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Updated: Jul 7, 2026
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Point of Care Transcranial Color-Coded Duplex Ultrasound of the Middle Cerebral Artery
Published on: August 9, 2024
Transcranial Doppler ultrasonography in intensive care
F A Rasulo1, E De Peri, A Lavinio
1Institute of Anesthesiology and Intensive Care, Spedali Civili University Hospital of Brescia, Piazzale Spedali Civili, Brescia, Italy. rasulo@med.unibs.it
European Journal of Anaesthesiology. Supplement
|April 17, 2008
Summary
Transcranial Doppler (TCD) is a versatile bedside tool for monitoring cerebral blood flow and assessing conditions like vasospasm and stenosis. It aids in evaluating cerebrovascular autoregulation and diagnosing brain death, offering crucial insights into brain health.
Area of Science:
- Neurology
- Medical Imaging
- Vascular Ultrasound
Background:
- Transcranial Doppler (TCD) has been a clinical standard since 1982 for non-invasive cerebral blood flow assessment.
- Ultrasound penetration of the skull is limited by bone, necessitating specific low frequencies (1-2 MHz) and acoustic windows.
- Accurate intracranial vessel identification relies on velocity, direction, depth, spatial relationships, and response to compression.
Purpose of the Study:
- To provide a comprehensive overview of Transcranial Doppler (TCD) technology and its clinical applications.
- To detail the principles of TCD, including acoustic windows and vessel identification techniques.
- To explore TCD's role in diagnosing and managing critical neurological conditions.
Main Methods:
- Utilizes low-frequency ultrasound (1-2 MHz) transmitted through specific acoustic windows (transtemporal, transorbital, suboccipital, retromandibular).
- Identifies intracranial vessels by analyzing flow velocity, direction, depth, spatial relationships, and response to carotid compression.
- Employs techniques like the Lindegaard Index and transient hyperaemic response test for advanced assessments.
Main Results:
- TCD is effective for assessing vasospasm, intracranial stenosis, cerebrovascular autoregulation, and estimating intracranial pressure.
- Mean flow velocity changes correlate with flow and vessel diameter, with vasospasm being a key pathological indicator.
- Specific criteria exist for diagnosing significant stenosis (>50%) and patterns indicative of brain death.
Conclusions:
- Transcranial Doppler is an indispensable tool for bedside monitoring of cerebral hemodynamics and treatment efficacy.
- It offers valuable non-invasive methods for evaluating critical conditions such as vasospasm, stenosis, and impaired autoregulation.
- TCD plays a vital role in the comprehensive assessment of brain death, complementing clinical criteria.
