cerebral blood flow. This reduced pressure gradient between heart and brain can trigger cerebral desaturation events — temporary but risky periods of inadequate brain oxygen supply.

Though rare, serious neurological outcomes including stroke, brain death, vision loss, and fatal outcomes have occurred from insufficient brain perfusion during beach chair surgeries. Severe neurologic complications including stroke, brain death, vision loss, and death have occurred particularly when combining the position with hypotensive anesthetic techniques.

Standard blood pressure cuffs provide inaccurate cerebral perfusion readings due to the vertical distance between measurement site and brain. Near-infrared spectroscopy (NIRS) offers real-time, noninvasive monitoring of brain oxygenation by measuring changes in hemoglobin 2.5 cm below the scalp.

Three primary management approaches optimize perfusion: hemodynamic strategies, ventilation modifications, and refined anesthetic technique with positioning awareness.

Preemptive fluid administration, such as fixed-volume intravenous boluses, helps maintain adequate preload, thereby improving cardiac output and mean arterial pressure (MAP) through volume expansion. Vasopressors like phenylephrine increase MAP through vessel constriction but may reduce cardiac output through reflex heart rate slowing, sometimes requiring inotropic assistance. Combined fluid and vasopressor interventions prove more effective than either alone.

Elevating inspired oxygen concentration and end-tidal CO₂ enhances regional cerebral oxygenation, independent of the anesthetic regimen.

Effective perfusion management integrating NIRS monitoring with customized fluid, vasopressor, and ventilation approaches minimizes cerebral ischemia risk and enhances patient safety.