Optimizing Cerebral Autoregulation May Decrease Neonatal Regional Hypoxic-Ischemic Brain Injury.

Abstract:

BACKGROUND:Therapeutic hypothermia provides incomplete neuroprotection for neonatal hypoxic-ischemic encephalopathy (HIE). We examined whether hemodynamic goals that support autoregulation are associated with decreased brain injury and whether these relationships are affected by birth asphyxia or vary by anatomic region. METHODS:Neonates cooled for HIE received near-infrared spectroscopy autoregulation monitoring to identify the mean arterial blood pressure with optimized autoregulatory function (MAPOPT). Blood pressure deviation from MAPOPT was correlated with brain injury on MRI after adjusting for the effects of arterial carbon dioxide, vasopressors, seizures, and birth asphyxia severity. RESULTS:Blood pressure deviation from MAPOPT related to neurologic injury in several regions independent of birth asphyxia severity. Greater duration and deviation of blood pressure below MAPOPT were associated with greater injury in the paracentral gyri and white matter. Blood pressure within MAPOPT related to lesser injury in the white matter, putamen and globus pallidus, and brain stem. Finally, blood pressures that exceeded MAPOPT were associated with reduced injury in the paracentral gyri. CONCLUSIONS:Blood pressure deviation from optimal autoregulatory vasoreactivity was associated with MRI markers of brain injury that, in many regions, were independent of the initial birth asphyxia. Targeting hemodynamic ranges to optimize autoregulation has potential as an adjunctive therapy to hypothermia for HIE.

journal_name

Dev Neurosci

authors

Lee JK,Poretti A,Perin J,Huisman TAGM,Parkinson C,Chavez-Valdez R,O'Connor M,Reyes M,Armstrong J,Jennings JM,Gilmore MM,Koehler RC,Northington FJ,Tekes A

doi

10.1159/000452833

subject

Has Abstract

pub_date

2017-01-01 00:00:00

pages

248-256

issue

1-4

eissn

0378-5866

issn

1421-9859

pii

000452833

journal_volume

39

pub_type

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