Figure 5

In five mechanically ventilated dogs, effect of 70 min of RPA occlusion on the following: (a) carbon dioxide volume exhaled per breath (VCO_2,br); (b) PCO₂; (c) dead space (VD); (d) ascending aortic cardiac output ( T); and (e) mean pulmonary artery pressure (Ppa). RPA occlusion began after time 0 (baseline). Solid symbol denotes significant difference (P < 0.05) from baseline measurement. ^*All stages during RPA occlusion were significantly different from baseline. PaCO₂, arterial PCO₂; PETCO₂, end-tidal PCO₂; P CO₂, mixed venous PCO₂; VD_alv/VT_alv, alveolar dead space : tidal volume fraction; VD_phy, physiologic dead space. From Breen et al [55].