OBJECTIVE: The early detection and stratification of potential hypoxic ischaemia (HI) injury in neonates are crucial for reducing the risk of neural disability. This study investigates early changes in brain function caused by acute HI of varying severities in the neonatal pig. METHODS: Two non-invasive techniques, amplitude-integrated electroencephalogram (aEEG) and near-infrared spectroscopy (NIRS), were used to monitor electrocortical and cerebral haemodynamic function, respectively. The fraction of inspired oxygen (FiO(2)) was varied to produce different HI severities. The sensitivity and HI correlation of these methods were systematically analysed to assess their abilities to both detect injury early and assess HI severity accurately. RESULTS: The tissue oxygen index measured via NIRS detected acute changes in cerebral oxygenation and was highly sensitive to HI (sensitivity=0.97), whereas aEEG was comparatively insensitive to HI. On the other hand, aEEG measurements correlated well with FiO(2) during the entire HI event as well as the 3-h recovery period (R=0.43-0.61). NIRS measurements did not correlate well with FiO(2). CONCLUSIONS: Parameters measured via aEEG and NIRS displayed different time profiles during and following the HI event. SIGNIFICANCE: These results highlight the potential advantage of using aEEG and NIRS in conjunction to monitor neonatal brain function, and provide an objective and rigorous method for the characterisation of cerebral function both during and following HI insults.
OBJECTIVE: The early detection and stratification of potential hypoxic ischaemia (HI) injury in neonates are crucial for reducing the risk of neural disability. This study investigates early changes in brain function caused by acute HI of varying severities in the neonatal pig. METHODS: Two non-invasive techniques, amplitude-integrated electroencephalogram (aEEG) and near-infrared spectroscopy (NIRS), were used to monitor electrocortical and cerebral haemodynamic function, respectively. The fraction of inspired oxygen (FiO(2)) was varied to produce different HI severities. The sensitivity and HI correlation of these methods were systematically analysed to assess their abilities to both detect injury early and assess HI severity accurately. RESULTS: The tissue oxygen index measured via NIRS detected acute changes in cerebral oxygenation and was highly sensitive to HI (sensitivity=0.97), whereas aEEG was comparatively insensitive to HI. On the other hand, aEEG measurements correlated well with FiO(2) during the entire HI event as well as the 3-h recovery period (R=0.43-0.61). NIRS measurements did not correlate well with FiO(2). CONCLUSIONS: Parameters measured via aEEG and NIRS displayed different time profiles during and following the HI event. SIGNIFICANCE: These results highlight the potential advantage of using aEEG and NIRS in conjunction to monitor neonatal brain function, and provide an objective and rigorous method for the characterisation of cerebral function both during and following HI insults.
Authors: L Chalak; L Hellstrom-Westas; S Bonifacio; T Tsuchida; V Chock; M El-Dib; An N Massaro; A Garcia-Alix Journal: Semin Fetal Neonatal Med Date: 2021-07-28 Impact factor: 3.726
Authors: Anne M Plomgaard; Wim van Oeveren; Tue H Petersen; Thomas Alderliesten; Topun Austin; Frank van Bel; Manon Benders; Olivier Claris; Eugene Dempsey; Axel Franz; Monica Fumagalli; Christian Gluud; Cornelia Hagmann; Simon Hyttel-Sorensen; Petra Lemmers; Adelina Pellicer; Gerhard Pichler; Per Winkel; Gorm Greisen Journal: Pediatr Res Date: 2015-12-17 Impact factor: 3.756