{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2024,5,13]],"date-time":"2024-05-13T00:06:24Z","timestamp":1715558784562},"reference-count":20,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"4","content-domain":{"domain":["www.ahajournals.org"],"crossmark-restriction":true},"short-container-title":["Circulation"],"published-print":{"date-parts":[[1997,2,18]]},"abstract":"<jats:p>\n            <jats:italic>Background<\/jats:italic>\n            Several lines of evidence indicate a two-stage failure mode for the Bjo\u00a8rk-Shiley convexo-concave (C\/C) heart valve, in which one of the two outlet strut legs separates from the flange before the other, potentially providing an opportunity to identify and prophylactically replace failure-prone valves. Radiographic single leg separation (SLS) detection, although successful, is subjective and skill intensive, implying a need for both an objective preliminary screen and subsequent corroboration of the radiographic findings.\n          <\/jats:p>\n          <jats:p>\n            <jats:italic>Methods and Results<\/jats:italic>\n            We developed a time-windowed, power density analysis of C\/C valve closing sounds to detect the vibrational resonance that characterizes the presence of an intact outlet strut in clinically functioning, 29-mm-flange size C\/C valves. Recordings from more than 800 patients enrolled in radiographic SLS detection studies were analyzed, and the assessment algorithm was evaluated through a blinded test of 32 study valves for which the true status became known consequent to an autopsy or surgical explantation. Valves were objectively scored on a 0-to-1 scale, with 1 being assuredly intact and scores of &lt;0.50 indicating a probable SLS. All except five valves (incorrectly designated probable SLS) were classified correctly, for a sensitivity of 1.00 (95% confidence interval, 0.79 to 1.00) and a specificity of 0.69 (0.41 to 0.89).\n          <\/jats:p>\n          <jats:p>\n            <jats:italic>Conclusions<\/jats:italic>\n            This level of accuracy is sufficient to serve as an effective preliminary screen, potentially allowing a threefold concentration of SLS prevalence among the C\/C valves of patients undergoing radiographic assessment. The value of acoustic classification in avoiding unnecessary operations prompted by false-positive radiographs is less certain.\n          <\/jats:p>","DOI":"10.1161\/01.cir.95.4.905","type":"journal-article","created":{"date-parts":[[2012,6,12]],"date-time":"2012-06-12T00:41:02Z","timestamp":1339461662000},"page":"905-909","update-policy":"http:\/\/dx.doi.org\/10.1161\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":11,"title":["Acoustic Assessment of the Physical Integrity of Bjo\u00a8rk-Shiley Convexo-Concave Heart Valves"],"prefix":"10.1161","volume":"95","author":[{"given":"J.J.","family":"Dow","sequence":"first","affiliation":[{"name":"Tracor Applied Sciences, Inc (J.J.D., T.D.P., K.S., H.R., M.H.), Austin, Tex; and Shiley Heart Valve Research Center (D.W.W., J.G.C.), Irvine, Calif."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Terry D.","family":"Plemons","sequence":"additional","affiliation":[{"name":"Tracor Applied Sciences, Inc (J.J.D., T.D.P., K.S., H.R., M.H.), Austin, Tex; and Shiley Heart Valve Research Center (D.W.W., J.G.C.), Irvine, Calif."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kent","family":"Scarbrough","sequence":"additional","affiliation":[{"name":"Tracor Applied Sciences, Inc (J.J.D., T.D.P., K.S., H.R., M.H.), Austin, Tex; and Shiley Heart Valve Research Center (D.W.W., J.G.C.), Irvine, Calif."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hugh","family":"Reeder","sequence":"additional","affiliation":[{"name":"Tracor Applied Sciences, Inc (J.J.D., T.D.P., K.S., H.R., M.H.), Austin, Tex; and Shiley Heart Valve Research Center (D.W.W., J.G.C.), Irvine, Calif."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mike","family":"Hovenga","sequence":"additional","affiliation":[{"name":"Tracor Applied Sciences, Inc (J.J.D., T.D.P., K.S., H.R., M.H.), Austin, Tex; and Shiley Heart Valve Research Center (D.W.W., J.G.C.), Irvine, Calif."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David W.","family":"Wieting","sequence":"additional","affiliation":[{"name":"Tracor Applied Sciences, Inc (J.J.D., T.D.P., K.S., H.R., M.H.), Austin, Tex; and Shiley Heart Valve Research Center (D.W.W., J.G.C.), Irvine, Calif."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"James G.","family":"Chandler","sequence":"additional","affiliation":[{"name":"Tracor Applied Sciences, Inc (J.J.D., T.D.P., K.S., H.R., M.H.), Austin, Tex; and Shiley Heart Valve Research Center (D.W.W., J.G.C.), Irvine, Calif."}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"276","reference":[{"key":"e_1_3_2_1_2","doi-asserted-by":"publisher","DOI":"10.1007\/s002689900143"},{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1056\/NEJM199508173330703"},{"key":"e_1_3_2_3_2","first-page":"640","volume":"4","year":"1995","unstructured":"Walker AM, Funch DP, Sulsky SI, Dreyer NA. Manufacturing characteristics associated with strut fracture in Bjo\u00a8rk-Shiley 60\u00b0 convexo-concave heart valves. J Heart Valve Dis. 1995;4:640-648.","journal-title":"J Heart Valve Dis"},{"key":"e_1_3_2_4_2","first-page":"48","volume":"7","year":"1994","unstructured":"Chia R. Finite element analysis of vibrations of the Bjo\u00a8rk-Shiley convexo-concave heart valve. Proc Annu IEEE Symp Computer-Based Med Sys. 1994;7:48-52.","journal-title":"Proc Annu IEEE Symp Computer-Based Med Sys"},{"key":"e_1_3_2_5_2","first-page":"389","volume":"15","year":"1993","unstructured":"Plemons TD, Hovenga M, Reeder H, Dow JJ, Inderbitzen B, Chia R, Wieting D. Classification of the Bjo\u00a8rk-Shiley convexo-concave valve status by detection of the intact outlet strut resonant frequency. Proc. Annu Int Conf IEEE Eng Med Biol Sci.. 1993;15:389-390.","journal-title":"Proc. Annu Int Conf IEEE Eng Med Biol Sci."},{"key":"e_1_3_2_6_2","first-page":"119","volume":"7","year":"1994","unstructured":"Plemons TD, Schreck SG, Inderbitzen RS. Stability of the BSCC heart valve outlet strut resonant frequency under changing physiological conditions and observation times. Proc Annu IEEE Symp Computer-Based Med Sys. 1994;7:119-124.","journal-title":"Proc Annu IEEE Symp Computer-Based Med Sys"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.1121\/1.411957"},{"key":"e_1_3_2_8_2","first-page":"125","volume":"7","year":"1994","unstructured":"Plemons TD, Dow JJ, Wieting DW, Chandler JG. Multiple feature acoustic classification of BSCC artificial heart valves. Proc Annu IEEE Symp Computer-Based Med Sys. 1994;7:125-130.","journal-title":"Proc Annu IEEE Symp Computer-Based Med Sys"},{"key":"e_1_3_2_9_2","first-page":"131","volume":"7","year":"1994","unstructured":"Scarbrough K, Inderbitzen RS. 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