Routine pulmonary function test can estimate the extent of tuberculous destroyed lung

Area of Science:

• Pulmonology
• Radiology
• Medical Imaging

Background:

• Tuberculous destroyed lung (TDL) is a sequela of tuberculosis characterized by lung destruction.
• Patients with TDL often experience reduced quality of life due to lung function deterioration.
• The precise mechanisms and characteristics of pulmonary function decline in TDL remain understudied.

Purpose of the Study:

• To investigate the patterns of respiratory impairment in TDL patients.
• To determine the correlation between the extent of lung destruction on CT scans and pulmonary function tests.

Main Methods:

• A novel scoring system (destroyed lung score, DLS) was developed based on the Goddard classification to quantify lung destruction on CT scans.
• Twenty-five TDL patients were enrolled in the study.
• Lung function was assessed using standard pulmonary function tests, including FEV1 and FVC.

Main Results:

• TDL predominantly presented as an obstructive respiratory pattern (64%).
• A significant negative association was found between the DLS and absolute values of FEV1 (r = -0.78) and FVC (r = -0.61).
• Percentage predicted values of FEV1 (r = -0.62) and FVC (r = -0.76) were also negatively correlated with the DLS, indicating poorer lung function with greater destruction.

Conclusions:

• Pulmonary function in TDL patients is significantly impaired.
• The extent of lung destruction, as quantified by CT scan and the DLS, is a key factor associated with the severity of respiratory impairment in TDL.