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Difficulty: HardDecision-Making Capacity

A 64-year-old man is admitted to the inpatient ward with a gangrenous right foot ulcer and early signs of systemic inflammatory response syndrome. Intravenous broad-spectrum antibiotics are initiated, but the necrotizing infection continues to progress rapidly. The vascular surgery team evaluates the patient and strongly recommends an urgent below-the-knee amputation to prevent overwhelming, fatal sepsis. The patient adamantly refuses the procedure. His past medical history is significant for vascular dementia, hypertension, and type 2 diabetes mellitus. On examination, he is oriented to person and place but not to time. When asked to explain his understanding of the situation, the patient states, "You doctors want to cut off my leg because of this black sore." When asked what will happen if the surgery is not performed, he replies, "Nothing will happen. It's just a scratch. I will walk out of here tomorrow and go back to my job at the auto plant." Medical records indicate he retired from the auto plant 15 years ago due to cognitive decline. The patient's daughter, who is his legally designated healthcare proxy, is present at the bedside and states, "Please do whatever is necessary to save his life. I give full permission for the surgery." Which of the following is the most appropriate next step in management?

  1. Proceed with the amputation based on the daughter's consentAnswer
  2. B
    Respect the patient's refusal and transition to comfort care measures
  3. C
    Request a formal psychiatric consultation to determine decision-making capacity
  4. D
    Petition the local court to declare the patient legally incompetent
  5. E
    Perform the amputation immediately under the doctrine of emergency implied consent

Answer

Proceed with the amputation based on the daughter's consent.
The correct answer is to proceed with the amputation based on the daughter's consent. To refuse life-saving medical treatment, a patient must possess clinical decision-making capacity, which requires four elements: understanding the information, expressing a choice, appreciating the medical consequences, and reasoning logically. Although this patient can express a choice (refusing surgery) and has basic understanding (knows they want to cut off his leg), he clearly lacks *appreciation* and *reasoning*. He does not appreciate the fatal consequence of his infection and incorrectly reasons he will return to a job he retired from years ago due to his dementia. Because he lacks capacity, his legally designated healthcare proxy (his daughter) assumes decision-making authority. Her consent allows the surgical team to legally and ethically proceed with the operation.

Step-by-Step Solution

1
Assess the patient's clinical decision-making capacity.
The patient demonstrates understanding but lacks appreciation of the consequences and reasoning, as evidenced by his belief that his gangrenous foot is a 'scratch' and he will return to a job he retired from years ago.
A patient must possess all four pillars of capacity (understanding, expressing a choice, appreciation, reasoning) to refuse life-saving treatment.
2
Determine the appropriate decision-maker.
The patient lacks capacity, so decision-making authority transfers to his legally designated healthcare proxy (his daughter).
When a patient is deemed to lack clinical capacity, medical decisions default to the designated surrogate decision-maker.
3
Select the next best step in management.
The surgical team should proceed with the amputation.
The designated proxy has provided explicit informed consent for the recommended life-saving procedure.

Key Concept

Decision-Making Capacity and Surrogate Consent
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Topics

Decision-Making Capacity

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