RESUMO
We assessed whether acid fast bacilli (AFB) determination in gastric lavage (GL) and bronchial lavage (BL) contributes to diagnosis in cases radiologically suggestive of pulmonary tuberculosis but with either negative AFB in sputum or the inability to expectorate sputum. Of 129 cases recruited for the study, 22 were excluded due to evaluation as inactive disease or non-tuberculosis disease. The remaining 107 cases were evaluated in 2 groups. Group A consisted of 49 patients that could not expectorate sputum and from whom GL was obtained. In group B, BL was performed in 58 patients that had negative sputum smear. Smear positivity was 61.2% (30/49) and culture positivity was 30.6% (15/49) in group A, 51.7% (30/58) and 81% (47/58), respectively, in group B. Thirteen cases, in whom AFB could not be detected microbiologically but who were radiologically strongly suggestive of tuberculosis, were regarded as tuberculosis according to 'from treatment to diagnosis' criteria. In conclusion, detection of AFB positivity in the diagnosis of tuberculosis is important in terms of early initiation of treatment and detection of resistant bacilli. Therefore, we suggest that it would be helpful to obtain GL in cases where the patient is unable to expectorate sputum, and perform BL in cases with negative sputum smear.