Related Experiment Video
Updated: May 10, 2026
08:21
Effects of Blast-induced Neurotrauma on Pressurized Rodent Middle Cerebral Arteries
Published on: April 1, 2019
7.3K
STARSHIP Part 2: Disturbed Pressure Reactivity Duration and Magnitude in Pediatric Severe Traumatic Brain
Claudia Ann Smith1, Stefan Yu Bögli1, Michał Placek1
1Department of Clinical Neurosciences, University of Cambridge, Cambridge, United Kingdom.
Journal of Neurotrauma
|August 22, 2025
Summary
Cerebral autoregulation (CA) monitoring in pediatric traumatic brain injury (pTBI) is crucial. Impaired CA, measured by pressure reactivity index (PRx) dose and time above threshold, predicts poor outcomes in children with severe TBI.
Area of Science:
- Pediatric critical care medicine
- Neurocritical care
- Cerebrovascular physiology
Background:
- Cerebral autoregulation (CA) is vital for maintaining cerebral blood flow (CBF) during blood pressure changes.
- CA dysfunction increases secondary brain injury risk, especially in pediatric traumatic brain injury (pTBI).
- Limited research exists on CA dynamics in pTBI.
Purpose of the Study:
- To characterize PRx disturbances using dose metrics in children with severe TBI.
- To investigate the association between PRx metrics and patient outcomes.
- To identify robust indicators of outcome in pTBI.
Main Methods:
- Prospective, multicenter study (STARSHIP) involving 135 children with TBI.
- Calculation of PRx dose and percentage time above thresholds (0-0.4).
- Statistical analysis including regression and propensity score matching to assess outcome associations.
Main Results:
- Patients with poor outcomes showed higher PRx dose and percentage time above threshold.
- Elevated PRx metrics were observed in poor outcome groups during the first week post-injury.
- Percentage time with PRx >0 independently predicted 12-month outcome.
Conclusions:
- PRx metrics, particularly percentage time above threshold, are strong predictors of outcome in severe pTBI.
- Impaired pressure reactivity duration is robustly associated with dichotomized 12-month outcome.
- Real-time CA monitoring may guide interventions in severe pTBI.
Keywords:
cerebral autoregulationmultimodality monitoringpediatric traumatic brain injurypressure reactivity indexMore Related Videos
Related Concept Videos
01:28Traumatic Brain Injury l: Introduction
DefinitionTraumatic brain injury, or TBI, is a disturbance of normal brain function induced by an external mechanical force, such as a direct blow to the head or a penetrating injury. It can affect both brain structure and function, producing a wide range of clinical outcomes. TBI is a heterogeneous condition, meaning its effects may differ based on the type, location, and severity of the injury.Basis of ClassificationTBI is classified based on severity, injury mechanism, or pathophysiology. In...
01:25Secondary Spinal Cord Injury llI: Pathophysiology
Early Ischemia and Ionic ImbalanceWithin minutes of spinal cord injury, a secondary cascade begins, progressing over hours to weeks. Vascular damage reduces blood flow, causing ischemia and mitochondrial dysfunction. ATP depletion leads to ion pump failure, membrane depolarization, sodium influx, potassium efflux, and water accumulation, resulting in cellular swelling. Increased intracellular calcium further disrupts mitochondria and accelerates cellular injury.Excitotoxicity and Neuronal...