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Research: SEASONAL VARIATION OF CONGENITAL DIAPHRAGMATIC HERNIA: A REVIEW OF THE LITERATURE AND DATABASE REPORT FROM USA AND CANADA

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Research: SEASONAL VARIATION OF CONGENITAL DIAPHRAGMATIC HERNIA: A REVIEW OF THE LITERATURE AND DATABASE REPORT FROM USA AND CANADA

Eur J Pediatr Surg

. 2022 Jul 20.

 doi: 10.1055/a-1905-4808. Online ahead of print. https://pubmed.ncbi.nlm.nih.gov/35858641/

SEASONAL VARIATION OF CONGENITAL DIAPHRAGMATIC HERNIA: A REVIEW OF THE LITERATURE AND DATABASE REPORT FROM USA AND CANADA

Fabian Doktor 1 2Lina Antounians 1 2Jason Miller 3Maria Harb 3Tracy Meats 3Rachel Bercovitch 1 2Dawn Ireland 3Augusto Zani 1 2 4

Affiliations expand

Abstract

Introduction: The etiology of congenital diaphragmatic hernia (CDH) remains unknown and only 10-30% of patients have a genetic cause. Seasonal variation is known to contribute to the development of some congenital anomalies. Our aim was to investigate whether CDH births have seasonal variation.

Material and methods: A literature review was conducted for CDH and seasonality. Moreover, data from the CDH International Patient Registry Database were collected for babies with due dates between 2008 and 2014. Due dates were used to determine seasonal distribution of births. Birth rates per month in USA and Canada were extracted from publicly available databases. Data were analyzed using ANOVA and contingency tables.

Results: Firstly, the literature review revealed 11 articles, of which 3 were eligible for inclusion. These studies reported conflicting results on seasonality of CDH. Secondly, we extracted due dates from the CDH International Patient Registry Database (1,259 patients) and found that there were fewer due dates in winter months (12.1±4 patients/month) than in summer (16.7±6 patients/month; p=0.011) and fall months (16.3±5 patients/month; p=0.022). Although this trend was similar to that of all births in USA and Canada, a lower incidence was observed in winter for CDH babies (20.2%) than for the general population (24.1%, p= 0.0012). CDH survival rate did not vary by season.

Conclusions: This study provides evidence for a seasonal variation of CDH births. No causative link was established between CDH development and seasonality. Population-based studies with a focus on exposome data are needed to explain seasonal variation in CDH.

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