A 35-year-old man from rural Maharashtra presents with a 3-month history of fever, weight loss, and a painless ulcer on his left foot. Biopsy shows caseating granulomas with acid-fast bacilli on Ziehl-Neelsen staining. What is the drug of choice for treatment of this condition?
A. Dapsone + Rifampicin
B. Isoniazid monotherapy
C. Streptomycin monotherapy
D. Isoniazid + Rifampicin + Pyrazinamide + Ethambutol
Explanation
Diagnosis: Tuberculosis with Granulomatous Inflammation
The clinical presentation of fever, weight loss, and a chronic ulcer with caseating granulomas and acid-fast bacilli is diagnostic of tuberculosis, a classic cause of granulomatous inflammation.
First-Line Treatment Regimen
Key Point
The standard first-line anti-tuberculosis regimen is a 4-drug combination for the intensive phase (2 months), followed by a 2-drug maintenance phase (4 months).
The 4-drug regimen (HRZE) is essential to prevent drug resistance. Monotherapy or 2-drug regimens are inadequate and lead to treatment failure and MDR-TB.
Clinical Pearl
Pyrazinamide is particularly important because it penetrates the acidic environment within caseous granulomas, where Mycobacterium tuberculosis resides in a semi-dormant state.
Mnemonic
RIPE (Rifampicin, Isoniazid, Pyrazinamide, Ethambutol) — the four-drug intensive phase.
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