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The prognosis of HCM depends on the underlying diagnosis. In this review, we emphasize the importance to consider hyperinsulinism in the differential diagnosis of HCM, as hyperinsulinism is widely associated with cardiac hypertrophy (CH) which cannot be distinguished from HCM on echocardiographic examination. We supply an overview of the incidence and treatment strategies of neonatal CH in a broad spectrum of hyperinsulinemic diseases. Reviewing the literature, we found that CH is reported in 13 to 44% of infants of diabetic mothers, in approximately 40% of infants with congenital hyperinsulinism, in 61% of infants with leprechaunism and in 48 to 61% of the patients with congenital generalized lipodystrophy. The correct diagnosis is of importance since there is a large variation in prognoses and there are various strategies to treat CH in hyperinsulinemic diseases.<\/jats:p><jats:p><jats:italic>Conclusion<\/jats:italic>: The relationship between CH and hyperinsulism has implications for clinical practice as it might help to establish the correct diagnosis in neonates with cardiac hypertrophy which has both prognostic and therapeutic consequences. In addition, CH should be recognized as a potential comorbidity which might necessitate treatment in all neonates with known hyperinsulinism.<jats:table-wrap><jats:table><jats:tbody><jats:tr><jats:td colspan=\"2\"><jats:bold>What is Known:<\/jats:bold>\u2022 <jats:italic>Hyperinsulinism is currently not acknowledged as a cause of hypertrophic cardiomyopathy (HCM) in textbooks and recent Pediatric Cardiomyopathy Registry publications.<\/jats:italic><jats:bold>What is New:<\/jats:bold>\u2022 <jats:italic>This article presents an overview of the literature of hyperinsulinism in neonates and infants showing that hyperinsulinism is associated with cardiac hypertrophy (CH) in a broad range of hyperinsulinemic diseases.<\/jats:italic>\u2022 <jats:italic>As CH cannot be distinguished from HCM on echocardiographic examination, we emphasize the importance to consider hyperinsulinism in the differential diagnosis of HCM\/CH as establishing the correct diagnosis has both prognostic and therapeutic consequences.<\/jats:italic><\/jats:td><\/jats:tr><\/jats:tbody><\/jats:table><\/jats:table-wrap><\/jats:p>","DOI":"10.1007\/s00431-019-03521-6","type":"journal-article","created":{"date-parts":[[2019,12,16]],"date-time":"2019-12-16T02:02:28Z","timestamp":1576461748000},"page":"39-50","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":46,"title":["Neonatal cardiac hypertrophy: the role of hyperinsulinism\u2014a review of literature"],"prefix":"10.1007","volume":"179","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4915-7127","authenticated-orcid":false,"given":"Nina D.","family":"Paauw","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raymond","family":"Stegeman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Monique A. 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