Paper II
2019 February (2010 Scheme)

Question

Read the case history and answer the following questions: A 25 years old lady reported to the hospital with complaints of low grade fever since 10 days and weakness, fatigue, cough & expectoration since one month. Sputum was found to be positive for AFB and X-ray chest showed fibrotic changes in the left upper lobe. (2+2+2)  What is the treatment regimen to be followed for the patient  Explain the mechanism of action and adverse effects of Rifampicin  What would you advise if the lady was pregnant

Q16 marksEssays

Answer

This clinical picture (chronic cough, fever, weakness, sputum positive for AFB, fibrotic changes on chest X-ray) is diagnostic of pulmonary tuberculosis.

Treatment regimen

  • Standard first-line regimen: Intensive phase (2 months): Isoniazid + Rifampicin + Pyrazinamide + Ethambutol, followed by Continuation phase (4 months): Isoniazid + Rifampicin
  • Directly Observed Treatment (DOT) is recommended to ensure adherence

Mechanism of action and adverse effects of Rifampicin

  • Mechanism: Inhibits bacterial DNA-dependent RNA polymerase, blocking RNA synthesis (bactericidal)
  • Adverse effects: Hepatotoxicity, orange-red discolouration of body secretions, flu-like syndrome (intermittent dosing), potent hepatic enzyme induction (reduces efficacy of OCPs, warfarin), thrombocytopenia/haemolytic anaemia (rare), GI upset

Advice if the patient was pregnant

  • Standard first-line ATT (Isoniazid, Rifampicin, Ethambutol) is considered safe and should be continued in pregnancy, as untreated TB poses greater risk to both mother and fetus than treatment
  • Avoid Streptomycin — ototoxic to the fetus (can cause congenital deafness)
  • Pyrazinamide use varies by guideline; many current WHO/national protocols include it, but this should be per local guidelines
  • Give Pyridoxine (vitamin B6) supplementation with isoniazid to prevent peripheral neuropathy
  • Continue regular antenatal monitoring

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