According to RNTCP guidelines, what is the most common cause of treatment failure in newly diagnosed smear-positive pulmonary tuberculosis patients in India?

Explanation

## Most Common Cause of TB Treatment Failure in RNTCP **Key Point:** Non-adherence (poor compliance) to anti-TB therapy is the single most common cause of treatment failure in newly diagnosed smear-positive TB patients under RNTCP in India. ### Why Non-Adherence is the Leading Cause Non-adherence accounts for approximately 60–70% of all treatment failures in TB programs in India. This occurs due to: - **Socioeconomic factors:** Poverty, migration, lack of awareness - **Side effects:** Gastrointestinal disturbances, hepatotoxicity, peripheral neuropathy - **Complexity of regimen:** 4-drug intensive phase followed by 2-drug continuation phase - **Lack of supervision:** Inadequate DOTS (Directly Observed Therapy) coverage in some areas - **Patient factors:** Symptom relief after 2–3 weeks leading to premature stoppage ### Comparative Frequency of Other Causes | Cause | Frequency | Notes | | --- | --- | --- | | Non-adherence | 60–70% | Most common; preventable | | MDR-TB (primary resistance) | 2–3% | Present at baseline; not a cause of failure per se | | Malabsorption | 5–10% | Less common; seen in diarrhea, HIV, GI surgery | | HIV co-infection | 5–8% | Increases failure risk but not the primary cause | **Clinical Pearl:** RNTCP emphasizes DOTS (Directly Observed Therapy) as the cornerstone strategy to combat non-adherence. A health worker observing the patient swallow each dose dramatically improves cure rates. **High-Yield:** Treatment failure is defined as: - Sputum smear or culture positive at 5 months or later during treatment - Bacteriological relapse after completion of treatment **Mnemonic: DOTS** — **D**irectly **O**bserved **T**herapy **S**upervised (the intervention that prevents non-adherence) [cite:Park 26e Ch 9]