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Transcranial Doppler in cerebrovascular disease
Stroke
|September 1, 1986
Summary
Transcranial Doppler ultrasonography noninvasively assesses intracranial artery blood flow. It accurately detects middle cerebral artery stenosis and vasospasm, aiding in cerebrovascular disease diagnosis and management.
Area of Science:
- Neurology
- Medical Imaging
- Vascular Ultrasound
Background:
- Transcranial Doppler (TCD) ultrasonography enables noninvasive assessment of intracranial arterial blood flow.
- A 2 MHz probe allows bone penetration for signal acquisition in intracranial arteries.
Observation:
- Thirty-two healthy subjects and 11 patients with cerebrovascular diseases were studied.
- Patients had conditions including vasospasm post-subarachnoid hemorrhage, middle cerebral artery stenosis, and extracranial internal carotid artery stenosis.
Findings:
- Increased peak velocity and spectral broadening in TCD signals correlated with middle cerebral artery vasospasm or stenosis.
- Reduced peak velocity and blunted waveforms indicated severe extracranial internal carotid stenosis with compromised collateral flow.
Implications:
- Transcranial Doppler effectively identifies middle cerebral artery vasospasm and stenosis.
- TCD may noninvasively evaluate collateral circulation through the Circle of Willis in carotid stenosis patients.