The role of CO(2) and central chemoreception in the control of breathing in the fetus and the neonate.
Central chemoreception is active early in development and likely drives fetal breathing movements, which are influenced by a combination of behavioral state and powerful inhibition. In the premature human infant and newborn rat ventilation increases in response to CO(2); in the rat the sensitivity of the response increases steadily after ∼P12. The premature human infant is more vulnerable to instability than the newborn rat and exhibits periodic breathing that is augmented by hypoxia and eliminated by breathing oxygen or CO(2) or the administration of respiratory stimulants. The sites of central chemoreception active in the fetus are not known, but may involve the parafacial respiratory group which may be a precursor to the adult RTN. The fetal and neonatal rat brainstem-spinal-cord preparations promise to provide important information about central chemoreception in the developing rodent and will increase our understanding of important clinical problems, including The Sudden Infant Death Syndrome, Congenital Central Hypoventilation Syndrome, and periodic breathing and apnea of prematurity.
Darnall
Robert A
RA
Departments of Physiology and Neurobiology and Pediatrics, Dartmouth Medical School, Borwell Building, Lebanon, NH 03756, USA. robert.a.darnall@hitchcock.org
D000818:Animals; D000831:Animals, Newborn; D001921:Brain / Q000196:embryology / Q000254:growth & development / Q000502:physiology*; D002245:Carbon Dioxide / Q000097:blood*; D002628:Chemoreceptor Cells / Q000502:physiology*; D047108:Embryonic Development / Q000502:physiology*; D047109:Fetal Development / Q000502:physiology*; D005333:Fetus; D006801:Humans; D007231:Infant, Newborn; D012143:Respiratory Physiological Phenomena
D002245:Carbon Dioxide
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