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Ventilation-to-perfusion relationships and right-to-left shunt during neonatal intensive care in infants with congenital diaphragmatic hernia

Research output: Contribution to journalArticlepeer-review

Theodore Dassios, Fahad M. Shareef Arattu Thodika, Emma Williams, Mark Davenport, Kypros H. Nicolaides, Anne Greenough

Original languageEnglish
JournalPediatric Research
DOIs
Accepted/In press2022

Bibliographical note

Funding Information: E.W. was supported by a grant from the Charles Wolfson Charitable Trust and a non-conditional educational grant from SLE. The research was supported by the National Institute for Health Research (NIHR) Biomedical Research Centre based at Guy’s and St Thomas’ NHS Foundation Trust and King’s College London. The views expressed are those of the author(s) and not necessarily those of the NHS, the NIHR or the Department of Health. Publisher Copyright: © 2022, The Author(s).

King's Authors

Abstract

Background: We aimed to explore the postnatal evolution of ventilation/perfusion ratio (VA/Q) and right-to-left shunt in infants with congenital diaphragmatic hernia (CDH) and whether these indices predicted survival to discharge. Methods: Retrospective cohort study at King’s College Hospital, London, UK of infants admitted with CDH in 10 years (2011–2021). The non-invasive method of the oxyhaemoglobin dissociation curve was used to determine the VA/Q and shunt in the first 24 h of life, pre-operation, pre-extubation and in the deceased infants, before death. Results: Eighty-two infants with CDH (71 left-sided) were included with a median (IQR) gestation of 38.1(34.8–39.0) weeks. Fifty-three (65%) survived to discharge from neonatal care. The median (IQR) VA/Q in the first 24 h was lower in the deceased infants [0.09(0.07–0.12)] compared to the ones who survived [0.28(0.19–0.38), p < 0.001]. In the infants who survived, the VA/Q was lower in the first 24 h [0.28 (0.19–0.38)] compared to pre-operation [0.41 (0.3–0.49), p < 0.001] and lower pre-operation compared to pre-extubation [0.48 (0.39–0.55), p = 0.027]. The shunt was not different in infants who survived compared to the infants who did not. Conclusions: Ventilation-to-perfusion ratio was lower in infants who died in the neonatal period compared to the ones that survived and improved in surviving infants over the immediate postnatal period. Impact: The non-invasive method of the oxyhaemoglobin dissociation curve was used to determine the ventilation/perfusion ratio VA/Q in infants with congenital diaphragmatic hernia (CDH) in the first 24 h of life, pre-operation, pre-extubation and in the deceased infants, before death.The VA/Q in the first 24 h of life was lower in the infants who did not survive to discharge from neonatal care compared to the ones who survived.In the infants who survived, the VA/Q improved over the immediate postnatal period.The non-invasive calculation of VA/Q can provide valuable information relating to survival to discharge.

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