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An authentic animal model of the very preterm infant on nasal continuous positive airway pressure


Dargaville, PA and Lavizzari, A and Padoin, P and Black, D and Zonneveld, E and Perkins, E and Sourial, M and Rajapaksa, AE and Davis, PG and Hooper, SB and Moss, TJM and Polglase, GR and Tingay, DG, An authentic animal model of the very preterm infant on nasal continuous positive airway pressure, Intensive Care Medicine Experimental, 3, (1) Article 13. ISSN 2197-425X (2015) [Refereed Article]


Copyright Statement

2015 Dargaville et al.; licensee Springer. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0)

DOI: doi:10.1186/s40635-015-0051-4


BACKGROUND: The surge in uptake of nasal continuous positive airway pressure (CPAP) for respiratory support in preterm infants has occurred in the absence of an authentic animal model. Such a model would allow investigation of research questions of physiological and therapeutic importance. We therefore aimed to develop a preterm lamb model of the non-intubated very preterm infant on CPAP.

METHODS: After staged exteriorisation and instrumentation, preterm lambs were delivered from anaesthetised ewes at 131 to 133 days gestation. Via a single nasal prong (4-mm internal diameter, 6- to 7-cm depth), positive pressure was delivered from the outset, with nasal intermittent positive pressure ventilation (NIPPV) used until transition to nasal CPAP was attempted, and periodically thereafter for hypoventilation. Caffeine and doxapram were used as respiratory stimulants. Gastric distension was prevented with an oesophageal balloon. Cardiorespiratory parameters and results of arterial blood gas analyses were monitored throughout the study period, which continued for 150 min after first transition to CPAP.

RESULTS: Ten preterm lambs were studied, at gestation 132  1 days (mean  SD) and birth weight 3.6  0.45 kg. After stabilisation on NIPPV, transition to nasal CPAP was first attempted at 28  11 min. There was transient respiratory acidosis, with gradual resolution as spontaneous respiratory activity increased. In the final hour, 79%  33% of time was spent on CPAP alone, with typical respiratory rates around 60 breaths per minute. PaCO2 at end-experiment was 58  36 mmHg.

CONCLUSIONS: Non-intubated preterm lambs can be effectively transitioned to nasal CPAP soon after birth. This animal model will be valuable for further research.

Item Details

Item Type:Refereed Article
Keywords:Preterm lamb, Continuous positive airway pressure, Non-invasive positive pressure ventilation, Apnoea
Research Division:Biomedical and Clinical Sciences
Research Group:Paediatrics
Research Field:Paediatrics not elsewhere classified
Objective Division:Health
Objective Group:Specific population health (excl. Indigenous health)
Objective Field:Neonatal and child health
UTAS Author:Dargaville, PA (Professor Peter Dargaville)
ID Code:117185
Year Published:2015
Deposited By:Menzies Institute for Medical Research
Deposited On:2017-06-01
Last Modified:2017-11-03
Downloads:118 View Download Statistics

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