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Related Experiment Videos

B-waves in healthy persons.

D Mautner-Huppert1, R L Haberl, U Dirnagl

  • 1Department of Neurology, Klinikum Grosshadern, Munich, FRG.

Neurological Research
|December 1, 1989
PubMed
Summary
This summary is machine-generated.

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Physiological intracranial pressure oscillations, known as B-waves, were observed in patients and healthy subjects. These findings suggest B-waves may be a normal physiological phenomenon related to cerebral blood flow regulation.

Area of Science:

  • Neuroscience
  • Cerebrovascular Physiology

Background:

  • Intracranial pressure (ICP) monitoring is crucial in neurocritical care.
  • The physiological basis of slow ICP oscillations (0.5-2/min), termed B-waves, remains debated.

Purpose of the Study:

  • To investigate whether B-waves represent a physiological phenomenon.
  • To correlate ICP B-waves with cerebral blood flow velocity oscillations.

Main Methods:

  • ICP was monitored in 5 patients.
  • Middle cerebral artery (MCA) flow velocity was assessed using transcranial Doppler sonography (TCD) in patients and 10 healthy subjects.
  • Simultaneous oscillations in ICP and MCA flow velocity were analyzed.

Main Results:

  • ICP oscillations at 0.5-2/min (B-waves) were observed in patients.

Related Experiment Videos

  • Similar oscillations in MCA flow velocity were detected in 80% of healthy subjects (10% amplitude).
  • Data suggest a correlation between ventricular pressure and MCA flow velocity oscillations.

    • Conclusions:

    • The presence of similar oscillations in healthy individuals supports the physiological nature of B-waves.
    • Rhythmic cerebral vascular diameter changes may cause concurrent oscillations in cerebral blood volume and pressure.
    • B-waves are likely a physiological manifestation of cerebral circulatory dynamics.