## Clinical Context This is a **smear-positive, cavitary pulmonary TB case** with classic presentation (fever, night sweats, productive cough, cavitation on imaging). The diagnosis is already confirmed microbiologically. ## Why Start ATT Immediately **Key Point:** In smear-positive TB with radiological confirmation, starting standard first-line ATT (HRZE) immediately is the standard of care. Delaying treatment increases transmission risk and disease progression. **High-Yield:** According to NTEP (National TB Elimination Programme) and WHO guidelines, confirmed TB cases should begin ATT within 2 weeks of diagnosis. Sputum smear positivity + cavitary disease = confirmed TB; no further diagnostic confirmation needed. ## When DST is Indicated | Scenario | DST Timing | | --- | --- | | New smear-positive TB (no prior TB) | Not mandatory before starting ATT; baseline DST can be done in parallel | | TB treatment failure or relapse | Mandatory before ATT | | MDR-TB suspected or confirmed | Mandatory; use LPA (Line Probe Assay) or culture-based DST | | HIV co-infection | Recommended baseline DST | **Clinical Pearl:** DST can be sent in parallel with starting ATT in new cases; it does not delay initiation of standard therapy. ## Role of Imaging and Specialist Referral - **CT chest** is not required for diagnosis or initial management of straightforward cavitary TB; CXR is sufficient for staging. - **Bronchoscopy** is unnecessary when sputum smear microscopy is already positive and diagnosis is confirmed. - Specialist referral is reserved for drug-resistant TB, treatment failure, or diagnostic uncertainty. **Mnemonic:** **FAST START** — Confirmed TB → Anti-TB drugs → Start immediately → Treatment → Assess response.
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