In the natural history of a chronic disease, the 'critical point' is best defined as:
- A The moment symptoms first become noticeable to the patient
- B The point beyond which treatment can no longer prevent death or permanent disability ✓
- C The time when the pathogen first enters the host
- D The stage at which the disease becomes communicable to contacts
Correct answer: B. The point beyond which treatment can no longer prevent death or permanent disability
Explanation
The critical point is the juncture in the natural history after which the disease process becomes irreversible and intervention can no longer avert death or serious residual damage. Early diagnosis and treatment are worthwhile only if they act before this point, which is why the position of the critical point determines whether screening can alter outcome. Symptom onset defines the clinical horizon, not the critical point.
Reference: Park's Textbook of Preventive and Social Medicine, 27th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.