Production and Inactivation of Catecholamines During Hypoxia and Recovery

  • O. Schwab
  • E. Kastendieck
  • R. Paulick
  • H. Wernze

Abstract

It is well established that levels of fetal free catecholamines, i.e. norepinephrine (NE), epinephrine (E), and dopamine (DA) rise during hypoxia. High levels of free catecholamines cause a redistribution of fetal cardiac output favoring the brain, the heart, the adrenal glands, and the umbilical circulation (Cohn et al. 1974). Moreover, free catecholamines effect an increase in pulmonary surfactant effux (Lawson et al. 1978) and inhibit fetal pulmonary fluid secretion (Walters and Olver 1978). Finally, free catecholamines play a part in perinatal glucose homeostasis (Sperling et al. 1984). However, little is known about the inactivation of catecholamines. Therefore, in order to investigate the behavior of catecholamines during hypoxia and recovery and to study mechanisms of catecholamine inactivation, we performed experiments with chronically instrumented sheep and measured catecholamines in the cord blood of human newborns. The aim of our study was to answer the following four questions:
  1. 1.

    At what degree of hypoxia do catecholamine levels rise in the sheep fetus?

     
  2. 2.

    How quickly are free catecholamines inactivated in the sheep fetus at the end of hypoxia?

     
  3. 3.

    What role does sulfoconjugation of free catecholamines play in catecholamine inactivation in human newborns?

     
  4. 4.

    What is the role of the human placenta in catecholamine inactivation?

     

Keywords

Surfactant Catheter Dopamine Lactate Migraine 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • O. Schwab
    • 1
  • E. Kastendieck
    • 2
  • R. Paulick
    • 2
  • H. Wernze
    • 3
  1. 1.Department of PediatricsUniversity of WürzburgWürzburgGermany
  2. 2.Department of Gynecology and ObstetricsUniversity of WürzburgWürzburgGermany
  3. 3.Department of Internal MedicineUniversity of WürzburgWürzburgGermany

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