DOTS therapy under tuberculosis control is given for how long in standard cases?

AIIMS CRE 2025

Medical & Surgical Nursing

Easy

Appeared in: AIIMS CRE 2025

Explanation

The standard regimen for new, drug-susceptible TB cases is 6 months.
This is divided into a 2-month intensive phase with four drugs (Isoniazid, Rifampicin, Pyrazinamide, Ethambutol - HRZE).
This is followed by a 4-month continuation phase with two drugs (Isoniazid, Rifampicin - HR).
This two-phase approach ensures rapid bacterial killing and subsequent sterilization to prevent relapse and the development of drug resistance.

Option A: This only represents the initial, intensive phase of treatment, not the full course.
Option B: This represents the continuation phase of treatment, which follows the initial 2-month intensive phase.
Option D: This longer duration is not used for standard, uncomplicated cases of drug-susceptible TB.

Visual 1: Timeline Graphic - A horizontal bar chart showing the 6-month duration, clearly divided into a 2-month 'Intensive Phase' (with HRZE drugs listed) and a 4-month 'Continuation Phase' (with HR drugs listed).
Visual 2: Infographic - A summary of the DOTS strategy, highlighting the five key components: political commitment, case detection, standardized therapy, effective drug supply, and monitoring/evaluation.

Clinical Relevance

Nursing practice connection: Knowing Treatment duration for drug-susceptible Tuberculosis (TB) under the DOTS program helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Completing the full 6-month regimen is critical. Incomplete or irregular treatment is a primary cause of treatment failure and the emergence of multidrug-resistant TB (MDR-TB), which is much harder and more expensive to treat.
The nurse's role in DOTS is central to success. It involves directly observing the patient taking their medication (ensuring adherence), monitoring for and managing adverse drug reactions (e.g., hepatotoxicity from Isoniazid/Rifampicin/Pyrazinamide, optic neuritis from Ethambutol), and providing extensive patient education.
What if? If a patient with standard pulmonary TB shows a positive sputum culture at the end of the 2-month intensive phase, the continuation phase may be extended from 4 to 7 months, and the patient must be evaluated for potential drug resistance.

How to Approach the Question

First, identify the key terms in the question: 'DOTS therapy', 'tuberculosis', 'how long', and 'standard cases'. The term 'standard cases' is crucial as it excludes complicated or resistant forms of TB.
Recall the standard treatment protocol for drug-susceptible TB. Remember that it is a multi-phase treatment.
Differentiate between the duration of the individual phases (intensive and continuation) and the total duration of the entire regimen.
Evaluate the options: 2 months is the intensive phase, 4 months is the continuation phase, and 6 months is the total (2+4). 12 months is for non-standard cases. Select the option that represents the total duration for a standard case.

Concept Tested & Keywords

Concept Tested: Treatment duration for drug-susceptible Tuberculosis (TB) under the DOTS program.
Stem keywords: DOTS therapy, tuberculosis, how long, standard cases
Lead-in keywords: how long

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