Spirometry after treatment completion for pulmonary tuberculosis - a necessity?

Area of Science:

• Pulmonology
• Infectious Diseases
• Radiology

Background:

• Pulmonary tuberculosis frequently causes irreversible lung damage like fibrosis and bronchiectasis.
• This structural damage can lead to post-tuberculosis lung disease (PTLD), characterized by chronic respiratory symptoms and reduced lung function.
• Microbiological cure of tuberculosis does not guarantee full recovery of respiratory health.

Purpose of the Study:

• To assess the prevalence and nature of functional and radiological impairments in patients post-anti-tubercular therapy.
• To understand the long-term respiratory health impact of tuberculosis.
• To identify predictors of lung damage after tuberculosis treatment.

Main Methods:

• A prospective study involving 175 adult patients within one year of completing anti-tubercular therapy.
• Evaluation included spirometry to assess lung function and radiological assessments for structural damage.
• Analysis correlated baseline sputum smear status with observed impairments.

Main Results:

• Spirometric abnormalities were found in 57.1% of participants.
• Restrictive lung patterns were most common (30.3%), followed by obstructive defects (16.6%) and Preserved Ratio Impaired Spirometry (PRISm) (10.3%).
• Sputum smear positivity at diagnosis was a strong predictor of obstructive disease and severe structural damage, even in young, non-smoking individuals.

Conclusions:

• Post-tuberculosis lung disease is prevalent and often irreversible, affecting respiratory health despite microbiological cure.
• Current assessment at treatment completion is insufficient to address long-term respiratory morbidity.
• Routine spirometry and comprehensive respiratory evaluation are recommended at the end of tuberculosis treatment to manage PTLD.