CARBON DIOXIDE ELIMINATION FROM EACH LUNG DURING ENDOBRONCHIAL ANAESTHESIA

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Abstract
The ventilation and carbon dioxide elimination of each lung, and pulmonary arterial pressure, were studied in 17 patients during the carry phases of anaesthesia for pulmonary surgery. The patients were ventilated mechanically to moderate hypocapnia. Expired tidal volume and carbon dioxide elimination rate of the lung to be operated on, and of the other lung, were similar in the supine position. There was a significant (PPCO2 of the upper lung after turning the patient on to the side. Simultaneously, the physiological deadspace fraction of tidal volume (VD/VT) increased from 42 to 45% (PVD/VT (Δ(VD/VT)) were negatively correlated (r=−0.68, PVD/VT) (%) = 0.7–0.83 × ΔMPAP (mm Hg). It was concluded that variations in pulmonary arterial pressure during surgical stimulation may significantly affect the pattern of carbon dioxide elimination in the lungs. However, there was no evidence that these effects were important clinically