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FEV1 Following Pulmonary Resection | Lung Cancer Patients

Purpose: To predict the postoperative FEV1 in a patient with lung cancer being evaluated for pulmonary resection using the equation of Nakahara et al.

Description

Nakahara et al developed an equation for predicting the postoperative FEV1 for a patient with lung cancer who underwent pulmonary resection. This can be used to help determine if the patient would have sufficient respiratory function after surgery to avoid complications. The authors are from the Osaka University Medical School in Japan.


post-operative FEV1 in liters =

= (1 – (((number of subsegments resected) – (number of obstructed subsegments in lung tissue to be resected)) / (42 – (number of obstructed subsegments in lung tissue to be resected)))) * (preoperative FEV1 in liters)

 

Lung Lobe

Number of Subsegments

right upper lobe

6

right middle lobe

4

right lower lobe

12

left upper lobe

10

left lower lobe

10

total number

42

 

number of obstructed subsegments in resected tissue =

= SUM(points for obstruction in resected lung tissue)

 

Degree of Obstruction in Subsegment

Points

76 - 100%

1

50% - 75%

0.5

0 – 49%

0

 

Performance:

• The measured FEV1 = (0.850 * (predicted FEV1)) + 0.286 +/- 0.296


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Specialty

Objective

ICD-10