Pulmonary arterial contractility in neonatal lambs increases with 100% oxygen resuscitation

Satyanarayana Lakshminrusimha, James A. Russell, Robin H Steinhorn, Rita M. Ryan, Sylvia F. Gugino, Frederick C. Morin, Daniel D. Swartz, Vasanth H. Kumar

Research output: Contribution to journalArticle

88 Citations (Scopus)

Abstract

The optimal FiO2 during neonatal resuscitation is a subject of controversy. The effect of exposure to high levels of inspired oxygen on pulmonary arterial (PA) contractility is not known. We studied differences in PA vasoreactivity in term lambs initially ventilated with 21% or 100% oxygen, followed by continued ventilation using oxygen as needed for 24 h, or ventilated with 100% oxygen for 24 h and room air breathing 1-d-old lambs. Term lambs were delivered by cesarean section, intubated, and ventilated with 21% (21%Res) or 100% oxygen (100%Res) for the first 30 min of life. Subsequently, the ventilator FiO2 was adjusted to maintain a Pao2 between 45 and 65 mm Hg for 24 h. Five lambs were ventilated continuously with 100% oxygen (100%24h). Six spontaneously breathing newborn lambs (RA Spont) were studied for comparison. Lambs were killed at 24 h of life and PA rings were isolated and contracted with norepinephrine (NE) and KCl and some were relaxed with A23187 and SNAP in tissue baths. NE and KCl induced contractions were highest in PA isolated from 100%24h lambs, and were significantly higher in 100%Res lambs than PA from 21%Res lambs. Contraction responses in PA from RA Spont lambs were similar to 21%Res lambs. Relaxations to A23187 and SNAP were similar among all ventilated groups. PA contractility to NE and KCl is increased following both brief (30 min) and prolonged (24 h) exposure to 100% oxygen during mechanical ventilation. In contrast, normoxic resuscitation and ventilation do not increase PA contractility.

Original languageEnglish (US)
Pages (from-to)137-141
Number of pages5
JournalPediatric Research
Volume59
Issue number1
DOIs
StatePublished - Jan 2006
Externally publishedYes

Fingerprint

Resuscitation
Oxygen
Lung
Norepinephrine
Calcimycin
Ventilation
Respiration
Mechanical Ventilators
Baths
Artificial Respiration
Cesarean Section
Air

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

Cite this

Lakshminrusimha, S., Russell, J. A., Steinhorn, R. H., Ryan, R. M., Gugino, S. F., Morin, F. C., ... Kumar, V. H. (2006). Pulmonary arterial contractility in neonatal lambs increases with 100% oxygen resuscitation. Pediatric Research, 59(1), 137-141. https://doi.org/10.1203/01.pdr.0000191136.69142.8c

Pulmonary arterial contractility in neonatal lambs increases with 100% oxygen resuscitation. / Lakshminrusimha, Satyanarayana; Russell, James A.; Steinhorn, Robin H; Ryan, Rita M.; Gugino, Sylvia F.; Morin, Frederick C.; Swartz, Daniel D.; Kumar, Vasanth H.

In: Pediatric Research, Vol. 59, No. 1, 01.2006, p. 137-141.

Research output: Contribution to journalArticle

Lakshminrusimha, S, Russell, JA, Steinhorn, RH, Ryan, RM, Gugino, SF, Morin, FC, Swartz, DD & Kumar, VH 2006, 'Pulmonary arterial contractility in neonatal lambs increases with 100% oxygen resuscitation', Pediatric Research, vol. 59, no. 1, pp. 137-141. https://doi.org/10.1203/01.pdr.0000191136.69142.8c
Lakshminrusimha, Satyanarayana ; Russell, James A. ; Steinhorn, Robin H ; Ryan, Rita M. ; Gugino, Sylvia F. ; Morin, Frederick C. ; Swartz, Daniel D. ; Kumar, Vasanth H. / Pulmonary arterial contractility in neonatal lambs increases with 100% oxygen resuscitation. In: Pediatric Research. 2006 ; Vol. 59, No. 1. pp. 137-141.
@article{933247aea6554c9d8c9da5c110646d68,
title = "Pulmonary arterial contractility in neonatal lambs increases with 100{\%} oxygen resuscitation",
abstract = "The optimal FiO2 during neonatal resuscitation is a subject of controversy. The effect of exposure to high levels of inspired oxygen on pulmonary arterial (PA) contractility is not known. We studied differences in PA vasoreactivity in term lambs initially ventilated with 21{\%} or 100{\%} oxygen, followed by continued ventilation using oxygen as needed for 24 h, or ventilated with 100{\%} oxygen for 24 h and room air breathing 1-d-old lambs. Term lambs were delivered by cesarean section, intubated, and ventilated with 21{\%} (21{\%}Res) or 100{\%} oxygen (100{\%}Res) for the first 30 min of life. Subsequently, the ventilator FiO2 was adjusted to maintain a Pao2 between 45 and 65 mm Hg for 24 h. Five lambs were ventilated continuously with 100{\%} oxygen (100{\%}24h). Six spontaneously breathing newborn lambs (RA Spont) were studied for comparison. Lambs were killed at 24 h of life and PA rings were isolated and contracted with norepinephrine (NE) and KCl and some were relaxed with A23187 and SNAP in tissue baths. NE and KCl induced contractions were highest in PA isolated from 100{\%}24h lambs, and were significantly higher in 100{\%}Res lambs than PA from 21{\%}Res lambs. Contraction responses in PA from RA Spont lambs were similar to 21{\%}Res lambs. Relaxations to A23187 and SNAP were similar among all ventilated groups. PA contractility to NE and KCl is increased following both brief (30 min) and prolonged (24 h) exposure to 100{\%} oxygen during mechanical ventilation. In contrast, normoxic resuscitation and ventilation do not increase PA contractility.",
author = "Satyanarayana Lakshminrusimha and Russell, {James A.} and Steinhorn, {Robin H} and Ryan, {Rita M.} and Gugino, {Sylvia F.} and Morin, {Frederick C.} and Swartz, {Daniel D.} and Kumar, {Vasanth H.}",
year = "2006",
month = "1",
doi = "10.1203/01.pdr.0000191136.69142.8c",
language = "English (US)",
volume = "59",
pages = "137--141",
journal = "Pediatric Research",
issn = "0031-3998",
publisher = "Lippincott Williams and Wilkins",
number = "1",

}

TY - JOUR

T1 - Pulmonary arterial contractility in neonatal lambs increases with 100% oxygen resuscitation

AU - Lakshminrusimha, Satyanarayana

AU - Russell, James A.

AU - Steinhorn, Robin H

AU - Ryan, Rita M.

AU - Gugino, Sylvia F.

AU - Morin, Frederick C.

AU - Swartz, Daniel D.

AU - Kumar, Vasanth H.

PY - 2006/1

Y1 - 2006/1

N2 - The optimal FiO2 during neonatal resuscitation is a subject of controversy. The effect of exposure to high levels of inspired oxygen on pulmonary arterial (PA) contractility is not known. We studied differences in PA vasoreactivity in term lambs initially ventilated with 21% or 100% oxygen, followed by continued ventilation using oxygen as needed for 24 h, or ventilated with 100% oxygen for 24 h and room air breathing 1-d-old lambs. Term lambs were delivered by cesarean section, intubated, and ventilated with 21% (21%Res) or 100% oxygen (100%Res) for the first 30 min of life. Subsequently, the ventilator FiO2 was adjusted to maintain a Pao2 between 45 and 65 mm Hg for 24 h. Five lambs were ventilated continuously with 100% oxygen (100%24h). Six spontaneously breathing newborn lambs (RA Spont) were studied for comparison. Lambs were killed at 24 h of life and PA rings were isolated and contracted with norepinephrine (NE) and KCl and some were relaxed with A23187 and SNAP in tissue baths. NE and KCl induced contractions were highest in PA isolated from 100%24h lambs, and were significantly higher in 100%Res lambs than PA from 21%Res lambs. Contraction responses in PA from RA Spont lambs were similar to 21%Res lambs. Relaxations to A23187 and SNAP were similar among all ventilated groups. PA contractility to NE and KCl is increased following both brief (30 min) and prolonged (24 h) exposure to 100% oxygen during mechanical ventilation. In contrast, normoxic resuscitation and ventilation do not increase PA contractility.

AB - The optimal FiO2 during neonatal resuscitation is a subject of controversy. The effect of exposure to high levels of inspired oxygen on pulmonary arterial (PA) contractility is not known. We studied differences in PA vasoreactivity in term lambs initially ventilated with 21% or 100% oxygen, followed by continued ventilation using oxygen as needed for 24 h, or ventilated with 100% oxygen for 24 h and room air breathing 1-d-old lambs. Term lambs were delivered by cesarean section, intubated, and ventilated with 21% (21%Res) or 100% oxygen (100%Res) for the first 30 min of life. Subsequently, the ventilator FiO2 was adjusted to maintain a Pao2 between 45 and 65 mm Hg for 24 h. Five lambs were ventilated continuously with 100% oxygen (100%24h). Six spontaneously breathing newborn lambs (RA Spont) were studied for comparison. Lambs were killed at 24 h of life and PA rings were isolated and contracted with norepinephrine (NE) and KCl and some were relaxed with A23187 and SNAP in tissue baths. NE and KCl induced contractions were highest in PA isolated from 100%24h lambs, and were significantly higher in 100%Res lambs than PA from 21%Res lambs. Contraction responses in PA from RA Spont lambs were similar to 21%Res lambs. Relaxations to A23187 and SNAP were similar among all ventilated groups. PA contractility to NE and KCl is increased following both brief (30 min) and prolonged (24 h) exposure to 100% oxygen during mechanical ventilation. In contrast, normoxic resuscitation and ventilation do not increase PA contractility.

UR - http://www.scopus.com/inward/record.url?scp=33644820808&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33644820808&partnerID=8YFLogxK

U2 - 10.1203/01.pdr.0000191136.69142.8c

DO - 10.1203/01.pdr.0000191136.69142.8c

M3 - Article

C2 - 16326983

AN - SCOPUS:33644820808

VL - 59

SP - 137

EP - 141

JO - Pediatric Research

JF - Pediatric Research

SN - 0031-3998

IS - 1

ER -