12.6 DNC Timing, Ancillary Testing, Palliation & Donation

12.6 DNC Timing, Ancillary Testing, Palliation & Donation

Ancillary Testing

Ancillary testing is not routine and is not a substitute for performing every assessable examination and apnea-test element. Use it when a required element cannot be safely completed or adequately interpreted. Do not use it to bypass hypothermia, high sedative levels, or an otherwise testable element.

Acceptable US ancillary tests are conventional four-vessel catheter angiography and radionuclide cerebral perfusion studies, including SPECT or planar radionuclide angiography with an appropriate agent. Transcranial Doppler is acceptable in adults only and must not be used for children. EEG, evoked potentials, CT angiography, MRI, and MR angiography are not acceptable ancillary tests under the 2023 guideline. EEG measures cortical activity and cannot establish absence of brainstem function.

Compassionate Withdrawal of Ventilation

Withdrawal of life-sustaining treatment is ethically and clinically distinct from BD/DNC determination. Confirm goals with the family and interdisciplinary team, explain expected breathing and secretion changes, provide privacy, and agree on whether the tube will be removed or ventilator support gradually reduced.

Treat pain, dyspnea, and anxiety proactively with proportionate opioid and anxiolytic therapy under the palliative-care order set; titrate to observed comfort rather than an inflexible dose. Anticholinergic medication may reduce noisy secretions. Silence nonbeneficial alarms, remove burdensome monitoring, and offer oxygen only when it contributes to comfort. Neuromuscular blockers do not relieve pain or air hunger and must not be used to mask distress during withdrawal.

Donor Respiratory Management

After death is declared and donation authorization and organizational coordination are complete, protect potentially transplantable lungs. Use lung-protective tidal volume based on predicted body weight, sufficient PEEP to prevent collapse, the lowest FiO2 meeting the donation protocol, secretion clearance, recruitment only when indicated and tolerated, bronchoscopy and cultures when requested, fluid and hemodynamic management, and serial gas-exchange assessment. Targets vary by organ-procurement organization and donor physiology; one oxygen challenge result does not by itself determine suitability.

Exam Traps

• The interval between the two pediatric examinations is at least 12 hours for all pediatric ages; the prior age-based 24-hour interval is obsolete.
• Core temperature must be at least 36 C, not 35 C.
• A qualifying apnea test requires no breaths, pH below 7.30, PaCO2 at least 60, and a rise of at least 20 above baseline.
• EEG is no longer an acceptable ancillary test.
• A 48-hour observation after acute injury for children younger than 24 months occurs before evaluation; it is distinct from the 12-hour interval between examinations.

Ancillary-Test Decision Example

A child with devastating brain injury has absent assessable brainstem reflexes, but severe orbital trauma prevents valid pupillary, corneal, and ocular-movement testing. Complete and document every element that can be assessed. If all assessable findings are consistent and prerequisites are satisfied, use an acceptable cerebral-perfusion ancillary test under policy. Do not substitute EEG, CTA, MRI, MRA, or pediatric transcranial Doppler. If any clinical finding shows brain-mediated activity, stop: ancillary testing cannot convert that examination into BD/DNC.

Palliative Respiratory Checklist

Before withdrawal, clarify the order, intended sequence, symptom medications, secretion plan, oxygen use, family wishes, spiritual support, monitoring to discontinue, and who will remain at bedside. Suction only when it improves comfort. Watch facial expression, accessory-muscle use, tachypnea, agitation, and other distress signs, and request medication titration promptly. Document observed comfort and communication.

Donation Coordination

Donation discussions and organ-preservation orders follow the authorized procurement pathway and applicable law. Continue respectful family communication and do not let donor targets displace basic safety. After any recruitment, bronchoscopy, transport, or circuit disconnect, reassess airway position, pressure, gas exchange, and hemodynamics. Use the procurement organization's requested blood-gas and imaging sequence; suitability is a multidisciplinary judgment, not a single PaO2 threshold.

Time-of-Death Documentation

When the clinical evaluation is completed, institutional policy specifies which qualifying result establishes the recorded time of death. When a required ancillary perfusion test is used, the 2023 guideline assigns the time when the attending interpreting clinician documents that its result is consistent with BD/DNC. Keep this legal documentation separate from later family accommodation, discontinuation of organ support, or donation procedures. Continuing cardiopulmonary support for a limited period does not reverse or postpone an already valid determination.

Policy cross-check

Before any BD/DNC evaluation, use the current institutional checklist to confirm examiner qualifications, applicable state law, consent or notification requirements, prerequisites, approved ancillary modalities, and documentation fields. The national guideline establishes medical standards, while local law and policy govern implementation details. When a required element cannot be completed, pause and consult neurology or critical-care leadership rather than substituting an unapproved test or an older age-based timetable.