Determination of Brain Death and Organ Donation

Brain death, defined as the irreversible cessation of all brain function, is both a clinical and legal determination that allows for the ethical procurement of organs for transplantation. Its diagnosis rests on a combination of neurological examination, including assessment of coma, brainstem reflexes and an apnea test, supported—when required—by ancillary investigations that demonstrate absence of cerebral blood flow or metabolism. The global agreement on criteria varies by jurisdiction, but key principles include clear aetiology of injury, exclusion of reversible causes, standardised examination and observation intervals. Ensuring accuracy in diagnosis is vital to maintain public trust, respect patients’ rights and optimise organ donation rates. Advances in imaging and bedside monitoring have refined the sensitivity and specificity of confirmatory tests, while ethical frameworks underpin consent processes for donors and guide allocation. Integrated multidisciplinary teams coordinate critical care management of potential donors—addressing haemodynamic stability, hormonal support and infection control—to preserve organ viability. As transplantation demand grows, harmonised protocols and innovations in diagnostic testing play a central role in balancing respect for the dying patient with the urgent needs of recipients worldwide.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Determination of Brain Death and Organ Donation publication trend

The graph below shows the total number of articles in determination of brain death and organ donation across all publications each year (not limited to Nature Index journals).

Technical terms

Brain death: Irreversible loss of all functions of the brain and brainstem, legally recognised as death.

Apnea test: Clinical procedure to assess spontaneous respiratory drive under controlled hypercarbia, confirming absence of brainstem respiratory function.

Ancillary test: Any supplementary investigation—such as imaging or electrophysiology—used when clinical examination is inconclusive or cannot be fully performed.

Computed tomography angiography (CTA): Non-invasive imaging technique using contrast-enhanced CT to visualise cerebral vessels and detect absence of intracranial circulation.

Computed tomography perfusion (CTP): Functional imaging method measuring cerebral blood flow and volume to confirm global cessation of perfusion in brain death assessment.

Transcranial Doppler: Ultrasound method for assessing cerebral blood flow velocities in basal arteries, used to detect circulatory arrest in brain death evaluation.

References

1. Brain death: a clinical overview. Journal of Intensive Care (2022).
2. Diagnostic Accuracy of Transcranial Doppler for Brain Death Confirmation: Systematic Review and Meta-Analysis. American Journal of Neuroradiology (2015).
3. Computed Tomography Perfusion is a Useful Adjunct to Computed Tomography Angiography in the Diagnosis of Brain Death. Clinical Neuroradiology (2017).