Ventilation ‐ Perfusion Relationship during Hip Arthroplasty

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Abstract
Ventilation‐perfusion relationships (V̇A/Q̇) were studied during hip arthroplasty, using a multiple inert‐gas elimination technique. True shunt (V̇A/Q̇=0) increased on 10 out of 16 prosthesis‐anchoring occasions, while “low” V̇A/Q̇values (A/Q̇2 fell by l‐2kPa. “High” V̇A/Q̇. values (10A/Q̇100) was unaltered. Cardiac output did not change. Pulmonary artery pressure fell and airway peak pressure rose by approximately 2 mmHg. It is possible that the blood flow is forced from non‐dependent to dependent lung regions by the altered pressure in airways and blood vessels, creating a “high” V̇A/Q̇ in upper and shunt regions and a “low” V̇A/Q̇ in lower lung regions.