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Transcranial Doppler assessment of brain death in children
Insights
Transcranial Doppler (TCD) effectively identifies brain death in children. Specific waveform patterns, like retrograde diastolic flow in the middle cerebral arteries, reliably indicate brain death with high accuracy.
Area of Science:
- Pediatric Neurology
- Neurocritical Care
- Diagnostic Imaging
Background:
- Determining brain death in children is critical but can be challenging.
- Transcranial Doppler (TCD) offers a non-invasive method to assess cerebral blood flow.
Purpose of the Study:
- To evaluate the diagnostic value of TCD in confirming brain death in pediatric patients.
- To identify specific TCD waveform characteristics indicative of brain death.
Main Methods:
- Fifty-eight comatose children underwent TCD examinations, monitoring middle cerebral artery (MCA) waveforms and flow velocities.
- Electroencephalogram (EEG) was used concurrently in a subset of patients.
- Statistical analysis, including chi-square testing, was employed to assess the prevalence of specific flow patterns.
Main Results:
- All patients diagnosed with brain death exhibited "special" TCD waveforms, including retrograde diastolic flow (RDF) or small systolic forward flow (SFF).
- RDF was significantly more prevalent in the brain death group compared to non-brain death and survival groups (p < 0.01).
- Persistent RDF or SFF, with a flow index < 0.8 in MCAs for over 2 hours, proved to be a reliable indicator, yielding no false positives or negatives.
Conclusions:
- Transcranial Doppler (TCD) demonstrates high sensitivity and specificity for diagnosing brain death in children.
- Specific TCD findings, particularly concerning MCA flow patterns, are valuable adjuncts in the clinical determination of brain death.
Aim:
To estimate the values of transcranial doppler (TCD) in the determination of brain death in children.
Method:
Fifty-eight comatose children (from 2 days to 13 years, median 28 months) with Glasgow Coma Sores of < or = 7 had TCD examinations. The waveforms and the cerebral blood flow velocities of the middle cerebral arteries (MCAs) were monitored at intervals. Electroencephalogram (EEG) was recorded continuously in 34 patients. Twenty children survived, 38 died, 17 patients met the criteria for determination of brain death by clinical and EEG criteria or by clinical criteria alone. The prevalence of retrograde diastolic flow (RDF) was analysed by using chi-square test.
Results:
All the brain death patients displayed "special" TCD waveforms including RDF or small systolic forward flow (SFF). RDF appeared in 14, 2 and 3 patients in the brain death, non-brain death and survival group respectively. The occurrence of RDF in the brain death group was significantly higher than in the other two groups (p < 0.01). Persistence of RDF or SSF and direction of flow index < 0.8 in the MCAs for more than 2 hours in serious comatose children, was a reliable indicator to predict or confirm brain death. Using this criteria, no false negative or false positive results were found in this group of patients.
Conclusion:
TCD has a high sensitivity and specificity in the determination of brain death in children.