Validation of UK Protocols to Exclude Brain Blood Flow During Normothermic Regional Perfusion (NRP)

Inclusion Criteria: * DCD donors in Cambridge University Hospital * Planned A-NRP * Consent for study has been obtained * Those who meet the appropriate criteria for DCD donation following WOLST * ≥ 18 years of age * ≤ 75 years of age Exclusion Criteria: * DBD organ donors * DCD organ donations outside of Cambridge University Hospital * DCD donors without planned A-NRP * DCD donors whose family have withheld consent for brain blood flow investigations. * Patients who do not meet the appropriate criteria for DCD donation following WOLST * Patients with injuries that will physically prevent use of the necessary assessment methods