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Pediatric Surgery International

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01-02-2011 | Original Article

Late administration of antenatal vitamin A promotes pulmonary structural maturation and improves ventilation in the lamb model of congenital diaphragmatic hernia

Authors: Nicola A. Lewis, Bruce A. Holm, Jon Rossman, Daniel Swartz, Philip L. Glick

Published in: Pediatric Surgery International | Issue 2/2011

Abstract

Purpose

The lungs in congenital diaphragmatic hernia (CDH) are hypoplastic and immature making respiratory support one of the most challenging aspects of caring for these neonates. Vitamin A is essential for normal lung growth and development. It also promotes alveolarization. The aim of this study is to investigate the effects of antenatal vitamin A on lung growth and alveolarization and ventilation in the lamb model of CDH.

Methods

This study was approved by the Animal Care Committee of the State University of New York at Buffalo, and conforms to the National Institute of Health guidelines. Diaphragmatic defects were created at 79–81 days gestation. Group 1 lambs (CDH, n = 5) were untreated. In group 2 (CDH + vitamin A, n = 6) and group 3 lambs (control + vitamin A, n = 3) right jugular venous catheters were inserted at 118–120 days and retinyl palmitate (vitamin A) was administered until 135 days. The control group (n = 5) consisted of twin littermates. Lambs were delivered at 136–139 days and ventilated for 2 h according to a set protocol. The left lungs were harvested and fixed for histology.

Results

Lung compliance was significantly higher in CDH + vitamin A (median 0.27, range 0.1–0.48 ml/cmH₂O/kg) versus CDH lambs (median 0.07, range 0.07–0.18 ml/cmH₂O/kg), P < 0.05. At 1 h CDH + vitamin A lambs experienced significantly lower PaCO₂ (median 115, range 35–194 mmHg vs. median 192, range 168–234 mmHg) and higher arterial pH (median 7.0, range 6.74–7.35 vs. median 6.73, range 6.5–6.81) than CDH lambs, P < 0.05. The lung weight to body weight ratio of CDH + vitamin A lambs was significantly less than that of CDH lambs (P < 0.05). Histology showed small thick walled air-spaces and no true alveoli in CDH lambs. In contrast, true alveoli and thinning of the inter-alveolar septums were seen in CDH + vitamin A lambs.

Conclusion

This is the first study to demonstrate an improvement in lung function and structural maturation when antenatal vitamin A is given in a surgical model of CDH.

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Title: Late administration of antenatal vitamin A promotes pulmonary structural maturation and improves ventilation in the lamb model of congenital diaphragmatic hernia
Authors: Nicola A. Lewis
Bruce A. Holm
Jon Rossman
Daniel Swartz
Philip L. Glick
Publication date: 01-02-2011
Publisher: Springer-Verlag
Published in: Pediatric Surgery International / Issue 2/2011
Print ISSN: 0179-0358
Electronic ISSN: 1437-9813
DOI: https://doi.org/10.1007/s00383-010-2790-3

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Late administration of antenatal vitamin A promotes pulmonary structural maturation and improves ventilation in the lamb model of congenital diaphragmatic hernia

Abstract

Purpose

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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