Air embolism during surgery in the sitting position: signs and immediate interventions?

Air embolism during surgery in the sitting position: signs and immediate interventions?

• A. Sudden drop in end-tidal CO2, mill wheel murmur, hypotension
• B. Flood the field with saline, reposition to left lateral decubitus with head down (Durant maneuver), aspirate air from a central venous catheter if present, give 100% oxygen and hemodynamic support
• C. Stop anesthesia and abort procedure
• D. Increase FiO2 only

Answer: (C)

Venous air embolism in the sitting position is recognized by a sudden drop in end-tidal CO2, a characteristic mill-wheel murmur, and abrupt hypotension. These signs reflect air entering the venous system and obstructing pulmonary blood flow, leading to decreased ventilation–perfusion efficiency and reduced cardiac output. The immediate management is a rapid, multi-pronged response to minimize further air entry and to remove air from the circulation. Flooding the surgical field with saline helps stop additional air from being entrained into open veins. Repositioning the patient to the left lateral decubitus position with the head down (the Durant maneuver) traps air in the right atrium and ventricle, reducing its movement into the pulmonary circulation. If a central venous catheter is already in place, attempting to aspirate air through it can directly reduce the intravascular air burden. Administer 100% oxygen to both improve oxygenation and hasten the resorption of the entrained air; provide aggressive hemodynamic support with IV fluids and vasopressors as needed to maintain perfusion. If instability progresses or cardiac arrest occurs, follow resuscitation protocols, but the cornerstone is to stabilize the patient quickly with the above measures rather than waiting to abort the procedure.

Venous air embolism in the sitting position is recognized by a sudden drop in end-tidal CO2, a characteristic mill-wheel murmur, and abrupt hypotension. These signs reflect air entering the venous system and obstructing pulmonary blood flow, leading to decreased ventilation–perfusion efficiency and reduced cardiac output.

The immediate management is a rapid, multi-pronged response to minimize further air entry and to remove air from the circulation. Flooding the surgical field with saline helps stop additional air from being entrained into open veins. Repositioning the patient to the left lateral decubitus position with the head down (the Durant maneuver) traps air in the right atrium and ventricle, reducing its movement into the pulmonary circulation. If a central venous catheter is already in place, attempting to aspirate air through it can directly reduce the intravascular air burden. Administer 100% oxygen to both improve oxygenation and hasten the resorption of the entrained air; provide aggressive hemodynamic support with IV fluids and vasopressors as needed to maintain perfusion. If instability progresses or cardiac arrest occurs, follow resuscitation protocols, but the cornerstone is to stabilize the patient quickly with the above measures rather than waiting to abort the procedure.