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[The potential usefulness of transcranial Doppler sonography in cerebrovascular surgery]
K Moritake1, Y Yonekawa, S Nagasawa
1Department of Neurosurgery, Kyoto University Hospital, Japan.
Insights
Transcranial Doppler sonography offers direct insights into intracranial hemodynamics, improving diagnosis of cerebrovascular lesions and surgical outcomes. This method aids in early vasospasm detection and arteriovenous malformation classification.
Area of Science:
- Neurology
- Vascular Surgery
- Medical Imaging
Context:
- Neurosurgical interventions require precise hemodynamic assessment of the circle of Willis.
- Distinguishing intracranial from extracranial hemodynamics is crucial for accurate diagnosis.
- Existing methods may lead to confusion with collateral effects.
Purpose:
- To evaluate the utility of transcranial Doppler sonography (TCD) in assessing intracranial hemodynamics during neurosurgery.
- To compare TCD with extracranial Doppler sonography for detecting intracranial occlusive lesions.
- To explore TCD's role in diagnosing vasospasm and classifying arteriovenous malformations.
Summary:
- Transcranial Doppler sonography provided direct and significant information on intracranial hemodynamics in 30 neurosurgical patients.
- TCD enabled more accurate detection of intracranial occlusive lesions and assessment of vascular reconstructive surgery effectiveness.
- Specific sound-spectrogram findings in basal cerebral arteries were associated with stenosis in aneurysmal subarachnoid hemorrhage patients.
Impact:
- TCD facilitates early diagnosis and treatment protocols for cerebral vasospasm.
- It serves as a valuable tool for hemodynamic classification of arteriovenous malformations (high-flow/low-flow, steal phenomenon).
- TCD shows promise for further development and utilization in cerebrovascular surgery.
Abstract:
In 30 patients undergoing neurosurgical intervention, the authors evaluated the hemodynamics in the circle of Willis by transcranial Doppler sonography. By avoiding confusion with collateral effects, the transcranial Doppler sonography yielded direct and more significant information concerning the intracranial hemodynamics than extracranial Doppler sonography. Therefore, it made possible to detect intracranial occlusive lesions with less false findings. It gave us more accurate information on the effectiveness of reconstructive vascular surgery. In two of five consecutive patients with a proven aneurysmal subarachnoid hemorrhage, sound-spectrogram specific to stenosis was detected from the basal cerebral arteries which accompanied increase of the time-mean velocity of the upper spectrum and decrease of S/D ratio. Transcranial Doppler sonography was considered to contribute to the establishment of a protocol for early diagnosis and treatment of vasospasm. Transcranial Doppler sonography was also utilized as a useful tool for classification of arteriovenous malformation from the viewpoint of hemodynamics, namely high-flow or low-flow and with or without steal phenomenon. Transcranial Doppler sonography appears sufficiently promising to justify further development and utilization in cerebrovascular surgery.