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Related Experiment Videos

Transcranial Doppler in cerebral vasospasm.

D W Newell1, H R Winn

  • 1Department of Neurological Surgery, University of Washington School of Medicine, Seattle.

Neurosurgery Clinics of North America
|April 1, 1990
PubMed
Summary
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Transcranial Doppler (TCD) is a noninvasive tool for detecting cerebral vasospasm after subarachnoid hemorrhage. Elevated TCD velocities indicate vasospasm, helping predict ischemic deficits and guide treatment.

Area of Science:

  • Neurology
  • Medical Imaging
  • Vascular Surgery

Background:

  • Subarachnoid hemorrhage (SAH) frequently leads to cerebral vasospasm, a narrowing of cerebral arteries.
  • Cerebral vasospasm can cause delayed ischemic deficits and infarction.
  • Early detection and monitoring of vasospasm are crucial for patient management.

Purpose of the Study:

  • To evaluate the utility of Transcranial Doppler (TCD) in detecting and assessing cerebral vasospasm following SAH.
  • To correlate TCD velocity measurements with angiographic findings of vasospasm.
  • To explore the predictive value of TCD in identifying patients at risk for ischemic complications.

Main Methods:

  • Noninvasive assessment of basal cerebral artery blood flow velocity using TCD.

Related Experiment Videos

  • Correlation of TCD velocity measurements with angiographic severity of vasospasm.
  • Monitoring the time course of vasospasm development and resolution.

    • Main Results:

    • TCD accurately detects vasospasm by measuring inverse changes in blood flow velocity and vessel diameter.
    • Normal MCA velocity is 62 cm/sec; velocities of 120 cm/sec and ≥200 cm/sec correlate with significant and severe vasospasm, respectively.
    • High TCD velocities are associated with delayed ischemic deficits, similar to angiographic findings.

    Conclusions:

    • TCD is a valuable noninvasive tool for diagnosing and monitoring cerebral vasospasm post-SAH.
    • TCD velocity measurements aid in predicting the risk of ischemic complications.
    • Understanding the temporal profile of vasospasm via TCD assists in guiding therapeutic interventions.