Can Epinephrine Infusion Be Used in Brain-Dead Donors for Organ Harvesting?
Yes, epinephrine can be used in brain-dead donors, but it should be rapidly tapered off in favor of dopamine or dobutamine, and ideally combined with vasopressin to minimize the required epinephrine dose and optimize organ viability.
Guideline-Based Approach
The UNOS consensus guidelines 1 provide a clear algorithmic approach to vasopressor management in brain-dead donors:
Initial Hemodynamic Management
- Target mean arterial pressure ≥60 mmHg
- Norepinephrine and epinephrine should be tapered off rapidly in favor of dopamine or dobutamine 1
- Target dopamine <10 µg/kg/min or dobutamine <10 µg/kg/min
- The rationale: high-dose β-agonists and other inotropes increase myocardial oxygen demand and deplete the myocardium of high-energy phosphates, potentially compromising cardiac graft viability
Hormonal Resuscitation Strategy
When left ventricular ejection fraction is <45% or hemodynamic instability persists, implement aggressive management with 1:
- Arginine vasopressin: 1-U bolus, then 0.5-4 U/h infusion (titrated to systemic vascular resistance 800-1200 dyne·s⁻¹·cm⁻⁵)
- Triiodothyronine (T₃): 4-µg bolus, then 3 µg/h infusion
- Methylprednisolone: 15 mg/kg bolus
Evidence-Based Rationale
Why Minimize Epinephrine?
Research demonstrates that high-dose epinephrine can be detrimental to organ viability 2. A rat model study showed that high-dose epinephrine administration caused catecholamine-induced hypoxic stress in liver grafts, while combined administration of epinephrine and vasopressin at optimal doses preserved liver viability 2.
The Vasopressin Advantage
Combining vasopressin with low-dose epinephrine dramatically improves hemodynamic stability while preserving organ function 3. In a clinical study, brain-dead patients receiving epinephrine alone survived only 24.1±17.2 hours, while those receiving combined vasopressin and epinephrine (requiring only ≤0.5 mg/hr epinephrine) survived 23.1±19.1 days 3. This approach allows for:
- Minimal epinephrine dosing
- Prolonged hemodynamic maintenance
- Better organ preservation
- Increased transplantation opportunities
Organ-Specific Considerations
Dopamine may be preferable for liver procurement 4. A 2025 study of 102 brain-dead donors found significantly higher liver procurement rates with dopamine-predominant therapy (98.5%) versus norepinephrine-predominant therapy (80.0%), with dopamine better alleviating anaerobic metabolism 4.
However, dopamine and norepinephrine can impair renal perfusion 5. A 2000 animal study demonstrated that while dopamine and norepinephrine increased blood pressure and endocardial flow, they reduced renal cortical flow. In contrast, epinephrine improved all hemodynamic parameters while maintaining renal perfusion 5.
Clinical Algorithm
- Initial stabilization: Use epinephrine if necessary to achieve MAP ≥60 mmHg
- Rapid transition: Taper epinephrine quickly, switching to dopamine (<10 µg/kg/min) or dobutamine (<10 µg/kg/min)
- Add vasopressin: Initiate vasopressin infusion (0.5-4 U/h) to reduce catecholamine requirements
- Optimize volume status: Target CVP 6-10 mmHg before escalating vasopressors
- Consider hormonal resuscitation: If LVEF <45% or persistent instability, add T₃ and methylprednisolone per protocol 1
Critical Pitfalls to Avoid
- Do not rely on high-dose epinephrine alone: This depletes myocardial energy stores and may compromise cardiac grafts 1
- Do not use epinephrine without considering vasopressin: The combination allows minimal catecholamine dosing while maintaining hemodynamic stability 3
- Monitor for extravasation: Epinephrine can cause tissue necrosis; check infusion sites frequently and use central access 6
- Avoid prolonged high-dose catecholamines: They may reduce renal graft viability through impaired perfusion 5
FDA Safety Considerations
Per FDA labeling 6, epinephrine infusion carries risks of:
- Cardiac arrhythmias and myocardial ischemia
- Pulmonary edema from increased cardiac output and peripheral vasoconstriction
- Renal impairment from renal vasoconstriction
- Tissue necrosis with extravasation
These risks underscore the guideline recommendation to minimize epinephrine use in favor of alternative agents combined with vasopressin.