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Stroke Res."],"published-print":{"date-parts":[[2021,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The left atrial septal pouch (LASP) occurs due to incomplete fusion of septa primum and secundum at the inter-atrial septum, creating an open flap that may serve as a thromboembolic source. Prior studies have demonstrated increased prevalence of LASP in cryptogenic strokes. The aim of the current study was to validate the above findings in a separate, larger group of stroke and non-stroke patients. We examined transesophageal echocardiograms (TEEs) performed between July 2011 and December 2018. LASP prevalence was determined in TEEs referred for ischemic stroke or transient ischemic attack (\u201cstroke\u201d) and compared with LASP prevalence in patients undergoing TEEs for other reasons (\u201cnon-stroke\u201d). Stroke subtyping was performed using the Trial of Org 10172 in Acute Stroke Treatment (TOAST) criteria. There were 306 TEEs from 144 non-stroke and 162 stroke patients. Mean age and sex distribution were 56\u2009\u00b1\u20091 (mean \u00b1 SE) and 65% male in the non-stroke group and 58\u2009\u00b1\u20091 and 54% male in the stroke group. The overall prevalence of LASP was 31%. The prevalence of LASP was 28% (41\/144) in non-stroke patients, 25% (24\/95) in non-cryptogenic stroke patients, and 43% (29\/67) in cryptogenic stroke patients. LASP prevalence was significantly higher in the cryptogenic subgroup compared with the non-cryptogenic subgroup (<jats:italic>p<\/jats:italic>\u2009=\u20090.02). These findings demonstrate a significant association of LASP with risk of cryptogenic stroke, suggesting that LASP may serve as a thromboembolic nidus. Additional studies are needed to determine the generalizability of these findings, and their therapeutic implications, supporting LASP as a stroke risk factor.<\/jats:p>","DOI":"10.1007\/s12975-020-00864-3","type":"journal-article","created":{"date-parts":[[2021,1,4]],"date-time":"2021-01-04T03:03:18Z","timestamp":1609729398000},"page":"205-211","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["The Left Atrial Septal Pouch: A New Stroke Risk Factor?"],"prefix":"10.1007","volume":"12","author":[{"given":"Ruchi","family":"Kapoor","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lara","family":"Wadi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Brian","family":"Becerra","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael","family":"Eskander","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ali","family":"Razmara","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dawn","family":"Lombardo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Annlia","family":"Paganini-Hill","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jin Kyung","family":"Kim","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mark","family":"Fisher","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,1,4]]},"reference":[{"key":"864_CR1","doi-asserted-by":"publisher","first-page":"527","DOI":"10.1161\/CIRCRESAHA.116.308447","volume":"120","author":"S Yaghi","year":"2017","unstructured":"Yaghi S, Bernstein RA, Passman R, Okin PM, Furie KL. Cryptogenic stroke: research and practice. Circ Res. 2017;120:527\u201340.","journal-title":"Circ Res"},{"key":"864_CR2","doi-asserted-by":"publisher","first-page":"64","DOI":"10.1007\/s11910-017-0775-5","volume":"17","author":"H-C Diener","year":"2017","unstructured":"Diener H-C, Bernstein R, Hart R. Secondary stroke prevention in cryptogenic stroke and embolic stroke of undetermined source (ESUS). Curr Neurol Neurosci Rep. 2017;17:64.","journal-title":"Curr Neurol Neurosci Rep"},{"key":"864_CR3","doi-asserted-by":"crossref","unstructured":"Diener H-C, Sacco RL, Easton JD, Granger CB, Bernstein RA, Uchiyama S, et al. Dabigatran for prevention of stroke after embolic stroke of undetermined source. N Engl J Med. 2019;380:1906\u201317.","DOI":"10.1056\/NEJMoa1813959"},{"key":"864_CR4","doi-asserted-by":"crossref","unstructured":"Ntaios G, Swaminathan B, Berkowitz SD, Gagliardi RJ, Lang W, Siegler JE, et al. 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Approval of the study design was obtained from University of California Irvine Institutional Review Board (HS # 2018-4733) prior to proceeding with the study.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics Approval"}},{"value":"A waiver of informed consent was obtained from the Institutional Review Board. All data were collected retrospectively, and patient identifiers were removed prior to analysis.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent to Participate"}},{"value":"Not applicable.","order":5,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for Publication"}},{"value":"Not applicable.","order":6,"name":"Ethics","group":{"name":"EthicsHeading","label":"Code Availability"}}]}}