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[Noninvasive screening of cerebral death by Doppler sonography (author's transl)]
Insights
Directional Doppler sonography revealed characteristic changes in internal carotid and vertebral arteries in patients with no cerebral flow. These distinct Doppler findings aid in identifying the need for early cerebral angiography.
Area of Science:
- Neurology
- Vascular Imaging
- Diagnostic Ultrasound
Context:
- Assessing cerebral blood flow in patients with suspected cessation of brain activity.
- Evaluating the utility of non-invasive Doppler sonography for detecting absent cerebral circulation.
- Distinguishing true cerebral circulatory arrest from other neurological conditions.
Purpose:
- To investigate the effectiveness of Directional Doppler sonography in identifying absent cerebral blood flow.
- To characterize the Doppler waveform patterns in the supratrochlear, internal carotid, and vertebral arteries in patients with no cerebral flow.
- To differentiate these findings from conditions like arteriosclerotic occlusion or cerebral edema.
Summary:
- Directional Doppler sonography was performed on 16 patients with angiographically confirmed absence of cerebral flow.
- While supratrochlear artery findings were inconsistent, the internal carotid and vertebral arteries showed diminished systolic velocity and diastolic flow reversal.
- These specific Doppler signatures were not observed in arteriosclerotic occlusion or cerebral edema, indicating their unique diagnostic value.
Impact:
- Directional Doppler sonography provides a valuable non-invasive tool for assessing cerebral circulatory arrest.
- The characteristic findings can help clinicians determine the necessity for early cerebral angiography.
- This technique may improve the diagnostic pathway for patients with severe neurological compromise.
Abstract:
Directional Doppler sonography of the supratrochlear and extracranial cerebral arteries was performed on 16 patients without any cerebral flow, as confirmed angiographically. The findings were inconsistent for the supratrochlear artery, but the internal carotid and vertebral arteries had characteristic changes in the Doppler curve with clearly diminished systolic flow velocity and flow reversal during diastole. These results were never seen in arteriosclerotic occlusion, hypoxaemic or toxic cerebral oedema. Doppler sonography thus helps to formulate indications for early cerebral angiography.