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Updated: Jan 15, 2026
A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy
Published on: May 16, 2015
Neonatal cerebral hemodynamics under elevated intracranial pressure: a near-infrared spectroscopy study in piglets
Sule Karagulleoglu-Kunduraci1,2, Farah Kamar1,3, Rasa Eskandari1,3
1Department of Medical Biophysics, Western University, London, ON, Canada.
Insights
Non-invasive optical spectroscopy effectively detects elevated intracranial pressure (ICP) in piglets by monitoring cerebral blood flow (CBF) and oxygenation. This technology shows promise for early detection and management of ICP in neonatal critical care.
Area of Science:
- Biomedical Engineering
- Neonatal Physiology
- Optical Diagnostics
Background:
- Elevated intracranial pressure (ICP) is a critical complication in premature infants, impacting cerebral hemodynamics.
- Current monitoring methods for ICP and cerebral blood flow (CBF) are often invasive.
- Non-invasive monitoring of CBF and oxygenation is crucial for early detection and management of ICP.
Purpose of the Study:
- To evaluate the sensitivity of non-invasive optical spectroscopy to ICP-induced hemodynamic changes.
- To assess the potential of a hybrid optical system for bedside neuromonitoring in neonates.
Main Methods:
- A hybrid system combining broadband near-infrared spectroscopy (bNIRS) and diffuse correlation spectroscopy (DCS) was employed.
- Cerebral oxygenation and blood flow were monitored in newborn piglets as ICP was incrementally increased.
- Key parameters measured included CBF, oxygen saturation (StO2), and hemoglobin derivatives.
Main Results:
- Elevated ICP correlated with reduced cerebral blood flow (CBF) and oxygen saturation (StO2).
- Cerebral oxygen metabolism, indicated by oxCCO, remained stable, suggesting preserved metabolic function.
- A breakpoint was identified where ICP changes induced more significant hemodynamic alterations.
Conclusions:
- The bNIRS/DCS system effectively detects ICP-induced changes in cerebral hemodynamics.
- This non-invasive optical technique shows significant promise for neonatal neuromonitoring in critical care settings.
- Identifying hemodynamic breakpoints can guide interventions and potentially prevent injury.
Background:
Elevated intracranial pressure (ICP) is a common postnatal complication in premature infants, particularly those with very low birth weight, and it is associated with hemodynamic impairments. Continuous monitoring of cerebral blood flow (CBF) and oxygenation may enable early detection and inform clinical management. We hypothesized that non-invasive, bedside optical spectroscopy measurements of CBF and oxygenation are sensitive to abrupt increases in ICP.
Methods:
A hybrid optical system combining broadband near-infrared spectroscopy (bNIRS) and diffuse correlation spectroscopy (DCS) was used to monitor cerebral oxygenation and blood flow in 7 newborn piglets. ICP was gradually increased through saline infusion into the ventricles, and changes in CBF, oxygen saturation (StO2), oxyhemoglobin (HbO₂), deoxyhemoglobin (Hb), and the oxidation state of cytochrome-c-oxidase (oxCCO) were continuously monitored with the hybrid optical device.
Results:
Elevated ICP was associated with decreased StO2 and CBF, while oxCCO remained stable, indicating unchanged cerebral oxygen metabolism. Across all parameters, segmented linear regression revealed a breakpoint at which ICP alterations led to steeper slopes and in turn, larger hemodynamic changes.
Conclusions:
This study demonstrates that bNIRS/DCS can effectively detect ICP-induced changes in cerebral hemodynamics and shows promise as a non-invasive neuromonitoring tool for neonatal critical care.
Impact:
Tissue optical spectroscopy can detect the hemodynamic effects of elevated ICP and could be used to guide interventions aimed at mitigating these effects. Breakpoints identified in hemodynamics highlight a compensatory mechanism, after which ICP changes lead to a larger impact on cerebral hemodynamics. Elevated ICP leads to distinct hemodynamic changes that may precede injury. This study supports the use of tissue optical spectroscopy for non-invasive neonatal neuromonitoring.
