The Relationship Between Electrocerebral Activity and Cerebral Fractional Tissue Oxygen Extraction in Preterm Infants

Hendrik J. Ter Horst*, Elise A. Verhagen, Paul Keating, Arend F. Bos

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

23 Citations (Scopus)

Abstract

Impaired cerebral oxygen delivery may cause cerebral damage in preterm infants. At lower levels of cerebral perfusion and oxygen concentration, electrocerebral activity is disturbed. The balance between cerebral oxygen delivery and oxygen use can be measured by near-infrared spectroscopy (NIRS), and electrocerebral activity can be measured by amplitude-integrated EEG (aEEG). Our aim was to determine the relationship between regional cerebral tissue oxygen saturation (r(c)SO(2)), fractional tissue oxygen extraction (FTOE), and aEEG. We recorded longitudinal digital aEEG and r(c)SO(2) prospectively in 46 preterm infants (mean GA 29.5 wk, SD 1.7) for 2 hr on the 1st to 5th, 8th, and 15th d after birth. We excluded infants with germinal matrix hemorrhage exceeding grade I and recordings of infants receiving inotropes. FTOE was calculated using transcutaneous arterial oxygen saturation (tcSaO(2)) and r(c)SO(2) values: (tcSaO(2) - r(c)SO(2))/tcSaO(2). aEEG was assessed by calculating the mean values of the 5th, 50th, and 95th centiles of the aEEG amplitudes. The aEEG amplitude centiles changed with increasing GA. FTOE and aEEG amplitude centiles increased significantly with postnatal age. More mature electrocerebral activity was accompanied by increased FTOE. FTOE also increased with increasing postnatal age and decreasing Hb levels. (Pediatr Res 70: 384-388, 2011)

Original languageEnglish
Pages (from-to)384-388
Number of pages5
JournalPediatric Research
Volume70
Issue number4
Publication statusPublished - Oct-2011

Keywords

  • NEAR-INFRARED SPECTROSCOPY
  • INTEGRATED ELECTROENCEPHALOGRAPHIC ACTIVITY
  • GESTATIONAL-AGE
  • MATURATION
  • SATURATION
  • YOUNGER
  • INDEX
  • BIRTH
  • LIFE

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