Lateral position test and quantitative lung scan in the preoperative evaluation for lung resection

Area of Science:

• Pulmonary Medicine
• Diagnostic Imaging

Background:

• Severe chronic obstructive pulmonary disease (COPD) poses challenges for predicting post-surgical lung function.
• Accurate prediction of postpneumonectomy forced expiratory volume in 1 second (FEV1) is crucial for patient management.

Purpose of the Study:

• To compare the predictive accuracy of quantitative lung scan (QLS) and lateral position test (LPT) for postpneumonectomy FEV1 in severe COPD patients.
• To assess the variability and reliability of the LPT method.

Main Methods:

• Quantitative lung scan (QLS) and lateral position test (LPT) were used to predict postpneumonectomy FEV1 in 24 severe COPD patients with lung masses.
• A subgroup of patients underwent multiple LPTs to evaluate measurement variability.

Main Results:

• A significant correlation (r = .72, p = 0.0006) was observed between FEV1 predicted by QLS and LPT.
• Over 59% of subjects showed a >10% difference in predicted FEV1 between the two methods.
• LPT exhibited 14 times greater variability compared to previously reported normal subjects, suggesting a need for ~37 tracings for acceptable error.

Conclusions:

• While QLS and LPT show good overall correlation for predicting postpneumonectomy FEV1, the high variability of LPT warrants extreme caution in its clinical application.
• Further research may be needed to refine LPT methodology or explore alternative predictive tools for severe COPD patients.