RESUMO
BACKGROUN: Many studies have shown that diabetes mellitus does not modify the clinical features and treatment outcomes. However, to our knowledge, those surveys for clinical features and treatment outcomes in pulmonary tuberculosis with diabetics were performed 15 years ago and have not been confirmed by more recent reports. Therefore, the purpose of this study is to investigate the effect of diabetes mellitus on microbiologic findings in far advanced stage of pulmonary tuberculosis and so to make some suggestions for the management of pulmonary tuberculosis with diabetes mellitus. METHODS: This study population was composed of 47 patients with far advanced stage of culture-proven pulmonary tuberculosis hospitalized in our department from 2000 through 2002. None of patients was intractable. Patients were divided into 4 groups; group1;nondiabetics with initial treatment, group2;diabetics with initial treatment, group3;nondiabetics with retreatment, group4; diabetics with retreatment. Treatment regimens were individualized on the basis of susceptibility results. A retrospective review of the records of all 47 patients with pulmonary tuberculosis and diabetes mellitus was carried out. The clinical features, bacteriologic, radiographic findings and treatment outcomes were compared among 4 groups. RESULTS: Time to negative conversion of AFB in sputum smear was significantly increased in diabetics group than nondiabetics, but time to negative conversion of AFB in sputum culture was not significant. Also time to negative conversion of AFB in sputum smear or culture was not affected by treatment pattern. The effect of antituberculosis medication significantly delayed response in diabetics with retreatment and resistance rate was higher in diabetics or retreatment. Time to negative conversion of AFB in sputum smear was related to cavitary size in radiographic findings, but time to negative conversion of AFB in sputum culture was related to drug sensitivity. Natural course of cavity on radiographic findings after antituberculosis therapy was not significant. CONCLUSION: It seems that diabetes mellitus does not affect bacteriological negative conversion rates except negative conversion rate of AFB in sputum smear, which chiefly related to cavitary size, in far advanced stage of pulmonary tuberculosis. Therefore, because the presence of AFB in sputum smear after 5th months of therapy is not necessarily a treatment failure in far advanced stage of pulmonary tuberculosis with diabetics, any decision regarding prologation or change in therapy maybe required based on the results of culture and drug susceptibility tests.