A 45-year-old patient with schizophrenia refuses amputation for gas gangrene of his right foot. He says 'the hospital is trying to poison me.' The treating team requests a capacity assessment. Which component of decision-making capacity is SPECIFICALLY impaired in this case?
- A Understanding (comprehension of information)
- B Reasoning (working through consequences)
- C Appreciation (applying information to own situation — impaired by delusion) ✓
- D Expressing a choice
Explanation
The four components of decision-making capacity are: Understanding (comprehending information given), Appreciation (recognising how the information applies to oneself — this requires intact reality testing), Reasoning (comparing options and their consequences), and Communicating a choice. In this case, the delusion ('hospital is poisoning me') specifically impairs Appreciation — the patient cannot appreciate that his refusal stems from a pathological belief rather than rational assessment of the actual clinical situation. Appreciation is the component most vulnerable to psychotic illness. Capacity is specific to a decision; patients can lack capacity for one decision while retaining it for others.
Reference: Kaplan & Sadock's Synopsis of Psychiatry, 11th ed.
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Written and medically reviewed by the StethoPrep medical team.