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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, FEV1 68% predicted – what is the post-operative predicted FEV1?There are no obstructed segments on CT or bronchoscopy.
19 – 5 = 14
14 ÷ 19 = 0.75
0.75 x 68 = 50Predicted post-operative FEV1 = 50%
Segments:Right upper lobe = 3 Right middle lobe = 2 Right lower lobe = 5 Left upper lobe = 5 Left lower lobe = 4 Total = 19
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