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Why

Good question. The slide is trying to answer: when to advise MTP (medical termination of pregnancy) in drug-resistant TB pregnancy, and the cutoff is around 20 weeks because of a mix of medical and legal reasons.

Why 20 weeks is used in that algorithm

  1. Fetal risk is highest in early organ development
    • Major organ formation happens mainly in the first trimester and early second trimester.
    • Some DR-TB drugs have potential fetal toxicity concerns, so early pregnancy is a period of greater concern.
  2. MTP is simpler/safer earlier than later
    • Termination before 20 weeks is generally technically easier and has fewer complications than later gestation.
  3. Legal framework (India-specific in many teaching slides)
    • Historically, 20 weeks was the main legal limit in the MTP Act framework.
    • Laws have been updated in some contexts up to 24 weeks for specific categories, but many clinical flowcharts still use 20-week logic as a major decision point.
  4. After mid-pregnancy, focus shifts to maternal treatment continuation
    • If pregnancy is advanced or patient declines MTP, clinicians usually proceed with the safest effective DR-TB regimen and close fetal monitoring rather than delay TB care.

Important correction about the slide content

The note at the bottom saying something like “all SLD contraindicated in first 32 weeks” is not accurate by current practice.
In modern DR-TB management, treatment is individualized and not all second-line drugs are absolutely contraindicated for that long. The balance is:
  • treat maternal DR-TB effectively (maternal survival is critical),
  • avoid clearly harmful drugs when possible,
  • choose pregnancy-compatible options,
  • involve TB specialist + obstetric team.
If you want, I can give you a clean, updated DR-TB-in-pregnancy regimen table (which drugs are preferred, avoided, and monitoring needed) based on current WHO/NTEP-style practice.
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