{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T03:18:51Z","timestamp":1787800731141,"version":"build-2784847793"},"reference-count":20,"publisher":"Elsevier BV","issue":"9","license":[{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/tdm\/userlicense\/1.0\/"},{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/www.elsevier.com\/legal\/tdmrep-license"}],"content-domain":{"domain":["clinicalkey.com","clinicalkey.com.au","clinicalkey.es","clinicalkey.fr","clinicalkey.jp","elsevier.es","revespcardiol.org","elsevier.com","sciencedirect.com"],"crossmark-restriction":true},"short-container-title":["Revista Espa\u00f1ola de Cardiolog\u00eda (English Edition)"],"published-print":{"date-parts":[[2026,9]]},"DOI":"10.1016\/j.rec.2026.03.013","type":"journal-article","created":{"date-parts":[[2026,5,27]],"date-time":"2026-05-27T16:02:00Z","timestamp":1779897720000},"page":"763-773","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":0,"title":["Preliminary validation of an echocardiographic formula for estimating left ventricular outflow tract area in severe aortic stenosis"],"prefix":"10.1016","volume":"79","author":[{"given":"Onelia T.","family":"Greatty Cremonesi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carmen","family":"Olmos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eduardo","family":"Pozo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patricia","family":"Mah\u00eda","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda","family":"Rivadeneira Ruiz","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mar\u00eda","family":"Luaces","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pedro","family":"Marcos-Alberca","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9 Juan","family":"G\u00f3mez de Diego","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9 Alberto","family":"de Agust\u00edn","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"78","reference":[{"key":"10.1016\/j.rec.2026.03.013_bib0105","doi-asserted-by":"crossref","first-page":"753","DOI":"10.1016\/S0735-1097(97)00200-3","article-title":"Planimetry and transthoracic two-dimensional echocardiography in noninvasive assessment of aortic valve area in patients with valvular aortic stenosis","volume":"30","author":"Okura","year":"1997","journal-title":"J Am Coll Cardiol."},{"key":"10.1016\/j.rec.2026.03.013_bib0110","doi-asserted-by":"crossref","DOI":"10.3390\/diagnostics12071656","article-title":"Calculation of Aortic VAlve and LVOT Areas by a Modified Continuity Equation Using Different Echocardiography Methods: The CAVALIER Study","volume":"12","author":"Ruf","year":"2022","journal-title":"Diagnostics."},{"key":"10.1016\/j.rec.2026.03.013_bib0115","doi-asserted-by":"crossref","first-page":"5120","DOI":"10.3390\/jcm10215120","article-title":"Diagnostic Work-Up of the Aortic Patient: An Integrated Approach toward the Best Therapeutic Option","volume":"10","author":"Pighi","year":"2021","journal-title":"J Clin Med."},{"key":"10.1016\/j.rec.2026.03.013_bib0120","doi-asserted-by":"crossref","first-page":"357","DOI":"10.1007\/s10554-019-01715-5","article-title":"Comparison of the geometry of the left ventricle outflow tract, the aortic root and the ascending aorta in patients with severe tricuspid aortic stenosis versus healthy controls","volume":"36","author":"Niezna\u0144ska","year":"2020","journal-title":"Int J Cardiovasc Imaging."},{"key":"10.1016\/j.rec.2026.03.013_bib0125","doi-asserted-by":"crossref","first-page":"372","DOI":"10.1016\/j.echo.2017.02.009","article-title":"Recommendations on the Echocardiographic Assessment of Aortic Valve Stenosis: A Focused Update from the European Association of Cardiovascular Imaging and the American Society of Echocardiography","volume":"30","author":"Baumgartner","year":"2017","journal-title":"J Am Soc Echocardiogr."},{"key":"10.1016\/j.rec.2026.03.013_bib0130","doi-asserted-by":"crossref","first-page":"248","DOI":"10.1016\/j.jcmg.2015.01.009","article-title":"Aortic Valve Area Calculation in Aortic Stenosis by CT and Doppler Echocardiography","volume":"8","author":"Clavel","year":"2015","journal-title":"JACC Cardiovasc Imaging."},{"key":"10.1016\/j.rec.2026.03.013_bib0135","doi-asserted-by":"crossref","first-page":"810","DOI":"10.1161\/01.CIR.72.4.810","article-title":"Noninvasive estimation of valve area in patients with aortic stenosis by Doppler ultrasound and two-dimensional echocardiography","volume":"72","author":"Skjaerpe","year":"1985","journal-title":"Circulation."},{"key":"10.1016\/j.rec.2026.03.013_bib0140","first-page":"341","article-title":"Din\u00e1mica del tracto de salida del ventr\u00edculo izquierdo durante el ciclo cardiaco evaluada con ecocardiograf\u00eda tridimensional","volume":"80","author":"Falconi","year":"2012","journal-title":"Rev Argent Cardiol."},{"key":"10.1016\/j.rec.2026.03.013_bib0145","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1186\/s12968-017-0344-8","article-title":"Impact of left ventricular outflow tract ellipticity on the grading of aortic stenosis in patients with normal ejection fraction","volume":"19","author":"Maes","year":"2016","journal-title":"J Cardiovasc Magn Reson."},{"key":"10.1016\/j.rec.2026.03.013_bib0150","doi-asserted-by":"crossref","first-page":"1343","DOI":"10.1016\/j.athoracsur.2013.05.018","article-title":"Impact of Three-Dimensional Echocardiography on Classification of the Severity of Aortic Stenosis","volume":"96","author":"Jainandunsing","year":"2013","journal-title":"Ann Thorac Surg."},{"key":"10.1016\/j.rec.2026.03.013_bib0155","doi-asserted-by":"crossref","first-page":"796","DOI":"10.1053\/j.jvca.2020.11.031","article-title":"Appraising the Left Ventricular Outflow Tract: An Ongoing Challenge","volume":"35","author":"Zaky","year":"2021","journal-title":"J Cardiothorac Vasc Anesth."},{"key":"10.1016\/j.rec.2026.03.013_bib0160","doi-asserted-by":"crossref","first-page":"1668","DOI":"10.2214\/AJR.08.1986","article-title":"Differences in Aortic Valve Area Measured with CT Planimetry and Echocardiography (Continuity Equation) Are Related to Divergent Estimates of Left Ventricular Outflow Tract Area","volume":"192","author":"Halpern","year":"2009","journal-title":"Am J Roentgenol."},{"key":"10.1016\/j.rec.2026.03.013_bib0165","first-page":"958","article-title":"TAVR outcome after reclassification of aortic valve stenosis by using a hybrid continuity equation that combines computed tomography and echocardiography data","volume":"96","author":"Weber","year":"2020","journal-title":"Catheter Cardiovasc Interv."},{"key":"10.1016\/j.rec.2026.03.013_bib0170","doi-asserted-by":"crossref","first-page":"1038","DOI":"10.1016\/j.echo.2017.06.002","article-title":"Accurate Measurement of Left Ventricular Outflow Tract Diameter: Comment on the Updated Recommendations for the Echocardiographic Assessment of Aortic Valve Stenosis","volume":"30","author":"Hahn","year":"2017","journal-title":"J Am Soc Echocardiogr."},{"key":"10.1016\/j.rec.2026.03.013_bib0175","doi-asserted-by":"crossref","first-page":"524.e1","DOI":"10.1016\/j.recesp.2021.11.023","article-title":"2021 ESC\/EACTS Guidelines for the management of valvular heart disease: Developed by the Task Force for the management of valvular heart disease of the European Society of Cardiology (ESC) and the European Association for Cardio-Thoracic Surgery (EACTS)s","volume":"75","author":"Vahanian","year":"2022","journal-title":"Rev Esp Cardiol."},{"key":"10.1016\/j.rec.2026.03.013_bib0180","doi-asserted-by":"crossref","first-page":"307","DOI":"10.1016\/S0140-6736(86)90837-8","article-title":"Statistical methods for assessing agreement between two methods of clinical measurement","volume":"1","author":"Bland","year":"1986","journal-title":"Lancet."},{"key":"10.1016\/j.rec.2026.03.013_bib0185","series-title":"The Elements of Statistical Learning: Data Mining, Inference and Prediction","first-page":"241","author":"Hastie","year":"2009"},{"key":"10.1016\/j.rec.2026.03.013_bib0190","doi-asserted-by":"crossref","first-page":"64","DOI":"10.1016\/j.ijcard.2008.04.070","article-title":"Direct measurement of left ventricular outflow tract by transthoracic real-time 3D-echocardiography increases accuracy in assessment of aortic valve stenosis","volume":"136","author":"Khaw","year":"2009","journal-title":"Int J Cardiol."},{"key":"10.1016\/j.rec.2026.03.013_bib0195","doi-asserted-by":"crossref","first-page":"267","DOI":"10.1111\/j.2517-6161.1996.tb02080.x","article-title":"Regression Shrinkage and Selection via the Lasso","volume":"58","author":"Tibshirani","year":"1996","journal-title":"J R Stat Soc Series B."},{"key":"10.1016\/j.rec.2026.03.013_bib0200","doi-asserted-by":"crossref","first-page":"88","DOI":"10.1016\/j.jclinepi.2020.12.005","article-title":"Penalization and shrinkage methods produced unreliable clinical prediction models especially when sample size was small","volume":"132","author":"Riley","year":"2021","journal-title":"J Clin Epidemiol."}],"container-title":["Revista Espa\u00f1ola de Cardiolog\u00eda (English Edition)"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S1885585726001088?httpAccept=text\/xml","content-type":"text\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/api.elsevier.com\/content\/article\/PII:S1885585726001088?httpAccept=text\/plain","content-type":"text\/plain","content-version":"vor","intended-application":"text-mining"}],"deposited":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T02:40:47Z","timestamp":1787798447000},"score":1,"resource":{"primary":{"URL":"https:\/\/linkinghub.elsevier.com\/retrieve\/pii\/S1885585726001088"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,9]]},"references-count":20,"journal-issue":{"issue":"9","published-print":{"date-parts":[[2026,9]]}},"alternative-id":["S1885585726001088"],"URL":"https:\/\/doi.org\/10.1016\/j.rec.2026.03.013","relation":{},"ISSN":["1885-5857"],"issn-type":[{"value":"1885-5857","type":"print"}],"subject":[],"published":{"date-parts":[[2026,9]]},"assertion":[{"value":"Elsevier","name":"publisher","label":"This article is maintained by"},{"value":"Preliminary validation of an echocardiographic formula for estimating left ventricular outflow tract area in severe aortic stenosis","name":"articletitle","label":"Article Title"},{"value":"Revista Espa\u00f1ola de Cardiolog\u00eda (English Edition)","name":"journaltitle","label":"Journal Title"},{"value":"https:\/\/doi.org\/10.1016\/j.rec.2026.03.013","name":"articlelink","label":"CrossRef DOI link to publisher maintained version"},{"value":"https:\/\/doi.org\/10.1016\/j.recesp.2026.03.002","name":"associatedlink","label":"CrossRef DOI link to the associated document"},{"value":"article","name":"content_type","label":"Content Type"},{"value":"\u00a9 2026 Sociedad Espa\u00f1ola de Cardiolog\u00eda. Published by Elsevier Espa\u00f1a, S.L.U. All rights are reserved, including those for text and data mining, AI training, and similar technologies.","name":"copyright","label":"Copyright"}]}}