The central effects of thyrotropin-releasing hormone on the breathing movements and electrocortical activity of the fetal sheep.

Abstract:

:The fetal respiratory and electrocortical effects of thyrotropin-releasing hormone (TRH) administered into the lateral cerebral ventricles, have been investigated in chronically catheterized unanesthetized fetal sheep at 125-140 days of gestation. Stimulatory effects on fetal breathing movements were seen at doses as low as a lug bolus. TRH given as a 5-micrograms bolus followed by a 10 micrograms/h infusion for 2 h induced a rapid switch to significantly faster, deeper, and continuous fetal breathing movements, while the electrocorticogram remained episodic. Fetal breathing movements did not stop during hypoxia. TRH given as a 2-micrograms bolus followed by a 4 micrograms/h infusion or as a 5-micrograms bolus followed by a 5 micrograms/h infusion induced the same stimulation of FBMs, but breathing essentially remained episodic, state related and inhibited by hypoxia. As hypothermia presumably induces a surge in TRH secretion at birth it is possible that TRH has some role in the switch from fetal to postnatal breathing patterns.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Bennet L,Gluckman PD,Johnston BM

doi

10.1203/00006450-198801000-00016

subject

Has Abstract

pub_date

1988-01-01 00:00:00

pages

72-5

issue

1

eissn

0031-3998

issn

1530-0447

journal_volume

23

pub_type

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