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Relapse of Tuberculosis After Treatment in Human Immunodeficiency Virus—Infected Patients

Federico Pulido, MD; Jose-Maria Peña, MD; Rafael Rubio, MD; Santiago Moreno, MD; Juan González, MD; Carlos Guijarro, MD; Jose-Ramón Costa, MD; Juan-José Vázquez, MD
Arch Intern Med. 1997;157(2):227-232. doi:10.1001/archinte.1997.00440230105014.
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Objectives:  To evaluate the relapse rate of tuberculosis after a complete course of antituberculous therapy in human immunodeficiency virus—infected patients and to identify the risk factors for relapse.

Patients and Methods:  Historic cohort study of all adult patients who were diagnosed as having human immunodeficiency virus infection and a first episode of culture-proved tuberculosis at 2 university hospitals in Madrid, Spain, between 1986 and 1992, and who completed at least 6 months of treatment were included and followed up until September 1994.

Results:  Of 276 patients with human immunodeficiency virus infection and tuberculosis, 87 could not be evaluated (6 died before treatment, 39 died during treatment, 36 did not complete the planned therapy, and 6 were unavailable during treatment). The remaining 189 received a standard regimen (ie, 3 or 4 drugs, always including rifampin and isoniazid, for ≥6 months). The median duration of follow-up for these 189 patients was 31.5 months, with a total of 4668 patient-months of follow-up after treatment; 105 patients (56%) were followed up until death. The relapse rate was 7.9% (2.7/ 100 patient-years). With multivariate analysis, a shorter duration of treatment and a low CD4+ cell count were associated with a greater probability of relapse. Relapses occurred in 5 (3.4%) of 148 patients who were treated for 9 or more months (1.7/100 patient-years) and in 10 (24%) of 41 patients who were treated for less than 9 months (10.9/100 patient-years) (P<.001; relative hazard, 9.2; 95% confidence interval, 3.1-26.9).

Conclusions:  As standard antituberculous therapy for 9 months is associated with a low rate of relapse, maintenance therapy is not required. Duration of treatment for less than 9 months is associated with a high rate of relapse.Arch Intern Med. 1997;157:227-232


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