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Related Experiment Videos

Developmental and physiologic changes in cerebral blood flow velocity

I Horiuchi1, S Sanada, S Ohtahara

  • 1Department of Child Neurology, Okayama University Medical School, Japan.

Pediatric Research
|September 1, 1993
PubMed
Summary

Mean blood flow velocity in the basilar artery changes with age in children, decreasing after age five. Transcranial Doppler sonography is a valuable tool for pediatric neurology research.

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Area of Science:

  • Neuroscience
  • Pediatric Neurology
  • Medical Imaging

Background:

  • Cerebral blood flow regulation is crucial for brain development and function.
  • Understanding age-related changes in cerebral hemodynamics is essential for diagnosing neurological conditions in children.
  • Transcranial Doppler sonography (TCD) offers a noninvasive method to assess cerebral blood flow velocity (MBFV) and cerebrovascular resistance.

Purpose of the Study:

  • To investigate the developmental changes in basilar artery (BA) mean blood flow velocity (MBFV) and resistance index (RI) in healthy Japanese children.
  • To examine the impact of sleep (NREM and REM) and hyperventilation on BA and middle cerebral artery (MCA) MBFV.
  • To compare the cerebrovascular response to hypercapnia in children versus adults.

Main Methods:

Related Experiment Videos

  • Utilized transcranial Doppler sonography (TCD) to measure MBFV and RI in the BA and MCA of healthy Japanese subjects across various age groups.
  • Recorded TCD parameters during wakefulness, non-rapid eye movement (NREM) sleep, rapid eye movement (REM) sleep, and hyperventilation.
  • Assessed the cerebrovascular response to controlled hypercapnia (expiratory CO2 level of 25 mm Hg) in pediatric and adult cohorts.

Main Results:

  • BA MBFV increased with age, peaking around 5 years, then gradually decreased. The MCA/BA MBFV ratio remained stable across age groups.
  • BA RI was highest in infants, decreased in toddlers, and stabilized thereafter.
  • MBFV was lower during NREM sleep compared to wakefulness; REM sleep showed similar values to wakefulness. Hyperventilation significantly reduced MBFV in both BA and MCA.
  • Children exhibited a more pronounced decrease in MBFV during hyperventilation compared to adults (p < 0.05).

Conclusions:

  • Cerebral blood flow dynamics undergo significant developmental changes in childhood, with distinct patterns in MBFV and RI.
  • Sleep state influences cerebral hemodynamics, with reduced flow during NREM sleep.
  • Children demonstrate a heightened cerebrovascular reactivity to hypercapnia, suggesting developmental differences in CO2 responsiveness.
  • TCD is a valuable, noninvasive tool for assessing cerebral hemodynamics in pediatric populations, with potential applications in clinical neurology.