Practice of transcranial Doppler-assisted brain death determination

Key findings from this study

This research indicates that:

• Transcranial Doppler combined with electroencephalography or short-latency somatosensory evoked potential achieved receiver operating characteristic curve areas of 0.990–1.000 across all patient stratifications, outperforming transcranial Doppler alone.
• Combined modality testing maintained zero false-positive rate regardless of whether initial clinical assessment contained diagnostic flaws.
• Diagnostic accuracy of combined testing remained maximal across brain injury sites including those with flawed initial clinical assessment.

Overview

This study examined the diagnostic accuracy of transcranial Doppler ultrasonography combined with electroencephalography or somatosensory evoked potential testing for brain death determination in cases where clinical assessment contains procedural flaws.

Methods and approach

Researchers conducted three comparison analyses across patient cohorts stratified by clinical brain death status, presence or absence of diagnostic flaws in initial clinical assessment, and anatomical location of brain injury. Three confirmation test techniques aligned with Chinese brain death determination criteria were evaluated.

Results

Transcranial Doppler combined with electroencephalography or short-latency somatosensory evoked potential demonstrated superior diagnostic performance compared to transcranial Doppler alone across all analytic comparisons. In the initial comparison distinguishing brain death from non-brain death cases, combined testing achieved receiver operating characteristic curve areas of 0.997 and 0.995 respectively, with zero false-positive rate.

When cases with flawed clinical assessment were isolated, combined modality testing yielded receiver operating characteristic curve areas of 0.990–1.000 in both flawed and non-flawed assessment groups, maintaining zero false-positive rate and outperforming independent transcranial Doppler assessment. Analysis stratified by brain injury site revealed that combined testing consistently achieved near-perfect or perfect diagnostic accuracy across different lesion locations.

Implications

Combined transcranial Doppler with electroencephalography or somatosensory evoked potential testing offers substantial diagnostic improvement when initial clinical brain death determination contains technical or procedural deficiencies. This multimodal approach may reduce diagnostic uncertainty and support confirmatory decision-making in challenging cases where standard clinical protocols yield equivocal or incomplete findings.

The consistent zero false-positive rate across diverse clinical scenarios suggests that combined testing substantially mitigates diagnostic error risk. Implementation of this combined approach in protocols for flawed initial assessments may enhance reliability of brain death determination across varied injury patterns and institutional contexts.

Scope and limitations

This summary is based on the study abstract and available metadata. It does not include a full analysis of the complete paper, supplementary materials, or underlying datasets unless explicitly stated. Findings should be interpreted in the context of the original publication.