Fibreoptic bronchoscopy in smear-negative pulmonary tuberculosis

Fifty smear-negative pulmonary tuberculosis patients underwent fibreoptic bronchoscopy. Bronchial aspirate smears of twelve patients and post-bronchoscopic sputum smears of fourteen patients were positive for acid-fast bacilli (AFB). Bronchial biopsy provided the diagnosis in 9 out of 30 patients. Brush smears were positive in 28 patients, being the only positive sample in ten cases. A high yield from brush smears was obtained due to their preparation from caseous material wherever visible in the bronchi. With these results a rapid diagnosis was established in 36 of the 50 patients. When culture results were available, a definite diagnosis of tuberculosis was made in 45 of the patients. The yield from brush smears was found to be significantly better when compared to bronchial aspirate smears (p < 0.01) and post-bronchoscopic sputum smears (p < 0.01).