Neonatal Cerebral Oxygenation After Exposure to Oxygen Evaluated With the INVOS Oximeter

Study Overview
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Brief Summary
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Due to the increased risk of brain damage, continuous monitoring of the cerebral oxygenation is interesting. The investigators will evaluate the capability of the INVOS Oximeter to detect induced changes in the cerebral regional saturation. The purpose of the study is to investigate our hypothesis that cerebral vasoconstriction after oxygen exposure is prolonged in preterm infants compared to term infants.

Detailed Description
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Preterm infants are at increased risk of brain damage compared with term infants, and cerebral hypoxia is considered to have an important role. The preterm infants are at increased risk of respiratory distress, episodes with low oxygenation, mechanical ventilation, risk of hypocapnia and labile or low blood pressure. These conditions can affect the microcirculation and hence the oxygenation of the brain. Hyperoxia is also a point of interest, since high levels of oxygen can cause vasoconstriction. The investigators will examine the normal physiological cerebral response to exposure of oxygen in a group of preterm infants with a gestational age (GA) of 32-37 weeks and a group of term infants. The investigators will do dynamic research with continuously monitoring of the cerebral oxygenation using the INVOS® Cerebral/Somatic Oximeter (Near InfraRed Spectroscopy (NIRS)). Reproducibility is examined by repeated measurements. There will be no follow-up.

Official Title
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Oxygenation of the Neonatal Brain - a Study Using the INVOS Oximeter

Conditions
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Response to Hyperoxia

Intervention / Treatment
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* Drug: Oxygen


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Newborns with a gestational age of 32-40 weeks Clinically stable +/- CPAP with a oxygen limit below 30% Parental consent Exclusion Criteria: Severe birth asphyxia Prohibition of oxygen exposure

Ages Eligible for Study
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Minimum Age: 1 Hour
Maximum Age: 4 Weeks

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Oxygen + Cerebral NIRS<br>Induced changes in oxygen supply (100% vs. room air). Continuously monitoring of cerebral oxygen saturation. | Drug: Oxygen<br>* Oxygen exposure (100% oxygen) for 5 minutes, then 25 minutes with room air. Repeated twice. Continuously monitoring of the cerebral oxygen saturation (NIRS).5 replacements of sensor for reproducibility.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Changes from baseline of cerebral oxygen saturation after oxygen exposure. |  | Measurements will take between 30 minutes and 3 hours depending of situation. Measurements within the first 4 weeks of life. No follow-up. | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Preterm, Newborn, Neonate, Cerebral oxygenation, Oxygen