A 6-year-old child from rural India presents with a 3-month history of low-grade fever, failure to thrive, and a persistent cough. Chest X-ray shows hilar lymphadenopathy with a right upper lobe infiltrate. Mantoux test is 18 mm. Regarding the management of childhood tuberculosis, all of the following are true EXCEPT:

Explanation

## Analysis of Pediatric TB Management Principles ### Correct Answer: Pyrazinamide contraindication in children **Key Point:** Pyrazinamide (PZA) is a FIRST-LINE agent in childhood TB and is routinely used in the intensive phase. While it does cause hyperuricemia, this is NOT a contraindication in children — asymptomatic hyperuricemia is acceptable. PZA is contraindicated only in patients with **acute gout attacks** (symptomatic), not merely elevated uric acid levels. ### Why the other statements are correct: | Statement | Accuracy | Clinical Relevance | |-----------|----------|-------------------| | Isoniazid hepatotoxicity | ✓ Correct | Baseline LFTs mandatory; monitor ALT/AST monthly during therapy | | 2-month intensive phase | ✓ Correct | Standard regimen: 2 months HRZE, then 4 months HR (total 6 months) | | Rifampicin P450 induction | ✓ Correct | Reduces levels of OCPs, warfarin, protease inhibitors; counsel on alternative contraception | | PZA hyperuricemia | ✓ True, but NOT a contraindication | Asymptomatic hyperuricemia is monitored but does not warrant discontinuation | ### High-Yield Distinction: **Warning:** Do not confuse **asymptomatic hyperuricemia** (acceptable; monitor) with **acute gouty arthritis** (rare in children; consider PZA substitution). The question tests this nuance — PZA is NOT contraindicated simply because it raises uric acid. **Clinical Pearl:** In pediatric TB, PZA is essential for shortening treatment duration from 9 to 6 months. Withholding it based on lab hyperuricemia alone is incorrect practice. ### Pediatric TB Drug Monitoring Summary: - **Isoniazid:** Hepatotoxicity (rare in children <5 years); monitor LFTs baseline and monthly - **Rifampicin:** Enzyme inducer; check drug interactions; orange discoloration of body fluids (reassure parents) - **Pyrazinamide:** Hyperuricemia (asymptomatic — continue); hepatotoxicity (less common than in adults) - **Ethambutol:** Optic neuritis (rare <5 years); visual acuity and color discrimination baseline and monthly if age >5 years [cite:Park 26e Ch 9]