Heart Transplant Logistics #1: Coordinating Donor Heart Procurement and Recipient Implantation

1. One Transplant, Two Simultaneous Operations

Orthotopic heart transplantation is not a single operation performed in one operating room. It is a synchronized process involving two geographically separated surgical teams: the donor-heart procurement team and the recipient implantation team. Both teams must function within a shared timeline that also includes anesthesiology, perfusion, transplant cardiology, the organ-procurement organization, blood bank, laboratory services, transportation personnel, and intensive care.

The central logistical challenge is to prepare the recipient sufficiently early for immediate implantation while avoiding premature irreversible steps before the donor heart has been definitively accepted. Conversely, delayed recipient preparation may leave the donor heart waiting in cold storage, unnecessarily prolonging ischemic time.

The procurement team must:

• Confirm donor-heart suitability.
• Coordinate with other organ-procurement teams.
• Arrest and explant the donor heart safely.
• Preserve adequate vascular and atrial tissue.
• Package and transport the graft.
• Communicate continuously with the recipient center.

Simultaneously, the implantation team must:

• Induce anesthesia and establish invasive monitoring.
• Perform sternotomy or redo sternotomy.
• Dissect mediastinal structures.
• Establish cardiopulmonary bypass.
• Prepare the recipient anatomy.
• Perform native cardiectomy.
• Implant and reperfuse the donor heart.

The objective is not merely to minimize travel time. It is to align donor cross-clamping, transportation, recipient cardiectomy, implantation, and reperfusion so that the graft reaches the operating room precisely when the recipient is ready.

2. Ischemic Time as the Central Operational Constraint

Graft ischemic time is one of the most important modifiable determinants of early allograft function. It conventionally begins when the donor aorta is cross-clamped and coronary perfusion ceases and ends when the recipient aortic cross-clamp is released and coronary reperfusion is restored.

Large registry analyses demonstrate that the effect of ischemic time is continuous rather than binary. Increasing ischemic time is associated with worsening survival, and the adverse effect becomes more pronounced with increasing donor age. In an international cohort of 83,761 adult heart transplants, ischemic time of at least four hours was associated with progressively higher mortality, particularly when the donor was older than 40 years and most markedly when the donor was 60 years or older [1].

The commonly used four-hour threshold should therefore be interpreted as an operational target rather than an absolute biological boundary. A graft does not suddenly become unusable at four hours, nor is every graft exposed to less than four hours of ischemia equally protected. The clinical effect depends on the interaction between:

• Donor age and myocardial reserve
• Baseline ventricular function
• Donor hemodynamic instability
• Catecholamine requirements
• Recipient pulmonary vascular resistance
• Recipient preoperative instability
• Implantation complexity
• Preservation method
• Reperfusion conditions
• Total implantation and reperfusion duration

Prolonged ischemic time contributes to ischemia–reperfusion injury, myocardial edema, impaired calcium handling, endothelial dysfunction, microvascular injury, reduced ventricular compliance, and impaired systolic and diastolic function. Echocardiographic studies have demonstrated worse early allograft systolic and diastolic performance with prolonged graft ischemia, particularly when combined with higher donor age [2].

3. Primary Graft Dysfunction and Early Outcomes

Primary graft dysfunction is a severe manifestation of early allograft failure that occurs within the first 24 hours after transplantation and cannot be explained by hyperacute rejection, pulmonary hypertension alone, or a surgically correctable technical problem. It may predominantly affect the left ventricle, the right ventricle, or both ventricles.

Ischemic exposure is a recognized contributor to primary graft dysfunction. In a United Kingdom national study, primary graft dysfunction occurred in approximately 36% of recipients. Donor age and implantation time were independent risk factors, and 30-day mortality was substantially higher among patients who developed primary graft dysfunction than among those who did not [3]. Another adult cohort reported primary graft dysfunction in approximately 31% of recipients and identified ischemic time as an independent risk factor. Early mortality was also higher in affected patients [4].

The relationship is clinically important because primary graft dysfunction may require:

• High-dose vasoactive support
• Prolonged cardiopulmonary bypass
• Delayed sternal closure
• Intra-aortic balloon support in selected adults
• Temporary ventricular assist support
• Venoarterial extracorporeal membrane oxygenation
• Prolonged mechanical ventilation
• Renal replacement therapy
• Extended intensive care

Logistical decisions made several hours earlier at the donor hospital may therefore determine whether the recipient separates readily from cardiopulmonary bypass or develops severe postoperative circulatory failure.

4. Constructing the Timeline Backward From Reperfusion

Transplant planning is most reliable when the teams work backward from the intended time of recipient aortic cross-clamp release.

For example:

• Donor cross-clamp: 13:00
• Donor-hospital departure: 13:30
• Flight departure: 14:00
• Arrival at the destination airport: 15:00
• Arrival at the recipient hospital: 15:30
• Implantation begins: 15:30
• Recipient cross-clamp release: 16:30

This produces a total graft ischemic time of approximately 210 minutes, or 3.5 hours.

The total interval can be divided operationally into:

1. Procurement interval: donor cross-clamp to completed explantation and packaging.
2. Transportation interval: departure from the donor operating room to arrival in the recipient operating room.
3. Implantation interval: graft handover and preparation through recipient cross-clamp release.
4. Reperfusion interval: early coronary reperfusion, rewarming, rhythm recovery, and preparation for separation from cardiopulmonary bypass.

Each component must be estimated realistically. A one-hour flight does not represent a one-hour transport interval. Ground transportation, airport access, aircraft loading, security procedures, weather, elevator transport, and operating-room handover may add substantial time.

5. Predeparture Planning by the Procurement Team

Before leaving the recipient hospital, the procurement surgeon should review all available donor information and identify questions requiring direct assessment.

The review should include:

• Donor age, weight, height, and blood group
• Donor–recipient size relationship
• Cause and mechanism of death
• Hemodynamic stability
• Vasoactive and inotropic requirements
• Echocardiographic ventricular function
• Valve morphology and function
• Septal and great-vessel anatomy
• Pericardial abnormalities
• Coronary anatomy when available
• Arterial blood gases and metabolic status
• Renal, hepatic, and infectious data
• Resuscitation history
• Expected participation of other organ teams
• Recipient-specific requirements for additional donor tissue

The team should also confirm the transport route, anticipated departure and arrival times, backup transportation, contact numbers, preservation equipment, cardioplegia supplies, sterile packaging, labels, and documentation.

In congenital heart transplantation, the procurement surgeon should review the recipient anatomy before departure. The required tissue may differ substantially from that needed for a routine adult bicaval transplant.

6. Donor Heart Visualization and Final Acceptance

Donor acceptance is usually provisional before the procurement team travels. Final acceptance occurs after integration of the available clinical data with direct operative assessment.

During visualization, the procurement surgeon evaluates:

• Global and regional ventricular contraction
• Right- and left-ventricular distension
• Epicardial appearance
• Myocardial contusion or discoloration
• Coronary origin and proximal course
• Palpable coronary calcification in older donors
• Cardiac size relative to the recipient
• Great-vessel anatomy
• Valve or septal abnormalities
• Evidence of prior cardiac surgery
• Required vessel and atrial-cuff length

Abnormal ventricular appearance must be interpreted in context. Right-ventricular distension may result from donor volume status, ventilation, pulmonary vascular resistance, or surgical manipulation rather than intrinsic myocardial dysfunction. Direct inspection should therefore be correlated with echocardiography, hemodynamics, vasoactive support, and the response to donor optimization.

Once the heart is considered suitable, the procurement surgeon should communicate a structured message to the recipient team: “The heart is acceptable.”

This statement should confirm that the donor anatomy and function are acceptable and that no unexpected technical finding prevents transplantation. Any residual concern should be communicated explicitly. A binary acceptance message should not conceal uncertainty regarding ventricular function, coronary anatomy, vessel length, contusion, or size mismatch.

7. Timing the Recipient Skin Incision

The recipient may enter the operating room before final donor visualization because induction, vascular access, monitoring, positioning, preparation, and draping require time. However, the timing of skin incision should be individualized.

In a stable recipient undergoing primary sternotomy, incision may be delayed until the donor heart has been directly visualized and accepted. In contrast, early incision is often necessary when the recipient has:

• Multiple previous sternotomies
• Dense mediastinal adhesions
• A ventricular assist device
• Previous Glenn or Fontan palliation
• Extensive systemic-to-pulmonary collaterals
• Reconstructed pulmonary arteries
• A reconstructed aortic arch
• Intracardiac or vascular conduits
• Complex systemic or pulmonary venous anatomy

These patients may require several hours of dissection before native cardiectomy. Waiting until donor cross-clamping to begin recipient exposure would markedly prolong graft ischemia.

The implantation team must nevertheless define a clear point of no return. Irreversible native cardiectomy, device explantation, or division of essential vascular structures should not proceed until donor acceptance and transport feasibility have been confirmed.

8. Recipient Readiness Before Donor Cross-Clamping

The donor aortic cross-clamp starts the conventional ischemic clock. It should therefore be authorized only after communication with the implantation team.

Before approving donor cross-clamping, the recipient surgeon should confirm that:

• The donor heart remains accepted.
• The recipient operation is progressing as expected.
• Cardiopulmonary bypass can be established safely.
• Major adhesions and vascular structures have been controlled.
• Required blood products are available.
• No new immunologic or infectious contraindication has emerged.
• The expected transport time remains realistic.
• The projected total ischemic time is acceptable.
• The recipient can be ready for implantation when the graft arrives.

The message “The proposed aortic cross-clamp time is acceptable” is therefore a reciprocal authorization from the recipient team to the procurement team.

If recipient dissection is delayed, donor cross-clamping may need to be postponed. If donor instability requires urgent procurement, the recipient operation may need to accelerate. Accurate communication is more valuable than maintaining an outdated schedule.

9. Donor Cardiectomy and Tissue Preservation

After systemic heparinization and coordination with the other organ teams, the donor aorta is cross-clamped and cardioplegia is administered. Rapid cardioplegic arrest, effective ventricular decompression, and homogeneous myocardial cooling are essential.

The donor heart should be explanted with sufficient:

• Left atrial cuff
• Superior vena caval length
• Inferior vena caval length
• Main and branch pulmonary artery tissue
• Ascending aorta
• Aortic arch tissue when required
• Additional systemic venous tissue for reconstruction

Premature trimming should be avoided. Excess tissue can be removed at the recipient hospital, whereas inadequate tissue may make reconstruction difficult or impossible.

This is particularly important in congenital recipients. Previous cavopulmonary connections, anomalous systemic venous return, pulmonary-artery discontinuity, situs abnormalities, prior Norwood reconstruction, or prosthetic conduits may require nonstandard vascular reconstruction.

In multi-organ procurement, the cardiac surgeon must coordinate dissection, heparinization, aortic cross-clamping, preservation perfusion, and organ removal with the lung and abdominal procurement teams. The goal is to preserve donor-heart quality without compromising the recovery of other organs.

10. Packaging, Transportation, and Continuous Updates

With static cold preservation, the graft is placed in cold preservation solution, enclosed in sequential sterile containers, labeled, and maintained under controlled hypothermic conditions. The myocardium should not be placed in direct contact with ice.

The procurement team should document and communicate:

• Donor cross-clamp time
• Cardioplegia administration time
• Completion of explantation
• Packaging time
• Departure from the donor hospital
• Airport arrival
• Flight departure
• Flight arrival
• Ground-transport departure
• Estimated recipient-hospital arrival

Updates should be transmitted when delays become probable, not after the expected arrival time has passed.

The recipient team should revise its operative pace according to the actual transport status. If the graft is delayed, native cardiectomy may need to be deferred. If the graft arrives early, the recipient team should avoid leaving it unnecessarily in the operating room while dissection continues.

11. Heart Handover

The handover from the procurement team to the implantation team is a formal clinical transfer.

The teams should verify:

• Donor identity
• Blood-group compatibility
• Documentation and labeling
• Packaging integrity
• Preservation solution and method
• Donor cross-clamp time
• Donor-heart anatomy
• Ventricular function
• Coronary concerns
• Cardioplegia delivery
• Atrial-cuff and vessel lengths
• Procurement-related injury
• Unexpected findings
• Current ischemic time

Handover should use closed-loop communication. Critical information is stated by the procurement surgeon, repeated by the receiving surgeon, and confirmed.

The graft should then be inspected on the back table. Additional preparation may include trimming, closure of a patent foramen ovale, repair of a procurement injury, removal of excess left atrial tissue, and preparation of the great vessels.

12. Implantation and Coronary Reperfusion

The implantation sequence depends on recipient anatomy and the selected technique. In a standard bicaval transplant, the left atrial anastomosis is generally followed by the inferior vena cava, pulmonary artery, aorta, and superior vena cava, although the order may be modified according to exposure and surgeon preference.

The implantation interval includes more than anastomotic suturing. It also includes:

• Graft inspection and trimming
• Recipient vascular preparation
• Size-mismatch management
• Additional reconstruction
• De-airing
• Rewarming
• Hemostasis
• Preparation for reperfusion

Anastomotic efficiency is important, but speed must not compromise geometry. Technical problems may include caval obstruction, pulmonary-artery kinking, left atrial distortion, aortic tension, donor–recipient size mismatch, and anastomotic bleeding.

When the recipient aortic cross-clamp is removed, coronary reperfusion begins. This is more precise than stating that “cardiac perfusion resumes,” because systemic perfusion may already be maintained by cardiopulmonary bypass.

The graft is reperfused, de-aired, rewarmed, and assessed for:

• Spontaneous rhythm
• Need for pacing or defibrillation
• Left- and right-ventricular function
• Valve competence
• Regional wall-motion abnormality
• Anastomotic obstruction
• Intracardiac air
• Pulmonary-artery pressure
• Ability to separate from bypass

The duration of reperfusion is itself clinically relevant. Prolonged implantation and reperfusion intervals have been associated with adverse outcomes and may reflect technical complexity, myocardial dysfunction, bleeding, or difficulty separating from bypass [5].

13. Pediatric and Congenital Considerations

Pediatric data support minimizing ischemic time but also demonstrate that its effect is modified by contemporary preservation and patient selection. In a United States cohort of 4,716 pediatric transplants, graft ischemic time beyond 3.5 hours was associated with approximately a 30% increase in the risk of graft loss during the first six months after transplantation [6].

More recent pediatric experience has suggested that prolonged ischemic time may be tolerated in carefully selected recipients when modern preservation, transport, and perioperative strategies are used [7]. These observations should not be interpreted as evidence that ischemic time is unimportant. Rather, they suggest that risk depends on the interaction between ischemic duration, donor quality, preservation strategy, recipient condition, and institutional expertise.

Congenital recipients often require longer dissection and reconstruction than recipients with structurally normal hearts. Examples include:

• Dismantling a Fontan pathway
• Reconstructing central pulmonary arteries
• Restoring systemic venous continuity
• Managing bilateral superior venae cavae
• Reconstructing an interrupted or previously reconstructed aortic arch
• Addressing situs abnormalities
• Removing ventricular assist devices or conduits
• Controlling extensive collateral vessels

The projected implantation time must therefore incorporate reconstructive complexity rather than relying solely on transport distance.

14. Preventable Logistical Failures

Common preventable failures include:

• Incomplete donor assessment
• Premature recipient cardiectomy
• Delayed recipient dissection
• Uncoordinated donor cross-clamping
• Inaccurate transport estimates
• Inadequate donor vessel length
• Poor communication during delays
• Incomplete handover
• Incorrect ischemic-time documentation
• Delayed graft preparation
• Prolonged implantation caused by inadequate preoperative planning

A robust workflow uses explicit checkpoints:

1. Before procurement-team departure: provisional acceptance and transport feasibility.
2. After donor visualization: final anatomic and functional acceptance.
3. Before donor cross-clamp: confirmation of recipient readiness.
4. After donor explantation: immediate communication of cross-clamp and departure times.
5. During transport: continuous revision of the arrival estimate.
6. Before graft arrival: completion of recipient preparation.
7. At handover: confirmation of identity, anatomy, preservation, and timing.
8. Before reperfusion: review of anastomoses, de-airing, and hemodynamic strategy.

15. Core Principle

Successful heart transplantation requires two distant operating rooms to function as a single coordinated surgical system.

The donor team should not initiate ischemia without understanding recipient readiness. The recipient team should not perform irreversible cardiectomy without confirmation of donor suitability and transport feasibility. Both teams must continuously revise the plan according to donor findings, recipient progress, transportation status, and the projected implantation interval.

The target is not simply “less than four hours.” The target is the shortest safely achievable ischemic interval for that specific donor, recipient, preservation method, transport route, and reconstructive complexity.

References

[1] Jernryd V, Stehlik J, Metzsch C, Lund LH, Smith JG, Andersson B, Perez R, Nilsson J. Donor age and ischemic time in heart transplantation—implications for organ preservation. J Heart Lung Transplant. 2024. doi:10.1016/j.healun.2024.10.030.

[2] Rustad LA, Nytrøen K, Andreassen A, Geiran O, Endresen K, Gullestad L, Aakhus S, Amundsen BH. Heart transplant systolic and diastolic function is impaired by prolonged pretransplant graft ischaemic time and high donor age: an echocardiographic study. Eur J Cardiothorac Surg. 2013. doi:10.1093/ejcts/ezt233.

[3] Avtaar Singh SA, Banner N, Rushton S, Simon A, Berry C, Al-Attar N. ISHLT primary graft dysfunction incidence, risk factors, and outcome: a UK national study. Transplantation. 2019. doi:10.1097/TP.0000000000002220.

[4] Nicoara A, Ruffin D, Cooter M, Patel C, Thompson A, Schroder J, Daneshmand M, Hernandez AF, Rogers J, Podgoreanu M, Swaminathan M, Kretzer A, Stafford-Smith M, Milano C, Bartz RR. Primary graft dysfunction after heart transplantation: incidence, trends, and associated risk factors. Am J Transplant. 2018. doi:10.1111/ajt.14588.

[5] Jernryd V, Metzsch C, Andersson B, Nilsson J. The influence of ischemia and reperfusion time on outcome in heart transplantation. Clin Transplant. 2020. doi:10.1111/ctr.13840.

[6] Ford M, Almond C, Gauvreau K, Piercey G, Blume E, Smoot L, Fynn-Thompson F, Singh T. Association of graft ischemic time with survival after heart transplant among children in the United States. J Heart Lung Transplant. 2011. doi:10.1016/j.healun.2011.05.001.

[7] Oliver S, Conway J, Khoury M, Eurich D, Dubois C, Bedard K, Urschel S, Pidborochynski T, West LJ, Al-Aklabi M, Jonker D, Freed DH. Post-transplant outcomes with prolonged donor heart ischemic time in the pediatric population. Am J Transplant. 2025. doi:10.1016/j.ajt.2025.12.002.