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The aortic root diameter is affected by the patient\u2019s age, sex, and body surface area. Therefore, the aortic root diameter needs to be determined and expressed as a <jats:italic>z<\/jats:italic>-score. Calculation of the <jats:italic>z<\/jats:italic>-score is time-consuming and problematic if used infrequently. This study aimed to introduce a simple screening method for identifying aortic root dilation in children. The study population consisted of 190 children who were diagnosed with Marfan syndrome or Marfan-like disorders. The aortic root ratio (ARr) was formulated. The value of the ARr was compared in each patient with the results in <jats:italic>z<\/jats:italic>-scores, which were obtained using on-line calculators based on the most widespread nomograms. The optimal cut-off value of the ARr was \u2265\u200918.7. At this cut-off point, the sensitivity of the ARr ranged from 88.3% to 100% and the specificity ranged from 94% to 97.8%. All of the patients in whom the ARr failed to identify aortic root dilation were also divergently classified by different nomograms. At the ARr cut-off point of \u2265\u200918.0, a sensitivity of 100% was achieved for all nomograms with minimal reduction in specificity. The ARr allows for rapid and precise screening for aortic root dilation in children. Unlike classic analysis, the ARr does not require nomograms or on-line calculations.<\/jats:p>","DOI":"10.1007\/s00246-020-02307-0","type":"journal-article","created":{"date-parts":[[2020,1,31]],"date-time":"2020-01-31T10:03:02Z","timestamp":1580464982000},"page":"632-641","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["New Screening Tool for Aortic Root Dilation in Children with Marfan Syndrome and Marfan-Like Disorders"],"prefix":"10.1007","volume":"41","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1238-4369","authenticated-orcid":false,"given":"Lidia","family":"Wozniak-Mielczarek","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert","family":"Sabiniewicz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rados\u0142aw","family":"Nowak","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Natasza","family":"Gilis-Malinowska","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michalina","family":"Osowicka","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maksymilian","family":"Mielczarek","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2020,1,31]]},"reference":[{"key":"2307_CR1","doi-asserted-by":"publisher","first-page":"1965","DOI":"10.1016\/S0140-6736(05)67789-6","volume":"366","author":"DP Judge","year":"2005","unstructured":"Judge DP, Dietz HC (2005) Marfan\u2019s syndrome. 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This article does not contain any studies with animals performed by any of the authors.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical Approval"}},{"value":"Informed consent was obtained from all individual participants included in the study.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Informed Consent"}}]}}