TB meningitis in HIV — DTM&H MCQ

Correct answer: C — After a delay of several weeks once TB meningitis treatment is established

The correct answer is C, after a delay of several weeks once TB meningitis treatment is established. TB meningitis is a specific exception to the general rule of early ART in HIV related opportunistic infections, because randomised trial data show that starting ART within days of TB meningitis treatment increases severe, often fatal, central nervous system immune reconstitution inflammatory syndrome without improving survival. Current WHO guidance therefore recommends deferring ART for at least 4 weeks (up to 8 weeks) after starting anti-tuberculous therapy for TB meningitis, allowing the intracranial inflammatory process to settle under corticosteroid cover first. This differs from most other HIV associated TB, where ART is started within 2 weeks, reflecting the closed, non-compliant intracranial space where IRIS causes disproportionate harm. Why the other options are wrong: D. On the same day as TB treatment in every case: this is appropriate for many extrapulmonary and pulmonary TB presentations but not for TB meningitis, where trial evidence shows same day or very early ART increases grade 3 to 4 adverse events and mortality from CNS IRIS. E. After completing 12 months of TB treatment: this delay is far longer than necessary, leaves the patient without ART for the whole treatment course, and is not supported by any guideline; ART should begin within the treatment course, just delayed by weeks not months. A. Before giving corticosteroids: corticosteroids are started immediately alongside TB treatment to reduce mortality and inflammation; giving ART first would precede, not follow, the anti-inflammatory cover needed to blunt IRIS risk. B. After CSF glucose normalises: CSF glucose normalisation is slow and variable, is not a validated or practical trigger, and is not used in any recommendation to time ART initiation. Key point: TB meningitis is the classic exception where ART is deliberately delayed by several weeks after starting TB treatment because early ART raises the risk of severe, potentially fatal CNS IRIS.

Reference: WHO / TB Knowledge Sharing Platform, Timing of antiretroviral therapy in TB meningitis: ART delayed at least 4 weeks (initiated within 4-8 weeks) after starting TB meningitis treatment, https://tbksp.who.int/en/node/2082