{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,30]],"date-time":"2025-12-30T08:59:55Z","timestamp":1767085195506},"reference-count":23,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2013,4,15]],"date-time":"2013-04-15T00:00:00Z","timestamp":1365984000000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/www.springer.com\/tdm"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["J Cardiothorac Surg"],"published-print":{"date-parts":[[2013,12]]},"abstract":"<jats:title>Abstract<\/jats:title>\n          <jats:p>Congenital quadricuspid aortic valve is a rare cardiac anomaly. More than half of the patients with this abnormality will develop aortic insufficiency in adulthood. It is vital that patients with quadricuspid aortic valve who present with progressive aortic regurgitation undergo valve replacement or repair at appropriate time. Here, we present two cases of quadricuspid aortic valve. We first describe a 58-year-old man who had mitral regurgitation and ascending aorta dilatation with quadricuspid aortic valve. He underwent aortic valve replacement and mitral valve plasty and recovered well. The second patient is a 20-year-old asymptomatic boy who has been closely followed up and has not received any surgical treatment.<\/jats:p>","DOI":"10.1186\/1749-8090-8-87","type":"journal-article","created":{"date-parts":[[2013,4,15]],"date-time":"2013-04-15T17:00:27Z","timestamp":1366045227000},"update-policy":"http:\/\/dx.doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":13,"title":["Congenital quadricuspid aortic valve associated with aortic insufficiency and mitral regurgitation"],"prefix":"10.1186","volume":"8","author":[{"given":"Jiaquan","family":"Zhu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junwen","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shubin","family":"Wu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yunjiao","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fangbao","family":"Ding","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ju","family":"Mei","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2013,4,15]]},"reference":[{"key":"761_CR1","doi-asserted-by":"publisher","first-page":"186","DOI":"10.1378\/chest.72.2.186","volume":"72","author":"JE Davia","year":"1977","unstructured":"Davia JE: Quadricuspid semilunar valves. 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