Figure 2. (A) Mean +/− SD of PaO2during protocol conditions. Analysis of variance + the Huynh-feld test were used. *P < 0.05 vs. control, P < 0.05 vs. nitric oxide (NO), [pound sterling] P < 0.05 vs. No + almitrine (ALM). (B) Mean +/− SD of pulmonary arterial pressure, shunt, and oxygen pressure in mixed venous blood during protocol conditions. Analysis of variance + the Huynh-Feld test were used. *P < 0.05 vs. Control, P < 0.05 vs. NO, [pound sterling] P < 0.05 vs. NO + ALM.