Figure 3From: Manual hyperinflation partly prevents reductions of functional residual capacity in cardiac surgical patients - a randomized controlled trialMeasurements of functional residual capacity. Preoperative functional residual capacity (FRC (L) mean 95% CI) and FRC at one, three and five days after tracheal extubation in routine MH (N = 37; closed symbols) and control group (N = 41; open symbols). *, P < 0.04, **, P < 0.002.Back to article page