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Updated: Dec 12, 2025
Non-invasive Optical Measurement of Cerebral Metabolism and Hemodynamics in Infants
Published on: March 14, 2013
Cerebral Oxygenation and Autoregulation in Very Preterm Infants Developing IVH During the Transitional Period: A
Anna Giulia Cimatti1, Silvia Martini1,2, Silvia Galletti1,2
1Neonatal Intensive Care Unit, S. Orsola-Malpighi University Hospital, Bologna, Italy.
Insights
Transient changes in cerebral oxygenation and oxygen extraction precede intraventricular hemorrhage (IVH) in preterm infants. These findings suggest early impairment of cerebral autoregulation, highlighting the need for further research in neonatal intensive care.
Area of Science:
- Neonatal Physiology
- Neurology
- Medical Imaging
Background:
- The transitional period post-preterm birth (first 72 hours) is marked by hemodynamic instability, a risk factor for neurological complications like intraventricular hemorrhage (IVH).
- Impaired cerebral autoregulation is implicated in IVH pathogenesis, with highest incidence during this critical transitional phase.
Purpose of the Study:
- To investigate differences in cerebral autoregulation and oxygenation patterns related to IVH development in very preterm infants during the transitional period.
- To assess if cerebral oxygenation (CrSO2) and oxygen extraction (cFTOE) differ between infants who develop IVH and those who do not.
Main Methods:
- Simultaneous monitoring of cerebral oxygenation (CrSO2) via near-infrared spectroscopy and cardiorespiratory parameters in infants <32 weeks' gestation for 72 hours.
- Calculation of cerebral fractional oxygen extraction (cFTOE) and tissue oxygenation-heart rate reactivity index (TOHRx) as markers of cerebrovascular reactivity.
- Comparison of CrSO2 and cFTOE between infants with and without IVH, and analysis of TOHRx before and after IVH detection.
Main Results:
- Eight of twenty enrolled preterm infants developed IVH, with detection at a median of 40 hours.
- Lower cerebral oxygenation (CrSO2) and higher cerebral fractional oxygen extraction (cFTOE) were observed in IVH infants during specific periods within the first 72 hours.
- Cerebral autoregulation marker (TOHRx) was significantly higher before IVH onset.
Conclusions:
- Transient alterations in cerebral oxygenation and extraction precede IVH development in preterm infants.
- These changes may indicate an early impairment of cerebral autoregulation in infants who develop IVH.
- Larger studies are warranted to validate these preliminary findings on neonatal brain injury.
Abstract:
Background: The transitional period, defined as the first 72 h after preterm birth, is often characterized by a significant hemodynamic instability, which represents an important risk factor for such neurological complications of prematurity as intraventricular hemorrhage (IVH). The impairment of cerebral autoregulation plays a key role in the pathogenesis of IVH, whose incidence is highest during the transitional period. This pilot study aimed to evaluate whether patterns of cerebral autoregulation and oxygenation differ in relation to IVH development in very preterm infants during the transitional period. Methods: Infants <32 weeks' gestation were enrolled within 12 h from birth. A simultaneous monitoring of cerebral oxygenation (CrSO2) by near-infrared spectroscopy and of heart rate and peripheral oxygen saturation by pulse oximetry was performed over the first 72 h. Cerebral fractional oxygen extraction (cFTOE) and tissue oxygenation-heart rate reactivity index (TOHRx), which represents a marker of cerebrovascular reactivity, were calculated. Daily cranial and cardiac ultrasound scans were performed, in order to assess the hemodynamic status and to detect a possible IVH onset. CrSO2 and cFTOE, clustered on 6-hour epochs, were compared between infants who developed IVH during the study period and those who did not. A between-group comparison of TOHRx before and after IVH detection was also performed. Results: Twenty preterm infants with a median gestational age of 27 weeks (interquartile range, IQR: 25-30 weeks) and median birth weight of 895 g (IQR: 822-1208 g) were enrolled. Of these, 8 developed IVH. The median age at IVH detection was 40 h (IQR: 30-48 h). Pre-IVH TOHRx was significantly higher compared to matched control periods (p <0.001). CrSO2 was significantly lower from 12 to 30 h and from 42 h onwards in cases compared to controls; however, a temporary CrSO2 rise preceded IVH detection. Similarly, cFTOE was significantly higher in IVH infants from 12 to 30 h and from 48 to 72 h, with a transient decrease between the two periods. Conclusions: In preterm infants during the transitional period, the development of IVH is preceded by transient changes in cerebral oxygenation and oxygen extraction which, in turn, may underlie an early impairment of cerebral autoregulation. Larger studies are needed to confirm these preliminary findings.
