Timely repetitive antenatal steroids (AS) vs. single course AS

Effect on functional residual capacity (FRC) and respiratory compliance (CRS) in preterm infants

Cynthia (Cindy) McEvoy, S. Bowling, B. Sontag, M. Stewart

Research output: Contribution to journalArticle

Abstract

AS enhance lung function in the scenario of preterm delivery. Gravidas who remain undelivered after initial therapy with betamethasone (BMZ) (two 12mg doses), are often repetitively dosed at 7 day intervals untill delivery. The efficacy of repetitive dosing (REP) with AS is unknown. To evaluate the effect of REP dosing on lung volume and pulmonary mechanics, we measured FRC and Crs within the first 24 hours of life in preterm Infants 25 to 34 weeks of gestation. 24 infants (mean BW=1686g, GA 31.0 wks, 54% male, 8% treated with surfactant(S)) received REP AS (2 or more courses of BMZ with delivery within 14 days of the last dose). 31 infants (mean BW=1602g, GA=30.7 wks, 32% male, 6% treated with S) received a single course (SC) of AS (2 doses BMZ with the first at least 24 hours prior to delivery and the last within 7 days of delivery). 24 control infants (mean BW=1596g, GA=30.9 wks, 50% male, 54% treated with S) received no AS. FRC was measured with the nitrogen washout technique within 24 hours of age, and prior to surfactant therapy if required. A minimum of two measurements were performed with the neonate supine and quiet. Only consistent tracings initiated at end expiration and without evidence of a leak were accepted. A study was acceptable only if the measurements had a coefficient of variation less than 10%. Crs was measured using the single breath occlusion technique (Sensormedics 2600). FRC and Crs are shown as M±SEM. REP AS SC AS NO AS FRC (cc/Kg) 28.0±1.4 * 28.2±1.2 * 18.8±1.6 Crs (ml/cmH2O/kg) 1.24±0.11 1 1.15±0.09 1 0.84±0.19 * p=

Original languageEnglish (US)
JournalJournal of Investigative Medicine
Volume44
Issue number1
StatePublished - 1996
Externally publishedYes

Fingerprint

Functional Residual Capacity
Premature Infants
Compliance
Steroids
Surface-Active Agents
Lung
Betamethasone
Mechanics
Nitrogen
Newborn Infant
Pregnancy
Therapeutics

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)

Cite this

@article{50396f9e473d442fb031a5f65e4dfdd0,
title = "Timely repetitive antenatal steroids (AS) vs. single course AS: Effect on functional residual capacity (FRC) and respiratory compliance (CRS) in preterm infants",
abstract = "AS enhance lung function in the scenario of preterm delivery. Gravidas who remain undelivered after initial therapy with betamethasone (BMZ) (two 12mg doses), are often repetitively dosed at 7 day intervals untill delivery. The efficacy of repetitive dosing (REP) with AS is unknown. To evaluate the effect of REP dosing on lung volume and pulmonary mechanics, we measured FRC and Crs within the first 24 hours of life in preterm Infants 25 to 34 weeks of gestation. 24 infants (mean BW=1686g, GA 31.0 wks, 54{\%} male, 8{\%} treated with surfactant(S)) received REP AS (2 or more courses of BMZ with delivery within 14 days of the last dose). 31 infants (mean BW=1602g, GA=30.7 wks, 32{\%} male, 6{\%} treated with S) received a single course (SC) of AS (2 doses BMZ with the first at least 24 hours prior to delivery and the last within 7 days of delivery). 24 control infants (mean BW=1596g, GA=30.9 wks, 50{\%} male, 54{\%} treated with S) received no AS. FRC was measured with the nitrogen washout technique within 24 hours of age, and prior to surfactant therapy if required. A minimum of two measurements were performed with the neonate supine and quiet. Only consistent tracings initiated at end expiration and without evidence of a leak were accepted. A study was acceptable only if the measurements had a coefficient of variation less than 10{\%}. Crs was measured using the single breath occlusion technique (Sensormedics 2600). FRC and Crs are shown as M±SEM. REP AS SC AS NO AS FRC (cc/Kg) 28.0±1.4 * 28.2±1.2 * 18.8±1.6 Crs (ml/cmH2O/kg) 1.24±0.11 1 1.15±0.09 1 0.84±0.19 * p=",
author = "McEvoy, {Cynthia (Cindy)} and S. Bowling and B. Sontag and M. Stewart",
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T1 - Timely repetitive antenatal steroids (AS) vs. single course AS

T2 - Effect on functional residual capacity (FRC) and respiratory compliance (CRS) in preterm infants

AU - McEvoy, Cynthia (Cindy)

AU - Bowling, S.

AU - Sontag, B.

AU - Stewart, M.

PY - 1996

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AB - AS enhance lung function in the scenario of preterm delivery. Gravidas who remain undelivered after initial therapy with betamethasone (BMZ) (two 12mg doses), are often repetitively dosed at 7 day intervals untill delivery. The efficacy of repetitive dosing (REP) with AS is unknown. To evaluate the effect of REP dosing on lung volume and pulmonary mechanics, we measured FRC and Crs within the first 24 hours of life in preterm Infants 25 to 34 weeks of gestation. 24 infants (mean BW=1686g, GA 31.0 wks, 54% male, 8% treated with surfactant(S)) received REP AS (2 or more courses of BMZ with delivery within 14 days of the last dose). 31 infants (mean BW=1602g, GA=30.7 wks, 32% male, 6% treated with S) received a single course (SC) of AS (2 doses BMZ with the first at least 24 hours prior to delivery and the last within 7 days of delivery). 24 control infants (mean BW=1596g, GA=30.9 wks, 50% male, 54% treated with S) received no AS. FRC was measured with the nitrogen washout technique within 24 hours of age, and prior to surfactant therapy if required. A minimum of two measurements were performed with the neonate supine and quiet. Only consistent tracings initiated at end expiration and without evidence of a leak were accepted. A study was acceptable only if the measurements had a coefficient of variation less than 10%. Crs was measured using the single breath occlusion technique (Sensormedics 2600). FRC and Crs are shown as M±SEM. REP AS SC AS NO AS FRC (cc/Kg) 28.0±1.4 * 28.2±1.2 * 18.8±1.6 Crs (ml/cmH2O/kg) 1.24±0.11 1 1.15±0.09 1 0.84±0.19 * p=

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