BACKGROUND: Pyloric stenosis is a relatively common paediatric surgical condition, but a worldwide decline in its incidence has been observed in recent decades. The objective of this study was to identify if the incidence of Pyloric stenosis in New Zealand has been declining. METHODS: A retrospective review of the four New Zealand paediatric surgical centres' theatre databases from 2007 to 2017. Demographic data were recorded for all infants who had a pyloromyotomy and annual incidences of Pyloric stenosis calculated. RESULTS: A total of 393 infants underwent a pyloromyotomy for Pyloric stenosis during the study period. Most infants (81%) were of European ethnicity. There was a significant decline (P = 0.0001) in the national incidence of Pyloric stenosis from 0.73/1000 live births (LB) in 2007 to 0.39/1000 LB in 2017. From 2007 to 2017, the incidence of male infants with Pyloric stenosis declined from 1.27/1000 LB to 0.62/1000 LB. The current annual incidence of Pyloric stenosis in New Zealand is 0.39/1000 LB. CONCLUSIONS: The incidence of Pyloric stenosis in New Zealand has significantly declined in the last decade and is currently the lowest reported incidence in the world involving a predominantly European cohort. A decline in male infants developing Pyloric stenosis was also observed. Further study is required to investigate causes for this low incidence and declining trend.
Pedersen RN, Garne E, Loane M, Korsholm L, Husby S, A Eurocat Working Group. Infantile hypertrophic pyloric stenosis: a comparative study of incidence and other epidemiological characteristics in seven European regions. J. Matern. Fetal Neonatal Med. 2008; 21: 599-604.
Zhu J, Zhu T, Lin Z, Qu Y, Mu D. Perinatal risk factors for infantile hypertrophic pyloric stenosis: a meta-analysis. J. Pediatr. Surg. 2017; 52: 1389-97.
Markel TA, Proctor C, Ying J, Winchester PD. Environmental pesticides increase the risk of developing hypertrophic pyloric stenosis. J. Pediatr. Surg. 2015; 50: 1283-8.
de Laffolie J, Turial S, Heckmann M, Zimmer K-P, Schier F. Decline in infantile hypertrophic pyloric stenosis in Germany in 2000-2008. Pediatrics 2012; 129: e901-6.
Sommerfield T, Chalmers J, Youngson G, Heeley C, Fleming M, Thomson G. The changing epidemiology of infantile hypertrophic pyloric stenosis in Scotland. Arch. Dis. Child. 2008; 93: 1007-11.
Leong MM, ChenSolomon SCC, Hsieh CS et al. Epidemiological features of infantile hypertrophic pyloric stenosis in Taiwanese children: a nation-wide analysis of cases during 1997-2007. PLoS One 2011; 6: e19404.
Schechter R, Torfs CP, Bateson TF. The epidemiology of infantile hypertrophic pyloric stenosis. Paediatr. Perinat. Epidemiol. 1997; 11: 407-27.
Persson S, Ekbom A, Granath F, Nordenskjöld A, Schier F. Parallel incidences of sudden infant death syndrome and infantile hypertrophic pyloric stenosis: a common cause? Pediatrics 2001; 108: E70.
Statistics New Zealand. 2013 Census QuickStats about culture and identity. 2014. [Cited 23 May 2019.] Available from URL: www.stats.govt.nz
To T, Wajja A, Wales PW, Langer JC. Population demographic indicators associated with incidence of pyloric stenosis. Arch. Pediatr. Adolesc. Med. 2005; 159: 520-5.
