Evaluation of the Potential for Lung Recruitment with the Recruitment-to-Inflation Ratio during General Anesthesia.

Compared to patients with R/I of less than or equal to 0.40 (n = 10), those with R/I greater than 0.40 (n = 10) required higher positive end-expiratory pressure to optimize regional mechanics and balance collapse and overdistension (median [quartile 1, quartile 3]: 10 [8, 11] cm H 2 O vs .

8 [7, 9]; P = 0.03) and showed decreases in dead space (-2 [-5, 1] % vs .

3 [0, 5]%; P = 0.013) and greater reductions in collapse (-44 [-31, -47] % vs . -30 [-20, -38]%; P = 0.016) and dynamic lung strain (-0.06 [-0.09, -0.05] vs . -0.04 [-0.05, -0.02]; P = 0.04) with higher positive end-expiratory pressure.