An initial sustained inflation improves the respiratory and cardiovascular transition at birth in preterm lambs

Kristina Sobotka, Stuart Hooper, Beth Allison, Arjan B Te Pas, Peter Davis, Colin J Morley, Timothy Moss

Research output: Contribution to journalArticleResearchpeer-review

Abstract

A sustained inflation (SI) facilitates lung aeration after birth but may impair the neonatal cardiovascular transition. We aimed to determine the effect of an initial SI on pulmonary arterial and carotid blood flow (PBF and CBF) after preterm birth. Fetal sheep were instrumented at approximately 122 d of gestation (d). Lambs were delivered at approximately 127 d and received either an initial SI (40 cm H2O for 1 min or until a volume of 20 mL/kg was administered) followed by ventilation for 30 min (SI; n = 7) or ventilation for 30 min (non-SI; n = 6). At 10 min after ventilation onset, inspired O2 content increased from 21 to 100 for 10 min. PBF, CBF, pulmonary arterial and carotid pressures, tidal volume, and inspiratory pressures were recorded. PBF was greater during the SI (p <0.05) but thereafter was similar between groups. Non-SI lambs were hypoxemic and had higher CBF than SI lambs (p <0.05). Cerebral oxygen delivery was constant in SI lambs but increased approximately 4-fold in non-SI lambs during ventilation with 100 O2 (p <0.05). Lung compliance and respiratory status were better in SI than non-SI lambs (p <0.05). A SI improved lung function without adverse circulatory effects, seemed to stabilize neonatal cerebral O2 delivery, and may protect against cerebral hyperoxia.
Original languageEnglish
Pages (from-to)56 - 60
Number of pages5
JournalPediatric Research
Volume70
Issue number1
DOIs
Publication statusPublished - 2011

Cite this

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title = "An initial sustained inflation improves the respiratory and cardiovascular transition at birth in preterm lambs",
abstract = "A sustained inflation (SI) facilitates lung aeration after birth but may impair the neonatal cardiovascular transition. We aimed to determine the effect of an initial SI on pulmonary arterial and carotid blood flow (PBF and CBF) after preterm birth. Fetal sheep were instrumented at approximately 122 d of gestation (d). Lambs were delivered at approximately 127 d and received either an initial SI (40 cm H2O for 1 min or until a volume of 20 mL/kg was administered) followed by ventilation for 30 min (SI; n = 7) or ventilation for 30 min (non-SI; n = 6). At 10 min after ventilation onset, inspired O2 content increased from 21 to 100 for 10 min. PBF, CBF, pulmonary arterial and carotid pressures, tidal volume, and inspiratory pressures were recorded. PBF was greater during the SI (p <0.05) but thereafter was similar between groups. Non-SI lambs were hypoxemic and had higher CBF than SI lambs (p <0.05). Cerebral oxygen delivery was constant in SI lambs but increased approximately 4-fold in non-SI lambs during ventilation with 100 O2 (p <0.05). Lung compliance and respiratory status were better in SI than non-SI lambs (p <0.05). A SI improved lung function without adverse circulatory effects, seemed to stabilize neonatal cerebral O2 delivery, and may protect against cerebral hyperoxia.",
author = "Kristina Sobotka and Stuart Hooper and Beth Allison and {Te Pas}, {Arjan B} and Peter Davis and Morley, {Colin J} and Timothy Moss",
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pages = "56 -- 60",
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An initial sustained inflation improves the respiratory and cardiovascular transition at birth in preterm lambs. / Sobotka, Kristina; Hooper, Stuart; Allison, Beth; Te Pas, Arjan B; Davis, Peter; Morley, Colin J; Moss, Timothy.

In: Pediatric Research, Vol. 70, No. 1, 2011, p. 56 - 60.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - An initial sustained inflation improves the respiratory and cardiovascular transition at birth in preterm lambs

AU - Sobotka, Kristina

AU - Hooper, Stuart

AU - Allison, Beth

AU - Te Pas, Arjan B

AU - Davis, Peter

AU - Morley, Colin J

AU - Moss, Timothy

PY - 2011

Y1 - 2011

N2 - A sustained inflation (SI) facilitates lung aeration after birth but may impair the neonatal cardiovascular transition. We aimed to determine the effect of an initial SI on pulmonary arterial and carotid blood flow (PBF and CBF) after preterm birth. Fetal sheep were instrumented at approximately 122 d of gestation (d). Lambs were delivered at approximately 127 d and received either an initial SI (40 cm H2O for 1 min or until a volume of 20 mL/kg was administered) followed by ventilation for 30 min (SI; n = 7) or ventilation for 30 min (non-SI; n = 6). At 10 min after ventilation onset, inspired O2 content increased from 21 to 100 for 10 min. PBF, CBF, pulmonary arterial and carotid pressures, tidal volume, and inspiratory pressures were recorded. PBF was greater during the SI (p <0.05) but thereafter was similar between groups. Non-SI lambs were hypoxemic and had higher CBF than SI lambs (p <0.05). Cerebral oxygen delivery was constant in SI lambs but increased approximately 4-fold in non-SI lambs during ventilation with 100 O2 (p <0.05). Lung compliance and respiratory status were better in SI than non-SI lambs (p <0.05). A SI improved lung function without adverse circulatory effects, seemed to stabilize neonatal cerebral O2 delivery, and may protect against cerebral hyperoxia.

AB - A sustained inflation (SI) facilitates lung aeration after birth but may impair the neonatal cardiovascular transition. We aimed to determine the effect of an initial SI on pulmonary arterial and carotid blood flow (PBF and CBF) after preterm birth. Fetal sheep were instrumented at approximately 122 d of gestation (d). Lambs were delivered at approximately 127 d and received either an initial SI (40 cm H2O for 1 min or until a volume of 20 mL/kg was administered) followed by ventilation for 30 min (SI; n = 7) or ventilation for 30 min (non-SI; n = 6). At 10 min after ventilation onset, inspired O2 content increased from 21 to 100 for 10 min. PBF, CBF, pulmonary arterial and carotid pressures, tidal volume, and inspiratory pressures were recorded. PBF was greater during the SI (p <0.05) but thereafter was similar between groups. Non-SI lambs were hypoxemic and had higher CBF than SI lambs (p <0.05). Cerebral oxygen delivery was constant in SI lambs but increased approximately 4-fold in non-SI lambs during ventilation with 100 O2 (p <0.05). Lung compliance and respiratory status were better in SI than non-SI lambs (p <0.05). A SI improved lung function without adverse circulatory effects, seemed to stabilize neonatal cerebral O2 delivery, and may protect against cerebral hyperoxia.

UR - http://www.ncbi.nlm.nih.gov/pubmed/21659961

U2 - 10.1203/PDR.0b013e31821d06a1

DO - 10.1203/PDR.0b013e31821d06a1

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