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Autoregulation of Blood Flow01:17

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Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
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Early Pathological and Magnetic Resonance Detection of Cerebral Injury Using a Rat Model of Neonatal Hypoxic Ischemic Encephalopathy
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Optimizing Cerebral Autoregulation May Decrease Neonatal Regional Hypoxic-Ischemic Brain Injury.

Jennifer K Lee1, Andrea Poretti, Jamie Perin

  • 1Department of Anesthesiology and Critical Care Medicine, Johns Hopkins School of Medicine, Baltimore, MD, USA.

Developmental Neuroscience
|December 16, 2016
PubMed
Summary
This summary is machine-generated.

Optimizing blood pressure within a specific range during therapeutic hypothermia may reduce brain injury in newborns with hypoxic-ischemic encephalopathy (HIE). This approach shows promise as an additional treatment for HIE.

Keywords:
Brain injuryCerebral blood flowHypoxiaHypoxic-ischemic encephalopathyNeonates

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Area of Science:

  • Neonatal neurology
  • Neurocritical care
  • Pediatric intensive care

Background:

  • Therapeutic hypothermia offers limited neuroprotection for neonatal hypoxic-ischemic encephalopathy (HIE).
  • Understanding factors influencing brain injury beyond hypothermia is crucial.

Purpose of the Study:

  • To investigate the association between hemodynamic management supporting cerebral autoregulation and brain injury in neonates with HIE.
  • To determine if birth asphyxia severity or anatomical region modifies this association.

Main Methods:

  • Utilized near-infrared spectroscopy (NIRS) to monitor autoregulation in cooled neonates with HIE.
  • Identified mean arterial blood pressure for optimal autoregulation (MAPOPT).
  • Correlated blood pressure deviation from MAPOPT with MRI-assessed brain injury, adjusting for covariates.

Main Results:

  • Blood pressure deviation from MAPOPT correlated with neurologic injury across various brain regions, independent of birth asphyxia.
  • Increased duration and magnitude of blood pressure below MAPOPT were linked to greater white matter and paracentral gyrus injury.
  • Maintaining blood pressure within MAPOPT range correlated with reduced injury in white matter, basal ganglia, and brainstem.

Conclusions:

  • Blood pressure management guided by autoregulation monitoring is associated with reduced brain injury in HIE, often irrespective of initial asphyxia severity.
  • Targeting hemodynamic ranges to optimize autoregulation may serve as an effective adjunctive therapy to hypothermia for HIE.