Perinatal adaptive response of the adrenal and carotid blood flow in sheep fetuses subjected to total cord occlusion

2.50
Hdl Handle:
http://hdl.handle.net/2336/2835
Title:
Perinatal adaptive response of the adrenal and carotid blood flow in sheep fetuses subjected to total cord occlusion
Authors:
Hernandez-Andrade, Edgar; Hellström-Westas, Lena; Thorngren-Jerneck, Kristina; Jansson, Tomas; Liuba, Karina; Lingman, Göran; Marsál, Karel; Oskarsson, Gylfi; Werner, Olof; Ley, David
Citation:
J. Matern. Fetal. Neonatal. Med. 2005, 17(2):101-9
Issue Date:
1-Feb-2005
Abstract:
OBJECTIVE: To investigate the perinatal adaptive response of the adrenal blood flow/adrenal fractional moving blood volume (AFMBV) and carotid blood flow (CBF), in sheep fetuses subjected to severe acute intrauterine hypoxia/asphyxia induced by total cord occlusion. METHODS: Adrenal blood flow velocity, AFMBV and CBF were measured in 13 exteriorized fetal sheep; eight of them underwent total umbilical cord occlusion to induce severe acute hypoxia/asphyxia. Five lambs were used as sham controls. Middle adrenal artery pulsatility index (MAAPI) and mean velocity (MAAMV) were recorded with pulsed Doppler ultrasound. AFMBV was estimated using power Doppler ultrasound. CBF was recorded with a transonic flowmeter. In the neonatal period, after resuscitation all lambs were followed for a 4-hour period and AFMBV and CBF were recorded. Mean arterial blood pressure (MABP) and fetal heart rate were recorded continuously. Arterial cortisol levels were measured at the beginning and at the end of the fetal and neonatal periods. RESULTS: Following the total cord occlusion, there was a significant reduction in the CBF, MABP, and heart rate and adrenal flow/AFMBV after 2, 4 and 5 min, respectively. Cortisol levels in the asphyctic lambs at the end of the cord occlusion were significantly lower than those in controls. After resuscitation, the asphyctic lambs showed increased AFMBV and cortisol levels, and reduced MABP as compared to control lambs. No differences were found in CBF, MAAPI and MAAMV. Thereafter, no differences were observed between the two groups in any of the studied parameters. At the end of the cord occlusion period, there was a significant correlation between AFMBV and MABP (r=0.69), between AFMBV and CBF (r =0.65) and between CBF and MABP (r=0.89). CONCLUSION: During severe acute intrauterine hypoxia, the fetal lamb is able to maintain the blood flow to the brain and the adrenal gland for 3-5 min. Changes in the AFMBV and the CBF were highly correlated to the changes in MABP. Adrenal FMBV and cortisol levels were higher in lamb neonates exposed to severe intrauterine asphyxia.
Additional Links:
http://www.informaworld.com/10.1080/14767050500043509

Full metadata record

DC FieldValue Language
dc.contributor.authorHernandez-Andrade, Edgar-
dc.contributor.authorHellström-Westas, Lena-
dc.contributor.authorThorngren-Jerneck, Kristina-
dc.contributor.authorJansson, Tomas-
dc.contributor.authorLiuba, Karina-
dc.contributor.authorLingman, Göran-
dc.contributor.authorMarsál, Karel-
dc.contributor.authorOskarsson, Gylfi-
dc.contributor.authorWerner, Olof-
dc.contributor.authorLey, David-
dc.date.accessioned2006-05-18T13:21:23Z-
dc.date.available2006-05-18T13:21:23Z-
dc.date.issued2005-02-01-
dc.identifier.citationJ. Matern. Fetal. Neonatal. Med. 2005, 17(2):101-9en
dc.identifier.issn1476-7058-
dc.identifier.pmid16076616-
dc.identifier.doi10.1080/14767050500043509-
dc.identifier.urihttp://hdl.handle.net/2336/2835-
dc.description.abstractOBJECTIVE: To investigate the perinatal adaptive response of the adrenal blood flow/adrenal fractional moving blood volume (AFMBV) and carotid blood flow (CBF), in sheep fetuses subjected to severe acute intrauterine hypoxia/asphyxia induced by total cord occlusion. METHODS: Adrenal blood flow velocity, AFMBV and CBF were measured in 13 exteriorized fetal sheep; eight of them underwent total umbilical cord occlusion to induce severe acute hypoxia/asphyxia. Five lambs were used as sham controls. Middle adrenal artery pulsatility index (MAAPI) and mean velocity (MAAMV) were recorded with pulsed Doppler ultrasound. AFMBV was estimated using power Doppler ultrasound. CBF was recorded with a transonic flowmeter. In the neonatal period, after resuscitation all lambs were followed for a 4-hour period and AFMBV and CBF were recorded. Mean arterial blood pressure (MABP) and fetal heart rate were recorded continuously. Arterial cortisol levels were measured at the beginning and at the end of the fetal and neonatal periods. RESULTS: Following the total cord occlusion, there was a significant reduction in the CBF, MABP, and heart rate and adrenal flow/AFMBV after 2, 4 and 5 min, respectively. Cortisol levels in the asphyctic lambs at the end of the cord occlusion were significantly lower than those in controls. After resuscitation, the asphyctic lambs showed increased AFMBV and cortisol levels, and reduced MABP as compared to control lambs. No differences were found in CBF, MAAPI and MAAMV. Thereafter, no differences were observed between the two groups in any of the studied parameters. At the end of the cord occlusion period, there was a significant correlation between AFMBV and MABP (r=0.69), between AFMBV and CBF (r =0.65) and between CBF and MABP (r=0.89). CONCLUSION: During severe acute intrauterine hypoxia, the fetal lamb is able to maintain the blood flow to the brain and the adrenal gland for 3-5 min. Changes in the AFMBV and the CBF were highly correlated to the changes in MABP. Adrenal FMBV and cortisol levels were higher in lamb neonates exposed to severe intrauterine asphyxia.en
dc.language.isoenen
dc.publisherParthenon Pub. Groupen
dc.relation.urlhttp://www.informaworld.com/10.1080/14767050500043509-
dc.subjectAdrenal Glandsen
dc.subjectAnimalsen
dc.subjectBlood Flow Velocityen
dc.subjectCarotid Arteriesen
dc.subjectCerebrovascular Circulationen
dc.subjectFetal Hypoxiaen
dc.subjectFetusen
dc.subjectIschemiaen
dc.subjectUmbilical Corden
dc.titlePerinatal adaptive response of the adrenal and carotid blood flow in sheep fetuses subjected to total cord occlusionen
dc.typeArticleen
dc.identifier.journalJournal of maternal-fetal & neonatal medicineen
dc.format.digYES-

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