About This Page
This is a clinician-written, evidence-based summary aligned to the USMLE Step 2 CK Content Outline. It is intended for medical students preparing for USMLE Step 2 CK. Management reflects current ACC/AHA, USPSTF, and APA guidelines. Always cross-reference with UpToDate, institutional protocols, and clinical judgment.
The Bottom Line
- Advance directives guide future decisions when a patient lacks capacity; current capacitated wishes override prior directives
- DNR/DNI applies to CPR or intubation, not to all treatment, comfort care, antibiotics, fluids, or hospitalization unless specified
- Withholding and withdrawing life-sustaining treatment are ethically equivalent
- A health care proxy makes decisions using substituted judgment first, then best interests
- POLST/MOLST forms are portable medical orders intended for seriously ill or frail patients, not general planning forms for all adults
Overview
Advance care planning allows patients to express values, goals, treatment preferences, and surrogate choices before they lose decision-making capacity. Common tools include living wills, durable power of attorney for health care, DNR/DNI orders, and POLST or MOLST forms. End-of-life ethics on Step 2 CK focuses on respecting patient autonomy, clarifying goals of care, relieving suffering, and avoiding the misconception that a DNR order means withdrawal of all medical care.
Legal and Ethical Framework
A capacitated adult may refuse or discontinue any medical intervention, including ventilation, dialysis, vasopressors, artificial nutrition, hydration, chemotherapy, or CPR. When capacity is absent, clinicians should look for advance directives and engage the legally authorized surrogate. Withholding and withdrawing treatment are ethically equivalent when the intervention no longer achieves the patient goals or desired quality of life. Palliative care should be offered early and is compatible with disease-directed treatment.
When This Issue Arises
Symptoms
Patient with terminal cancer, advanced dementia, severe stroke, end-stage heart failure, or ICU multiorgan failure has uncertain goals of care
Family asks to reverse a DNR order during hospitalization despite a clear patient directive
Patient requests withdrawal of ventilatory support, dialysis, feeding tube, or vasopressors
Patient has a POLST/MOLST form that conflicts with family preferences
Team assumes DNR means no antibiotics, no fluids, or no surgery
Signs
Documented living will, health care proxy, DNR/DNI order, or POLST/MOLST in the medical record
Surrogate can describe prior patient statements and values
Conflict between surrogates, clinicians, or written directives
Symptoms requiring palliation: pain, dyspnea, agitation, nausea, secretions, anxiety
Potentially reversible condition being mistaken for terminal decline
Assessment Steps
First-line
Determine current capacityIf the patient has capacity now, their contemporaneous decision overrides a prior advance directive
Identify documents and ordersLook for living will, health care proxy, durable power of attorney for health care, DNR/DNI order, POLST/MOLST, and state-specific forms
Clarify the scopeSpecify CPR, intubation, hospitalization, ICU transfer, vasopressors, dialysis, artificial nutrition, antibiotics, and comfort-focused care separately
Second-line
Goals-of-care conversationAsk what outcomes the patient would find acceptable, what burdens are unacceptable, and what tradeoffs align with their values
Prognostic communicationUse plain language and avoid false certainty; frame decisions around likely benefits and burdens
Palliative symptom assessmentAssess pain, dyspnea, delirium, anxiety, secretions, nausea, spiritual distress, and family support needs
Specialist
Palliative care consultAppropriate for serious illness, complex symptom burden, or difficult goals-of-care discussions
Ethics consultUse for disputes, unclear surrogate authority, medically ineffective interventions, or suspected conflict of interest
Decision-Making Algorithm
AMA Code of Medical Ethics: Advance Directives, DNAR Orders, and Withholding or Withdrawing Life-Sustaining Treatment1
If the patient has capacity
- Ask the patient directly about goals, acceptable outcomes, and treatment preferences
- Offer disease-directed, life-prolonging, and comfort-focused options when medically appropriate
- Honor refusal or withdrawal requests after confirming understanding and voluntariness
- Document code status and scope of treatment in specific medical orders
2
If capacity is absent
- Follow a valid advance directive or POLST/MOLST order if applicable
- Engage the appointed health care proxy or legally authorized surrogate
- Use substituted judgment based on prior statements, values, religious commitments, and life story
- Use best interests only when patient preferences are unknown
3
DNR/DNI handling
- DNR means no chest compressions, defibrillation, or resuscitation during cardiac arrest unless otherwise specified
- DNI means no intubation, but may allow noninvasive ventilation, oxygen, antibiotics, vasopressors, or ICU care if consistent with goals
- Do not suspend DNR automatically for surgery; discuss perioperative risks and patient goals
- Continue comfort care, analgesia, anxiolysis, and dignity-focused care regardless of code status
4
Withdrawal of life support
- Withholding and withdrawal are ethically equivalent when consistent with patient preferences or best interests
- Provide adequate opioids and sedatives for dyspnea, pain, or distress; intent is symptom relief, not hastening death
- Offer family presence, spiritual care, and bereavement support
- Document rationale, participants, and agreed plan clearly
Common Pitfalls
- DNR is not do not treat: It only limits resuscitation unless the order says more.
- Prior directive vs current wishes: A capacitated current patient overrides an old written directive.
- Withdrawing treatment is not euthanasia: The underlying disease causes death; the clinician respects the patient decision.
- Family cannot override clear patient wishes: The surrogate represents the patient values, not their own preferences.
- POLST/MOLST: This is a medical order for seriously ill patients, not a replacement for broader advance care planning.
USMLE Step 2 CK Exam Tips
- 1DNR patient develops pneumonia: do not withhold antibiotics automatically; ask what treatment goals and orders specify
- 2Current capacitated refusal beats family objections and prior paperwork
- 3Withholding and withdrawing ventilation are ethically equivalent
- 4Morphine for terminal dyspnea is appropriate if the intent is symptom relief, even if respiratory rate decreases
- 5Health care proxy uses substituted judgment, not personal preference
- 6A living will guides care only when the patient lacks capacity
- 7Do not call ethics before first clarifying the patient values and existing directives
- 8DNR is not automatically suspended in the operating room; discuss and document perioperative code status
practicetest your knowledge on advance directives & end-of-life careApply what you've learnt with USMLE Step 2 CK-style questions from the iatroX Q-Bank — ethics & law and beyond.
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