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Related Experiment Video

Updated: Jun 29, 2026

Functional Transcranial Doppler Ultrasound for Monitoring Cerebral Blood Flow
09:41

Functional Transcranial Doppler Ultrasound for Monitoring Cerebral Blood Flow

Published on: March 15, 2021

[Transcranial doppler in neurosurgery].

T Geeraerts1, C Ract, J Duranteau

  • 1Département d'anesthésie-réanimation, hôpital de Bicêtre, AP-HP, Le Kremlin-Bicêtre, France. thgeeraerts@hotmail.com

Neuro-Chirurgie
|October 14, 2008
PubMed
Summary

Transcranial Doppler (TCD) measures cerebral blood flow using red blood cell velocities. Abnormal pulsatility index and end diastolic velocity values can indicate high ischemic risk and guide further diagnostic angiography.

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Area of Science:

  • Neurology
  • Vascular Medicine
  • Medical Imaging

Background:

  • Transcranial Doppler (TCD) is a noninvasive method to assess blood flow in basal cerebral arteries.
  • Mean velocities of red blood cells correlate with cerebral blood flow.
  • Diastolic velocity remains positive in cerebral circulation due to low peripheral resistance.

Purpose of the Study:

  • To evaluate the utility of TCD parameters in assessing cerebral circulation.
  • To understand the significance of pulsatility index (PI) and end diastolic velocity (EDV) in determining arterial resistance.
  • To explore TCD's role in detecting cerebral vasospasm post-subarachnoid hemorrhage.

Main Methods:

  • Utilizing Transcranial Doppler (TCD) to measure mean velocities of red blood cells in basal cerebral arteries.

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Last Updated: Jun 29, 2026

Functional Transcranial Doppler Ultrasound for Monitoring Cerebral Blood Flow
09:41

Functional Transcranial Doppler Ultrasound for Monitoring Cerebral Blood Flow

Published on: March 15, 2021

Point of Care Transcranial Color-Coded Duplex Ultrasound of the Middle Cerebral Artery
04:01

Point of Care Transcranial Color-Coded Duplex Ultrasound of the Middle Cerebral Artery

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  • Analyzing pulsatility index (PI) and end diastolic velocity (EDV) for resistance status evaluation.
  • Comparing TCD findings with angiography for vasospasm diagnosis.

    • Main Results:

    • High PI (>1.4) with low EDV (<20 cm/s) suggests low cerebral blood flow and high ischemic risk.
    • TCD can detect cerebral vasospasm but has lower sensitivity and specificity than angiography.
    • Day-to-day increases in velocities may indicate vasospasm risk, prompting angiography.

    Conclusions:

    • TCD provides valuable information on cerebral blood flow and arterial resistance.
    • Abnormal TCD parameters like high PI and low EDV are associated with increased ischemic risk.
    • While TCD aids in vasospasm risk assessment, angiography remains the gold standard for diagnosis.