Pulmonary tuberculosis: Evaluation of current diagnostic strategy

Area of Science:

• Medical Diagnostics
• Infectious Diseases
• Respiratory Medicine

Background:

• Pulmonary tuberculosis diagnosis relies on culture, which can be time-consuming.
• Current diagnostic strategies aim for efficiency and speed.
• Optimizing the diagnostic algorithm is crucial for timely treatment.

Purpose of the Study:

• To identify diagnostic tools for faster pulmonary tuberculosis detection.
• To enhance the efficiency of the current tuberculosis diagnostic strategy.

Main Methods:

• Retrospective study (2015-2018) analyzing 354 patients with positive cultures.
• Evaluated sputum, fibroscopy, and post-fibroscopy specimens, including smear, culture, and nucleic acid amplification testing.
• Assessed incremental yield and time to diagnosis for each specimen type and testing method.

Main Results:

• Sputum diagnosis achieved 92% sensitivity, with a 7% gain from the third specimen.
• For smear-negative patients, fibroscopy and post-fibroscopy specimens identified an additional 8% of cases.
• Molecular testing significantly reduced diagnosis time in smear-negative patients (median 11 days).

Conclusions:

• The French tuberculosis diagnosis algorithm has areas for improvement.
• Dedicated procedures and reasoned use of molecular testing can enhance diagnosis in high-incidence settings.
• Findings support a prospective study to refine tuberculosis diagnostic protocols.