Roles of parasympathetic outflow and sympathetic outflow in the cardiovascular response to brief umbilical cord occlusion in fetal sheep.

Fetal heart rate (FHR) deceleration is the most common change seen during labor. The role of the autonomic nervous system in regulating the fetal cardiovascular response during multiple uterine contractions has been well-established. However, the mechanism underlying the hemodynamic response remains...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Morgan Recher, Arthur Lauriot Dit Prevost, Dyuti Sharma, Julien De Jonckheere, Charles Garabedian, Laurent Storme
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/23c3734757e64cae8181d116e0dad185
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:23c3734757e64cae8181d116e0dad185
record_format	dspace
spelling	oai:doaj.org-article:23c3734757e64cae8181d116e0dad1852021-12-02T20:09:38ZRoles of parasympathetic outflow and sympathetic outflow in the cardiovascular response to brief umbilical cord occlusion in fetal sheep.1932-620310.1371/journal.pone.0254155https://doaj.org/article/23c3734757e64cae8181d116e0dad1852021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0254155https://doaj.org/toc/1932-6203Fetal heart rate (FHR) deceleration is the most common change seen during labor. The role of the autonomic nervous system in regulating the fetal cardiovascular response during multiple uterine contractions has been well-established. However, the mechanism underlying the hemodynamic response remains unclear and the specific reflex that mediates the cardiovascular modifications is still controversial. This study aimed to determine the role of the sympathetic and parasympathetic systems on fetal hemodynamics in complete cord occlusion. Chronically instrumented fetal sheep were randomized to receive an intravenous injection of atropine 2.5 mg (n = 8), propranolol 5 mg (n = 7), atropine and propranolol (n = 7), or a control protocol (n = 9), followed by three episodes of 1-minute umbilical cord occlusion repeated every 5 minutes. Cord compression induces a rapid decrease in the FHR and a rapid increase in MAP. The decrease in FHR is caused by an increase in parasympathetic activity, (atropine and atropine-propranolol abolish the FHR response to the occlusion). The change in FHR during occlusion was not modified by propranolol injection, showing no effect of sympathetic tone. The increase in MAP during occlusion was similar in the four protocols. After releasing occlusion, the FHR was still lower than that at baseline due to a sustained parasympathetic tone. Suppression of the parasympathetic output to the cardiovascular system unmasks an increase in the FHR above baseline values. The lower FHR with the propranolol protocol further supports an increase in myocardial β-adrenoceptor stimulation after cord release. The increase in MAP after cord release was similar in the four protocols, except after the early stage of interocclusion period in atropine protocol. Four minutes after cord release, the FHR returned to baseline irrespective of the drugs that were infused, thereby showing recovery of ANS control. Blood gases (pH, PaCO2, PaO2) and plasma lactate concentrations was similar between the four protocols at the end of three applications of UCO. Complete cord compression-induced deceleration is likely due to acute activation of parasympathetic output. β-adrenoceptor activity is involved in the increase in FHR after cord release. Understanding the reflexes involved in FHR deceleration may help us understand the mechanisms underlying fetal autonomic adaptation during cord occlusion.Morgan RecherArthur Lauriot Dit PrevostDyuti SharmaJulien De JonckheereCharles GarabedianLaurent StormePublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 7, p e0254155 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Morgan Recher Arthur Lauriot Dit Prevost Dyuti Sharma Julien De Jonckheere Charles Garabedian Laurent Storme Roles of parasympathetic outflow and sympathetic outflow in the cardiovascular response to brief umbilical cord occlusion in fetal sheep.
description	Fetal heart rate (FHR) deceleration is the most common change seen during labor. The role of the autonomic nervous system in regulating the fetal cardiovascular response during multiple uterine contractions has been well-established. However, the mechanism underlying the hemodynamic response remains unclear and the specific reflex that mediates the cardiovascular modifications is still controversial. This study aimed to determine the role of the sympathetic and parasympathetic systems on fetal hemodynamics in complete cord occlusion. Chronically instrumented fetal sheep were randomized to receive an intravenous injection of atropine 2.5 mg (n = 8), propranolol 5 mg (n = 7), atropine and propranolol (n = 7), or a control protocol (n = 9), followed by three episodes of 1-minute umbilical cord occlusion repeated every 5 minutes. Cord compression induces a rapid decrease in the FHR and a rapid increase in MAP. The decrease in FHR is caused by an increase in parasympathetic activity, (atropine and atropine-propranolol abolish the FHR response to the occlusion). The change in FHR during occlusion was not modified by propranolol injection, showing no effect of sympathetic tone. The increase in MAP during occlusion was similar in the four protocols. After releasing occlusion, the FHR was still lower than that at baseline due to a sustained parasympathetic tone. Suppression of the parasympathetic output to the cardiovascular system unmasks an increase in the FHR above baseline values. The lower FHR with the propranolol protocol further supports an increase in myocardial β-adrenoceptor stimulation after cord release. The increase in MAP after cord release was similar in the four protocols, except after the early stage of interocclusion period in atropine protocol. Four minutes after cord release, the FHR returned to baseline irrespective of the drugs that were infused, thereby showing recovery of ANS control. Blood gases (pH, PaCO2, PaO2) and plasma lactate concentrations was similar between the four protocols at the end of three applications of UCO. Complete cord compression-induced deceleration is likely due to acute activation of parasympathetic output. β-adrenoceptor activity is involved in the increase in FHR after cord release. Understanding the reflexes involved in FHR deceleration may help us understand the mechanisms underlying fetal autonomic adaptation during cord occlusion.
format	article
author	Morgan Recher Arthur Lauriot Dit Prevost Dyuti Sharma Julien De Jonckheere Charles Garabedian Laurent Storme
author_facet	Morgan Recher Arthur Lauriot Dit Prevost Dyuti Sharma Julien De Jonckheere Charles Garabedian Laurent Storme
author_sort	Morgan Recher
title	Roles of parasympathetic outflow and sympathetic outflow in the cardiovascular response to brief umbilical cord occlusion in fetal sheep.
title_short	Roles of parasympathetic outflow and sympathetic outflow in the cardiovascular response to brief umbilical cord occlusion in fetal sheep.
title_full	Roles of parasympathetic outflow and sympathetic outflow in the cardiovascular response to brief umbilical cord occlusion in fetal sheep.
title_fullStr	Roles of parasympathetic outflow and sympathetic outflow in the cardiovascular response to brief umbilical cord occlusion in fetal sheep.
title_full_unstemmed	Roles of parasympathetic outflow and sympathetic outflow in the cardiovascular response to brief umbilical cord occlusion in fetal sheep.
title_sort	roles of parasympathetic outflow and sympathetic outflow in the cardiovascular response to brief umbilical cord occlusion in fetal sheep.
publisher	Public Library of Science (PLoS)
publishDate	2021
url	https://doaj.org/article/23c3734757e64cae8181d116e0dad185
work_keys_str_mv	AT morganrecher rolesofparasympatheticoutflowandsympatheticoutflowinthecardiovascularresponsetobriefumbilicalcordocclusioninfetalsheep AT arthurlauriotditprevost rolesofparasympatheticoutflowandsympatheticoutflowinthecardiovascularresponsetobriefumbilicalcordocclusioninfetalsheep AT dyutisharma rolesofparasympatheticoutflowandsympatheticoutflowinthecardiovascularresponsetobriefumbilicalcordocclusioninfetalsheep AT juliendejonckheere rolesofparasympatheticoutflowandsympatheticoutflowinthecardiovascularresponsetobriefumbilicalcordocclusioninfetalsheep AT charlesgarabedian rolesofparasympatheticoutflowandsympatheticoutflowinthecardiovascularresponsetobriefumbilicalcordocclusioninfetalsheep AT laurentstorme rolesofparasympatheticoutflowandsympatheticoutflowinthecardiovascularresponsetobriefumbilicalcordocclusioninfetalsheep
_version_	1718375050559619072

Roles of parasympathetic outflow and sympathetic outflow in the cardiovascular response to brief umbilical cord occlusion in fetal sheep.

Ejemplares similares