Overview
Normothermic regional perfusion (NRP) utilizes Extracorporeal Membrane Oxygenation (ECMO) or cardiopulmonary bypass to reperfuse the heart and other organs in situ after isolation and ligation of the cerebral vessels. In situ resuscitation of the heart has the added advantage of allowing full hemodynamic and echocardiographic assessment of the donor heart prior to final acceptance for transplantation without the imminent danger of ongoing warm ischemia.
Description
The current procedure of DCD organ donation and procurement follows a well-established course for lung, liver, kidney and pancreas transplantation in the United States. After consent has been obtained, the organs are allocated through UNOS. When all parties are present and ready, the donor is withdrawn from life support (i.e., discontinuation of mechanical ventilation and any vasoactive medications). The surgical teams are generally present on the premises but not at the donor's bedside. After circulatory arrest occurs, which is determined by the absence of pulse and organized rhythmic cardiac activity, death is declared by a physician not associated with the transplant teams. Subsequently a period of stand-off is observed (5 minutes for organs donated in New York) to ensure complete cessation of the circulation before organ procurement is commenced. If after withdrawal of life support the patient does not progress to circulatory death within the allotted time (variable among hospitals, but 180 minutes in this study), the procurement is abandoned and the patient is transferred out of the operating room and placed on palliative measures.
Given that DCD organ donation is already currently practiced in the US, the same standard approach defined by each state and locality can also be applied to DCD heart donation and will be followed for this protocol at NYULH. However, this protocol will utilize a normothermic regional perfusion (NRP) strategy that involves reestablishment of circulatory blood flow after the period of circulatory arrest has been established and the 5 minutes of standoff time has passed. The local Organ Procurement Organization (LiveOnNY) and NYULH Medical Leadership have reviewed and approved this approach to DCD heart donation. Specifically, normothermic regional perfusion involves the following steps:
- Opening the chest through a standard sternotomy used for heart and lung procurement.
- Ligation of the all the blood vessels that supply blood to the brain to ensure that blood flow to the brain is not reestablished once circulation is restarted as described below.
- Standard cannulation of the aorta and the right atrium as is done for cardiac surgical procedures.
- Initiation of cardiopulmonary bypass, which will re-establish the flow of blood to all organs of the body including the heart under normothermia. The initial step for ligation of the blood vessels to the head is necessary to ensure that blood flow to the brain does not occur.
Once blood flow to the heart is established, the heart will start beating. At 30 minute intervals, the donor will be separated from cardiopulmonary bypass and the heart will be assessed for functionality. If accepted standard DBD procurement will commence. The heart transplantation surgery on the potential recipient will only begin once the heart has been accepted as suitable.
If after assessment the heart is not suitable, cardiopulmonary bypass will be restarted. The donor heart will be reassessed at 30 minute intervals up to 180 minutes. If no significant acceptable recovery occurs and the heart is not deemed suitable for transplantation, then the study will be terminated, but the remaining organs can be recovered as standard practice.
Eligibility
Inclusion Criteria:
- Recipient is 18 years old
- Recipient, or their designated healthcare proxy, is able and willing to sign informed consent
- Recipient meets standard listing criteria for heart transplantation at NYU Langone Health Transplant Institute
Exclusion Criteria:
- Recipient is < 18 years old
- Recipient, or their designated healthcare proxy, is unable to sign informed consent
- Recipient is participating in another interventional trial
- Recipient has a known history of HIV infection
- Recipient has any condition that, in the opinion of the Investigator, would make study participation unsafe or would interfere with the objectives of the study