A power analysis of data from our pilot study on a similar surgical population indicated that we need to study 14 subjects in each group to detect a 15-mm true difference in the mean visual analog scale (VAS) rating of the to rate the deflation of the target lung lobe with a standard deviation (S.D.) of 1.22, a type-I error of 0.0083 (0.05 / 6 possible comparisons) and a power of 90%. We will add 10% more patients for a final sample size of 60 patients to account for patients dropping out during the study.