Cerebral Oxygenation During Repetitive Apnea in Newborn Piglets

  • Gregory Schears
  • Jennifer Creed
  • Tatiana Zaitseva
  • Steven Schultz
  • David F. Wilson
  • Anna Pastuszko
Conference paper
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 566)


This study examined the effect of repetitive apnea on brain oxygen pressure in newborn piglets. Each animal was given 10 episodes of apnea, initiated by disconnecting them from the ventilator and completed by reconnecting them to the ventilation circuit. The apneic episodes were ended 30 sec after the heart rate reached the bradycardic threshold of 60 beats per min. The oxygen pressure in the microvasculature of the cortex was measured by oxygen-dependent quenching of the phosphorescence. In all experiments, the blood pressure, body temperature, and heart rate were continuously monitored. Arterial blood samples were taken throughout the experiment and the blood pH, PaO2 and PaCO2 were measured.

During pre-apnea, cortical oxygen was 55.1 ± 6.4 (SEM, n = 7) mm Hg and decreased during each apnea to 8.1 ± 2.8 mm Hg. However, the values of cortical oxygen varied during recovery periods. Maximal oxygen levels during recovery from the first two apneic episodes were 76.8 ± 12 mm Hg and 69.6 ± 9 mm Hg, respectively, values higher than pre-apnea. Cortical oxygen pressure then progressively decreased following consequent apnea.

In conclusion, the data show that repetitive apnea caused a progressive decrease in cortical oxygen levels in the brain of newborn piglets. This deficit in brain oxygenation can be at least partly responsible for the neurological side effects of repetitive apnea.


Oxygen Pressure Cerebral Oxygenation Perinatal Asphyxia Newborn Piglet Fetal Sheep 
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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Gregory Schears
  • Jennifer Creed
  • Tatiana Zaitseva
  • Steven Schultz
  • David F. Wilson
  • Anna Pastuszko

There are no affiliations available

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