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Figure 1 Arterial partial pressures of oxygen over time during the surgery. The difference between the arterial oxygen partial pressure (black line) and its ideal value (alveolar oxygen partial pressure, grey line) dramatically increased after cardiopulmonary bypass (CPB, black bar) as graded by the black fading between the curves. Time periods of classical ventilation (C, between 0 and 20 cmH2O), lung insufflation (I, at 5 cmH2O), lung recruitment manoeuvres (R, few long inspirations up to 40 cmH20 and repeated inspirations between 5–15 and 30–50 cmH2O) and spontaneous ventilation (S) are presented at the top of the figure
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