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Cyclical fluctuations in cerebral blood volume
L N Livera1, Y A Wickramasinghe, S A Spencer
1Neonatal Intensive Care Unit, North Staffordshire Maternity Hospital, Stoke on Trent.
Archives of Disease in Childhood
|January 1, 1992
Summary
Researchers observed rhythmic fluctuations in cerebral blood volume using near-infrared spectroscopy. This phenomenon occurs at a frequency of 3.5 cycles per minute, consistent with previous Doppler ultrasound findings.
Area of Science:
- Neuroscience
- Biomedical Engineering
- Physiology
Background:
- Cerebral blood flow velocity fluctuations were previously documented using Doppler ultrasound.
- Near-infrared spectroscopy (NIRS) allows for non-invasive monitoring of cerebral blood volume.
- Understanding cerebral hemodynamics is crucial for diagnosing and managing neurological conditions.
Purpose of the Study:
- To investigate rhythmic fluctuations in cerebral blood volume.
- To determine the frequency of these fluctuations using NIRS.
- To correlate NIRS findings with previous Doppler ultrasound observations.
Main Methods:
- Utilized near-infrared spectroscopy (NIRS) to measure changes in cerebral blood volume.
- Analyzed NIRS data to identify cyclical patterns and their frequencies.
- Compared findings with existing literature on cerebral blood flow velocity.
Main Results:
- Rhythmic fluctuations in cerebral blood volume were detected.
- The observed fluctuations occurred at a consistent frequency of 3.5 cycles per minute.
- These findings corroborate previous reports of cyclical phenomena in cerebral hemodynamics.
Conclusions:
- Near-infrared spectroscopy can detect rhythmic fluctuations in cerebral blood volume.
- The frequency of 3.5 cycles/minute represents a significant physiological rhythm.
- This study validates NIRS as a tool for assessing dynamic cerebral blood volume changes.