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Oscillatory cerebral hemodynamics--the macro- vs. microvascular level.

Matthias Reinhard1, Elisabeth Wehrle-Wieland, Daniel Grabiak

  • 1Department of Neurology and Clinical Neurophysiology, University of Freiburg, Neurocenter, Breisacherstr. 64, D-79106 Freiburg, Germany. reinhard@nz.ukl.uni-freiburg.de

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Cerebral autoregulation involves phase shifts between blood pressure and brain blood flow. This study shows impaired cerebral autoregulation in carotid disease alters these phase shifts at the cortical microvascular level.

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Area of Science:

  • Neuroscience
  • Physiology
  • Biomedical Engineering

Background:

  • Cerebral autoregulation maintains stable brain blood flow despite blood pressure fluctuations.
  • Phase shifts between blood pressure (BP) and middle cerebral artery flow velocity (MCAFV) indicate autoregulatory action.
  • Cortical microvascular responses to BP oscillations are not well understood, especially in pathological conditions.

Purpose of the Study:

  • To investigate phase relationships between BP, MCAFV, and near-infrared spectroscopy (NIRS) parameters in healthy adults and patients with carotid disease.
  • To determine if cortical microvascular hemodynamics exhibit phase shifts similar to macrovascular measures.
  • To assess the impact of carotid obstruction on these phase relationships and cerebral autoregulation.

Main Methods:

  • Noninvasive BP monitoring using finger plethysmography.
  • Induction of stable 0.1 Hz hemodynamic oscillations via regular breathing (6/min).
  • Simultaneous recording of BP, MCAFV, and NIRS-assessed cortical hemodynamics (oxy- and deoxyhemoglobin).

Main Results:

  • BP-induced cortical microvascular oscillations (NIRS) lagged MCAFV oscillations by 80-90 degrees (2-2.5s), suggesting transit time.
  • Oxy- and deoxyhemoglobin oscillated counterphase (180 degrees).
  • Carotid obstruction caused delayed NIRS oscillations, reduced MCAFV-BP phase lead, and decoupled oxy-/deoxyhemoglobin oscillations (240 degrees), indicating disturbed autoregulation.

Conclusions:

  • Cortical hemodynamic responses to BP oscillations follow specific phase relationships influenced by autoregulation and transit times.
  • Hemodynamic impairment in carotid obstruction significantly alters these phase relationships.
  • Altered phase shifts reflect disturbed cerebral autoregulation in patients with severe carotid disease.