Simultaneous thoracic and abdominal donation after circulatory death organ recovery: the abdominal surgeon's perspective : Current Opinion in Organ Transplantation

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Simultaneous thoracic and abdominal donation after circulatory death organ recovery: the abdominal surgeon's perspective

Thiessen, Carriea,∗; Wisel, Steven A.b,∗; Roll, Garrett R.c

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Current Opinion in Organ Transplantation ():10.1097/MOT.0000000000001045, January 04, 2023. | DOI: 10.1097/MOT.0000000000001045
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  • PAP

Abstract

KEY POINTS

  • Combined thoracic and abdominal donation after circulatory death (DCD) procurements will become increasingly common in the United States.
  • Collection of donor blood for cardiac normothermic perfusion pump increases donor warm ischemic time, with potential for increased injury to abdominal organs.
  • Several strategies and technical modifications may be implemented to optimize joint DCD procurements and graft outcomes.

INTRODUCTION

Although cadaveric donation was first achieved by cardiopulmonary declaration criteria, donation after circulatory death (DCD) procurement fell out of practice during the late 1970 s due to poor recipient outcomes, developments in neurosciences, and a shifting ethical understanding of the definition of death [1]. Interest in DCD procurement was renewed in the 1990s as the demand for organs and wait times for transplant surged. The University of Pittsburgh Medical Center developed a DCD protocol in 1992 and the Institute of Medicine authored reports on DCD donation in 1997 and 2000 [2–4]. Since 2007, the number of DCD procurements in the United States steadily increased [5]; in 2019, DCD donors comprised 22% of deceased organ procurements [5].

Heart allografts from DCD donors were historically not utilized due to concerns of organ injury and ethical considerations. In the United States, this practice changed with the initiation of the Donors After Circulatory Death Heart Trial in 2019, a prospective, randomized trial comparing 6-month survival for recipients of brain-death donor (DBD) hearts preserved in standard cold storage versus DCD hearts preserved with the TransMedics Organ Care System (OCS) Heart pump. Other studies have employed normothermic regional perfusion in DCD heart procurement [6]. DCD heart transplant outcomes using these approaches are promising [6,7].

Given increasing utilization of abdominal organs from DCD donors and the emerging use of DCD hearts, joint thoracic-abdominal organ procurements are standard practice in the United Kingdom and Australia, and are becoming increasingly common in the United States. Such joint procurements pose unique operative and logistical challenges. We have discussed some of the ethical considerations raised by joint DCD procurements elsewhere [8▪]. In this article, we explore ways abdominal transplant teams, cardiac transplant teams, and organ procurement organizations (OPOs) can adapt current procurement practices to optimize outcomes for recipients of all of these organs.

CHANGES TO THE ABDOMINAL ORGAN DCD PROCEDURE REQUIRED FOR JOINT DCD PROCUREMENTS

The abdominal organ DCD procurement is finely choreographed to minimize the time to initiation of cold aortic flush, thereby decreasing abdominal organ warm ischemia time. The team begins by making a midline exploratory laparotomy for immediate cannulation of the common iliac artery or distal abdominal aorta. The expected time from incision to cold flush is 1–3 min, followed by rapid external cooling with ice. In the absence of a thoracic team, abdominal surgeons perform a median sternotomy immediately after cannulation, providing thoracic access to drain the venous blood at the cavo-atrial junction and cross-clamp the descending thoracic aorta. The organs are then removed, and the hepatectomy time is typically under 30 min, with an additional 5–10 min for bilateral nephrectomy.

The addition of a heart or lung procurement alters this DCD approach. DCD heart procurements require collection of approximately 1.5 l of donor whole blood to prime the cardiac pump. While donor blood is collected, initiation of abdominal flush is postponed, adding to warm ischemia time. In the US experience during the Donors After Circulatory Death Heart Trial, blood was collected via cannulation of the right atrial appendage. Some authors estimate that approximately 90–120 s are required for passive drainage of the requisite blood volume [9▪▪], although in practice, collection of donor blood can require up to 5 min to collect sufficient volume for the perfusion pump [7,9▪▪].

IMPACT OF JOINT DONATION AFTER CIRCULATORY DEATH PROCUREMENTS ON ABDOMINAL ORGANS

The modifications to successfully accomplish joint DCD procurements raise a theoretical risk for increasing organ ischemia through a combination of delay in initiation of abdominal flush and prolonged hepatectomy and nephrectomy times. Although the impact on abdominal organ quality and utilization are not currently known, the effects of ischemia should be considered as joint DCD procurements become standard of care in the United States.

Warm ischemic time

The overall risk of organ ischemic injury during a procurement is a combination of procurement time, cold ischemia time (from flush to out of ice), and warm ischemic time (from out-of-ice to reperfusion). DCD organs also have an initial donor warm ischemic period between withdrawal of donor care and initiation of cold flush. The effects of warm ischemic time and cold storage in DCD procurement are well studied [10,11,12▪,13]. Similarly, there is a growing body of evidence that ‘lukewarm’ ischemia time during donor extraction time has a negative impact on both liver and kidney allograft function following transplant, particularly in early allograft function [14,15▪].

Liver graft dysfunction

Livers from DCD donors already have significantly higher rates of primary graft nonfunction, hepatic artery stenosis and ischemic cholangiopathy relative to those from DBD donors [16–19]. DCD donor functional warm ischemic time was the second most significant predictor or graft failure due to ischemic cholangiopathy or primary nonfunction [20]. A 90–120 s delay in initiating cold perfusion during a joint DCD procurement increases the risk of ischemic cholangiopathy by 20–30% [21,22].

Renal graft dysfunction

Unlike kidneys from DBD donors, time to nephrectomy increases the risk of graft loss in kidneys from DCD donors. Every 10 min of additional nephrectomy time increases the risk of graft loss by the approximately same amount as an additional hour of cold ischemic time [15▪]. Delayed graft function has also been correlated to donor extraction time, with a nearly 20% increased risk of delayed graft function for every 5 min extraction time over 60 min [23]. The increased rate of DGF among DCD kidney recipients is associated with longer postoperative hospital stays [24].

Organ discard rate

Abdominal organ discard is another significant potential consequence of joint DCD procurements. For donors that are pronounced near the acceptable upper limit of functional warm ischemia time, a several minute delay in flush resulting from the collection of donor blood can lead to liver and heart discard [9▪▪]. Although data from the UK and Australia suggests that this may be a rare occurrence, the overall effect of widespread adaptation of joint DCD procurements on organ discard in the US remains to be seen.

TECHNICAL CONSIDERATIONS TO MINIMIZE DELAY IN INITIATION OF FLUSH

The primary focus in optimizing joint DCD procurements should be to minimize ischemic time for all organs. Potential approaches fall in three categories: initiation of abdominal flush independent of cardiac team blood collection, expediting blood collection, and improved team-based coordination. We outline several options below; some may be used in combination.

Initiation of abdominal flushing independent of cardiac team blood collection

Cross-clamp location: The optimal site of aortic cross clamp should be easily accessible and pose low risk for organ injury. It has been suggested the abdominal procurement team clamp the suprahepatic inferior vena cava (IVC) and the supraceliac aorta to allow for early aortic flushing without dilution of the blood collected for the cardiac pump [9▪▪]. Although this does isolate thoracic blood collection from abdominal flush, it requires some liver mobilization with risk of injury to the suprahepatic cava or an aberrant left hepatic artery and adds time prior to flush. Instead, we propose thoracic control of the aorta and vena cava. The cardiac team can complete the sternotomy, then clamp the descending thoracic aorta and occlude the suprahepatic vena cava above the diaphragm with a Bainbridge clamp or a vessel loop.

Use of a balloon catheter: Many European centers routinely use double balloon catheters for thoracic aortic occlusion during DCD procurements [25]. This technique can be modified to the joint DCD procurement. A double balloon triple lumen catheter can be introduced via the right common femoral artery with inflation of the upper balloon above the diaphragm and the lower balloon at the aortic bifurcation. The abdominal organs may then be flushed in isolation from the thoracic organs and lower extremities. If rapid cannulation from the iliac artery is not feasible, the cardiac team could pass a large Foley catheter down the aortic arch to the descending thoracic aorta to allow for aortic ‘crossclamp’ on inflation.

Either of the above maneuvers will require modifications to venting. Sufficient venting is key to creating a low resistance circuit that allows for a good flush. During joint DCD procurements, the traditional vent via the supra-diaphragmatic IVC at the cavo-atrial junction is not an option until the donor blood is obtained. One option is venting infra-renal IVC at the iliac bifurcation, either by placing a large Foley catheter in the iliac vein or by creating a venotomy.

Normothermic regional perfusion

Abdominal in situ normothermic regional perfusion (NRP) was developed in Spain in a porcine model as an adaptation of extra-corporeal membrane oxygenation (ECMO) to the DCD context [26–28] and is now commonly used in Europe. Use of NRP during DCD procurements decreases rates of early allograft dysfunction and ischemic cholangiopathy for livers [29] and delayed graft function for kidneys [30]. Intra-abdominal NRP protocols vary slightly. One common variation entails placement of a balloon catheter via the donor's femoral artery with inflation of the balloon in the descending thoracic aorta, as well as femoral artery and femoral vein cannulation in the contralateral groin. This vascular access can achieved percutaneously [31] or during a rapid laparotomy [32]. Heparin is administered, either directly to the donor or via the primed ECMO circuit. Blood passes from the patient into the femoral vein catheter, through a pump and ECMO circuit and heat exchanger, and is returned oxygenated via the arterial line. The procurement dissection then proceeds as it would for a brain-dead donor.

The abdominal NRP procedure may be adapted for joint pulmonary-abdominal procurements in one of two ways, procurement of the thoracic organs with abdominal NRP or thoraco-abdominal NRP (TA-NRP). The first involves initiation of abdominal NRP as previously described, followed by sternotomy, clamping the thoracic aorta above the aortic occlusion balloon, cannulation of the pulmonary artery for pneumoplegia, then clamping the superior vena cava (SVC) in the chest to allow continued abdominal NRP [33]. This approach can be adapted for cardiac procurement [34]. In TA-NRP the sternotomy is performed with arterial cannulation of the distal ascending aorta and venous cannulation of the right atrial appendage and attached to the extra corporeal membrane oxygenation (ECMO) circuit. After the aortic arch branches are clamped to prevent cerebral reperfusion, ECMO is initiated. A laparotomy is performed expeditiously with ligation of the limb vessels to occlude distal circulation [35].

Enhanced blood availability or collection

Preprocurement donor transfusion: Some studies using the TransMedics OCS required the donor to be transfused to a hemoglobin of 10 g/dl to facilitate blood collection during the procurement [36]. While this is feasible, it may complicate the critical care management of donors, who may already be volume overloaded following extensive resuscitation efforts.

Suction-assisted blood collection: In the UK, some groups place a large cannula into the right atrium with connection to a cell-saver device to drain blood via suction aspiration. This technique reduces blood collection to under a minute [37]. This technique should be strongly considered, as it accomplishes the necessary aims of both teams with minimal procurement delay. Availability at donor hospitals and cost of equipment may limit wider application.

Use of washed banked blood to prime cardiac perfusion pump: Priming the TransMedics OCS machine requires 4–5 units of packed red blood cells. This completely eliminates any delay for blood collection. However, banked blood is hypocalcemic due to chelation with the citrate used for anticoagulation and hyperkalemic; both can adversely affect cardiac function. Washing the blood eliminates these electrolyte concerns but increases cost.

Patient positioning: Placing the donor in steep Trendelenburg can facilitate blood collection. Unfortunately, this also significantly impairs ergonomics and visualization for the abdominal team during this critical time. The plan for changing patient position during the blood collection should be discussed in advance, as the abdominal surgeons will often require footstool(s) to allow them to continue operating.

Systems-based improvements

Team learning: An alternative way to minimize donor warm ischemic time would be to develop joint DCD heart and liver procurement teams. Numerous studies demonstrate that learning curve associated with any new procedure is best addressed by utilization of a consistent team [38,39]. Instead of the current reliance on random pairings of teams that meet for the first time a the donor hospital, cardiac teams that regularly procure DCD hearts could work with selected abdominal procurement surgeons, either from their center or from the OPO. These teams could then be deployed together for all joint heart liver transplants. With increasing frequency of joint DCD procurements, training sessions could be offered to all procurement teams at the OPO or national level.

Creation of national or OPO-based standard protocols: Ideally, standardized parameters for the procedure, order of operations, and timing of joint procurements should be addressed by UNOS to optimize all organ outcomes. Potential areas of focus include:

  • (1) Recommend the use of one or more methods to speed the collection of blood for the cardiac pump;
  • (2) Establish an upper limit for delay in aortic flush resulting from blood collection;
  • (3) Standardize a protocol for aortic and caval control for all joint DCD procurements;
  • (4) Consider the extent to which allowable delays should be modified in the case of marginal organ donors (e.g. increased age, higher BMI).
  • (5) Establish whether or not the abdominal team must delay the hepatectomy to allow lung recovery.

However, given the extant wide variation in DCD procurement practices [40], such consensus may be difficult to achieve. In the absence of an overriding policy, the logistics of a joint DCD procurement should be discussed between teams as early as possible, preferably at the time of organ offer.

AVENUES FOR FURTHER RESEARCH

Further data is needed to accurately assess the impact of joint DCD procurement on organ quality and usage. Time to initiation of flush in joint DCD procurements should be tracked and compared to that in abdominal DCD procurements at a national level. Likewise, the organ discard rate and reasons for nonuse in joint procurements should be reported.

Though the Donors After Circulatory Death Heart Trial is monitoring outcomes for DCD heart recipients, we believe that it is equally essential to follow the long-term outcomes of individuals who receive kidneys and livers procured during combined DCD liver and heart procurements. Long-term graft survival, patient survival, and complications rates should be compared to matched recipients who received livers form standard DCD procurements. The comparative outcomes should inform policy decisions regarding acceptable delays in initiation of cold perfusion.

In addition, the use of machine perfusion for livers merits further consideration, particularly in the context of joint DCD procurements. In the DHOPE-DCD study, hypothermic machine perfusion of DCD livers reduced the nonanastomotic biliary stricture rate from 18% to 6% [41]. This suggests that machine perfusion for DCD livers could mitigate risk of ischemic cholangiopathy secondary to prolonged donor warm ischemic time.

CONCLUSION

The increasing utilization of DCD heart and lung grafts is an excellent example of how our field continues to evolve, and the goal of helping more wait listed patients is omnipresent. Expansion of joint DCD procurements will increase organ availability, and national United Network for Organ Sharing (UNOS) guidelines should be established to optimize outcomes for all waitlisted patients. Early and frequent communication between the procurement teams is paramount to ensure a successful joint procurement.

Acknowledgements

None.

Financial support and sponsorship

None.

Conflicts of interest

There are no conflicts of interest.

REFERENCES AND RECOMMENDED READING

Papers of particular interest, published within the annual period of review, have been highlighted as:

▪ of special interest

▪▪ of outstanding interest

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These authors contributed equally to this work.

Keywords:

donation after circulatory death; heart donor; kidney donor; liver donor; organ procurement

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