Figure 5. Indices of pulmonary blood flow changes during ventilation .

A, mean arterial transit time (s,± SEM) in the left and right lungs. B, maximum percentage change grey value in the left and right main axial arteries at the seventh intercostal space divided by the arterial transit time (% change s^–1 ± SEM). Data shown are at each ventilation period (0LV, 1LV₁, 1LV₂ and 2LV) in N₂ first (solid squares), air first (crosses) and O₂first (open circles) groups. ^a P < 0.05 compared to baseline (0LV) in the same lung in the same group; ^b P < 0.05 compared to single‐lung ventilation (both 1LV₁ and 1LV₂) in the same lung in the same group.