Final answer:
The surrogate decision-maker must honor the patient's expressed wish to withdraw nutrition and hydration by medical means, as outlined in the patient's advance directive. Legal consultation or a psychiatric evaluation is not required for the surrogate, and the surrogate should not base the decision on personal values.
Step-by-step explanation:
When considering the case of a patient in an irreversible vegetative state with an advance directive, the patient's surrogate decision-maker must honor the patient's expressed wish to withdraw nutrition and hydration by medical means. The surrogate is expected to respect the patient's autonomy and previously stated decisions regarding end-of-life care, which may include do not resuscitate (DNR) orders or preferences concerning life-sustaining treatments. It's important to note that the surrogate does not need to consult with a lawyer, have a psychiatric evaluation, or impose their personal values in the decision-making process, as long as the patient's wishes are clear and documented.
The case of Terri Schiavo provides a significant example where the patient's expressed wishes can guide the surrogate's decisions despite external pressures or personal beliefs. Understanding and upholding a patient's advanced directive falls within the legal and ethical frameworks of patient rights and medical ethics, which underscore the importance of respecting a person's autonomy in healthcare decisions.