Pa of ethambutol in RNTCP regime ?
**Core Concept**
Ethambutol is a first-line antitubercular medication used in the treatment of tuberculosis (TB) under the Revised National Tuberculosis Control Programme (RNTCP) in India. It acts by inhibiting the synthesis of the bacterial cell wall, specifically by inhibiting arabinosyl transferases, which are essential for the synthesis of arabinogalactan, a key component of the mycobacterial cell wall.
**Why the Correct Answer is Right**
Ethambutol is indeed a crucial component of the RNTCP regime, used in combination with other antitubercular medications such as rifampicin, isoniazid, and pyrazinamide. The combination of these medications is designed to target different aspects of TB pathogenesis, ultimately leading to the killing of the bacteria. Ethambutol's mechanism of action involves the inhibition of arabinosyl transferases, which disrupts the synthesis of the bacterial cell wall, ultimately leading to bacterial death.
**Why Each Wrong Option is Incorrect**
* **Option A:** Ethionamide is another antitubercular medication, but it is not a part of the standard RNTCP regime.
* **Option B:** Isoniazid is indeed a crucial component of the RNTCP regime, but it is not the correct answer as we are looking for the part of the regimen that specifies ethambutol.
* **Option C:** Pyrazinamide is also a part of the RNTCP regime, but it is not the correct answer as we are looking for the part of the regimen that specifies ethambutol.
**Clinical Pearl / High-Yield Fact**
The RNTCP regime is designed to treat TB in a standardized and effective manner, with the goal of reducing the incidence of multidrug-resistant TB. Ethambutol is an essential component of this regime, and its correct dosing and administration are critical to the success of TB treatment.
**Correct Answer: C. 2mg/kg per day, given in a single dose.**