Greater Manchester Cancer Calculating Post-operative Lung Function Answer the following questions: 1. Are there any obstructed segments on CT or bronchoscopy? 2. What do you expect will be resected at surgery (assume lobectomy is the standard of care)? Then calculate: • Total number of unobstructed segments – number of unobstructed segments to be removed = Answer A • Answer A ÷ total number of unobstructed segments = Answer B • Answer B x pre-operative % predicted lung function Example – patient under assessment for left upper lobectomy, FEV 1 68% predicted – what is the post-operative predicted FEV 1 ? There are no obstructed segments on CT or bronchoscopy. 19 – 5 = 14 14 ÷ 19 = 0.75 0.75 x 68 = 50 Predicted post-operative FEV 1 = 50% Segments: Right upper lobe= 3 Right middle lobe= 2 Right lower lobe= 5 Left upper lobe = 5 Left lower lobe = 4 Total = 19