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Continuous cerebral electrical impedance monitoring in sick preterm infants
P B Colditz1, I A Valimaki, D Murphy
1Department of Paediatrics, University of Oxford, UK.
Insights
Continuous monitoring of cerebral electrical impedance in preterm infants did not predict brain injury or poor outcomes. Variability in impedance and blood pressure showed some association, but the method is not yet useful for identifying at-risk neonates.
Area of Science:
- Neonatal neurology
- Biomedical engineering
Background:
- Sick preterm infants (<1500g) face risks of intraventricular haemorrhage (IVH) and periventricular leucomalacia (PVL).
- Early identification of neurological complications is crucial for timely intervention.
Purpose of the Study:
- To determine if cerebral electrical impedance (dZp) patterns or variability could identify preterm infants at risk for IVH, PVL, or poor neurological outcome.
- To assess the feasibility and utility of continuous dZp monitoring in sick preterm neonates.
Main Methods:
- Continuous measurement of cerebral electrical impedance (dZp) and intra-arterial blood pressure in 26 ventilated preterm infants (<1500g) for 48 hours post-birth.
- Diagnosis of IVH and PVL via ultrasound every 6 hours.
- Analysis of dZp patterns and variability, alongside blood pressure variability, using multiple linear regression.
Main Results:
- No distinct dZp patterns correlated with IVH or PVL onset.
- While technically feasible, continuous dZp monitoring did not distinguish between infants with normal outcomes versus those developing IVH, PVL, or poor neurological outcomes.
- The coefficient of variation for both dZp and blood pressure was significantly associated with IVH and neurological outcome.
Conclusions:
- Continuous cerebral electrical impedance monitoring is not currently a reliable method for predicting IVH, PVL, or poor neurological outcomes in sick preterm infants.
- Further research may explore the predictive value of impedance and blood pressure variability in neonatal brain injury.
Abstract:
Cerebral electrical impedance (dZ) and intra-arterial blood pressure were measured continuously during the first 48 h after birth in 26 sick ventilated preterm infants with a birth weight less than 1500 g. The aim was to establish whether any patterns of dZp or the variability of either blood pressure or dZp would allow identification of those infants who developed intraventricular haemorrhage (IVH), periventricular leucomalacia (PVL) or a poor neurological outcome. IVH and PVL were diagnosed by ultrasound image obtained every 6 h. Cerebral electrical impedance recordings were unsuitable for analysis in three patients and a further three died within 14 h of birth. In the remaining 20 patients, no step changes that may have been related to the onset of IVH or PVL were evident and whilst three patterns of dZp were identified, they were not useful in distinguishing between normal infants or those who developed IVH, PVL or had a poor neurological outcome. Using multiple linear regression, the coefficient of variation of dZp was significantly associated with both IVH and outcome, as was the coefficient of variation of blood pressure. Continuous measurement of cerebral electrical impedance, whilst technically feasible in sick preterm infants, was not found useful as a method of identifying those who developed IVH, PVL or had a poor neurological outcome.