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Research: Respiratory function after birth in infants with congenital diaphragmatic hernia

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Research: Respiratory function after birth in infants with congenital diaphragmatic hernia

. 2022 Nov 18;fetalneonatal-2022-324415.

 doi: 10.1136/archdischild-2022-324415. Online ahead of print. https://pubmed.ncbi.nlm.nih.gov/36400455/

Respiratory function after birth in infants with congenital diaphragmatic hernia

K Taylor Wild 1Leny Mathew 2Holly L Hedrick 3 4Natalie E Rintoul 5 4Anne Ades 5 4Leane Soorikian 5Kelle Matthews 5Michael A Posencheg 5 4Erin Kesler 3K Taylor Van Hoose 3Howard B Panitch 4 6John Flibotte 5 4Elizabeth E Foglia 5 4

Affiliations expand

Abstract

Objective: To characterise the transitional pulmonary physiology of infants with congenital diaphragmatic hernia (CDH) using measures of expiratory tidal volume (TV) and end-tidal carbon dioxide (ETCO2).

Design: Prospective single-centre observational study.

Setting: Quaternary neonatal intensive care unit.

Patients: Infants with an antenatal diagnosis of CDH born at the Children’s Hospital of Philadelphia.

Interventions: TV and ETCO2 were simultaneously recorded using a respiratory function monitor (RFM) during invasive positive pressure ventilation immediately after birth.

Main outcome measures: TV per birth weight and ETCO2 values were summarised for each minute after birth. Subgroups of interest were defined by liver position (thoracic vs abdominal) and extracorporeal membrane oxygenation (ECMO) treatment.

Results: RFM data were available for 50 infants from intubation until a median (IQR) of 9 (7-14) min after birth. TV and ETCO2 values increased for the first 10 min after birth, but intersubject values were heterogeneous. TVs were overall lower and ETCO2 values higher in infants with an intrathoracic liver and infants who were ultimately treated with ECMO. On hospital discharge, survival was 88% (n=43) and 34% (n=17) of infants were treated with ECMO.

Conclusion: Respiratory function immediately after birth is heterogeneous for infants with CDH. Lung aeration, as evidenced by expired TV and ETCO2, appears to be ongoing throughout the first 10 min after birth during invasive positive pressure ventilation. Close attention to expired TV and ETCO2 levels by 10 min after birth may provide an opportunity to optimise and individualise ventilatory support for this high-risk population.

Keywords: neonatology; resuscitation.

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