Immediately after suction in both groups, arterial blood gases and static compliance were collected (Figure 1).
The formula used for static compliance was volume oscillation divided by plateau pressure minus positive end expiratory pressure.
Group data for oxygenation, static compliance, time to extubation, hospital length of stay, and postoperative pulmonary complications are presented in Tables 2 and 3, while individual data are presented in Table 4 (see eAddenda for Table 4).
Pa[O.sub.2] was 11.7 mmHg (95% CI 9.4 to 14.0, p < 0.001) greater in the experimental group while static compliance was 8.5 ml/cm[H.sub.2]O (95% CI 6.4 to 10.6, p < 0.001) greater than in the control group.
Overall there was a mean reduction in Fi[O.sub.2] of 28% but no improvement in other ventilatory indices such as tidal volume, PEEP, peak inspiratory pressure or static compliance
. Tomlinson et al commented that only three patients showed dramatic improvement in all respiratory characteristics and they concluded that their data did not support a benefit of emptying the uterus in an attempt to improve maternal oxygenation.