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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">CardioSomatics</journal-id><journal-title-group><journal-title xml:lang="en">CardioSomatics</journal-title><trans-title-group xml:lang="ru"><trans-title>CardioСоматика</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2221-7185</issn><issn publication-format="electronic">2658-5707</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">108733</article-id><article-id pub-id-type="doi">10.17816/CS108733</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Original study articles</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Оригинальные статьи</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">A comparison of the diagnostic capabilities of the ratio of acceleration time to total left ventricular ejection time (AT/ET) in determining the severity of aortic stenosis in patients with bicuspid and tricuspid aortic valve: retrospective comparative study</article-title><trans-title-group xml:lang="ru"><trans-title>Сопоставимость диагностических возможностей отношения времени ускорения к общему времени выброса левого желудочка (AT/ET) в определении тяжести аортального стеноза у пациентов с дву- и трёхстворчатым строением аортального клапана: ретроспективное сравнительное исследование</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6089-9722</contrib-id><contrib-id contrib-id-type="spin">3153-8026</contrib-id><name-alternatives><name xml:lang="en"><surname>Bazylev</surname><given-names>Vladlen V.</given-names></name><name xml:lang="ru"><surname>Базылев</surname><given-names>Владлен Владленович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, D. Sci. (Med.), Prof.</p></bio><bio xml:lang="ru"><p>д-р мед. наук, проф., гл. врач, врач сердечно-сосудистый хирург</p></bio><email>cardio-penza@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-7338-9462</contrib-id><contrib-id contrib-id-type="spin">2393-1170</contrib-id><name-alternatives><name xml:lang="en"><surname>Babukov</surname><given-names>Ruslan M.</given-names></name><name xml:lang="ru"><surname>Бабуков</surname><given-names>Руслан Медарисович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>cardiologist, ultrasound diagnosis doctor</p></bio><bio xml:lang="ru"><p>врач-кардиолог, врач ультразвуковой диагностики отд-ния ультразвуковой и функциональной диагностики</p></bio><email>ruslan.babukov@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5482-3211</contrib-id><contrib-id contrib-id-type="spin">1107-7579</contrib-id><name-alternatives><name xml:lang="en"><surname>Bartosh</surname><given-names>Fedor L.</given-names></name><name xml:lang="ru"><surname>Бартош</surname><given-names>Федор Леонидович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Med.)</p></bio><bio xml:lang="ru"><p>канд. мед. наук, зав. отд-нием ультразвуковой и функциональной диагностики</p></bio><email>cardio-penza@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-3210-3974</contrib-id><name-alternatives><name xml:lang="en"><surname>Levina</surname><given-names>Alena V.</given-names></name><name xml:lang="ru"><surname>Лёвина</surname><given-names>Алёна Витальевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>ultrasound diagnosis doctor</p></bio><bio xml:lang="ru"><p>врач ультразвуковой диагностикиотд-ния ультразвуковой и функциональной диагностики</p></bio><email>goralen1@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9519-5036</contrib-id><contrib-id contrib-id-type="spin">3303-2522</contrib-id><name-alternatives><name xml:lang="en"><surname>Mikulyаk</surname><given-names>Artur I.</given-names></name><name xml:lang="ru"><surname>Микуляк</surname><given-names>Артур Иванович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>MD, Cand. Sci. (Med.)</p></bio><bio xml:lang="ru"><p>канд. мед. наук, зав. кардиохирургическим отд-нием № 1, врач сердечно-сосудистый хирург</p></bio><email>cardio-penza@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Federal Centre for Cardiovascular Surgery</institution></aff><aff><institution xml:lang="ru">ФГБУ «Федеральный центр сердечно-сосудистой хирургии» Минздрава России</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2023-03-27" publication-format="electronic"><day>27</day><month>03</month><year>2023</year></pub-date><pub-date date-type="pub" iso-8601-date="2022-12-12" publication-format="electronic"><day>12</day><month>12</month><year>2022</year></pub-date><volume>13</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>192</fpage><lpage>197</lpage><history><date date-type="received" iso-8601-date="2022-06-14"><day>14</day><month>06</month><year>2022</year></date><date date-type="accepted" iso-8601-date="2023-03-18"><day>18</day><month>03</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Bazylev V.V., Babukov R.M., Bartosh F.L., Levina A.V., Mikulyаk A.I.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Базылев В.В., Бабуков Р.М., Бартош Ф.Л., Лёвина А.В., Микуляк А.И.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Bazylev V.V., Babukov R.M., Bartosh F.L., Levina A.V., Mikulyаk A.I.</copyright-holder><copyright-holder xml:lang="ru">Базылев В.В., Бабуков Р.М., Бартош Ф.Л., Лёвина А.В., Микуляк А.И.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by-nc-sa/4.0/</ali:license_ref></license></permissions><self-uri xlink:href="https://cardiosomatics.ru/2221-7185/article/view/108733">https://cardiosomatics.ru/2221-7185/article/view/108733</self-uri><abstract xml:lang="en"><p><bold>Objective</bold>. We aimed to compare the diagnostic capabilities of the ratio of acceleration time to total left ventricular ejection time (AT/ET) in determining the severity of aortic stenosis (AS) in patients with bicuspid and tricuspid aortic valves (AV).</p> <p><bold>Material and methods</bold>. We retrospectively analyzed the data of 187 patients with moderate and severe AS who underwent diagnostic examination at the Penza Federal Center for Cardiovascular Surgery. The patients were divided into 2 groups based on whether their AV was tricuspid or bicuspid. Visual assessment of the AV structure was performed using transthoracic echocardiography (TTE). In indeterminate cases, computed tomography was used for the assessment.</p> <p><bold>Results</bold>. A comparative analysis of the echocardiographic characteristics of patients with tricuspid and bicuspid AV did not reveal a statistically significant difference between the patient groups (<italic>p ≤</italic>0.05). Linear regression analysis in patients with a tricuspid AV demonstrated a statistically significant correlation between AT/ET scores and peak gradient (G<sub>max</sub>) (<italic>r=</italic>0.68, <italic>р</italic><italic>=</italic>0.03), mean gradient (G<sub>mean</sub>) (<italic>r=</italic>0.78, <italic>р</italic><italic>=</italic>0.01), effective orifice area (EOA) (<italic>r=</italic>0.7, <italic>р</italic><italic>=</italic>0.03), and doppler velocity index (DVI) scores (<italic>r=</italic>0.72, <italic>р</italic><italic>=</italic>0.02). In patients with a bicuspid AV, a similarly significant correlation was found between the AT/ET index and G<sub>max</sub> (<italic>r=</italic>0.67, <italic>р</italic><italic>=</italic>0.02), G<sub>mean</sub> (<italic>r=</italic>0.8, р &lt;0.001), EOA (<italic>r=</italic>0.72, <italic>р</italic><italic>=</italic>0.04), and DVI (<italic>r=</italic>0.75, <italic>р</italic><italic>=</italic>0.01). The receiver operating characteristic analysis demonstrated a high predictive ability of AT/ET for severe aortic valve stenosis (with a value &gt;0.35). The area under the curve in patients with tricuspid and bicuspid AV was 84 (<italic>p &lt;</italic>0.001) and 86 (<italic>p &lt;</italic>0.001), respectively. For determining severe AV stenosis in patients with a tricuspid AV, the sensitivity and specificity of AT/ET &gt;0.35 was 84% and 75%, respectively; and in patients with a bicuspid AV, it was 87% and 78%, respectively.</p> <p><bold>Conclusion</bold>. The AT/ET ratio has comparable diagnostic capabilities in determining severe AS in patients with tricuspid and bicuspid AV structures. The AT/ET &gt;0.35 is a highly sensitive parameter for defining severe AS for both morphologies of AV.</p></abstract><trans-abstract xml:lang="ru"><p><bold>Цель</bold>. Сравнить сопоставимость диагностических возможностей соотношения времени ускорения к общему времени выброса левого желудочка (AT/ET) в определении тяжести аортального стеноза (АС) у пациентов с дву- и трёхстворчатым строением аортального клапана (АК).</p> <p><bold>Материал и методы</bold>. Ретроспективно проанализированы данные 187 пациентов с умеренным и тяжёлым АС, которые проходили диагностическое обследование в ФЦССХ (Пенза). Пациенты были разделены на 2 группы в зависимости от строения (трёх- или и двустворчатого) АК. Визуальную оценку строения АК проводили с помощью трансторакальной эхокардиографии, в неопределённых случаях применяли компьютерную томографию.</p> <p><bold>Результаты</bold>. Сравнительный анализ эхокардиографических характеристик групп пациентов с трёх- и двустворчатым строением АК не продемонстрировал статистически значимой разницы у пациентов как с тяжёлым, так и с умеренным стенозом АК (<italic>p ≤</italic>0,05). Анализ линейной регрессии у пациентов с трёхстворчатым АК показал статистически значимую корреляционную связь между показателями АT/ET и G<sub>max</sub> (r=0,68, <italic>р=</italic>0,03), G<sub>mean</sub> (r=0,78, <italic>р=</italic>0,01), EOA (r=0,7, <italic>р=</italic>0,03) и DVI (r=0,72, <italic>р=</italic>0,02). Аналогичная значимая корреляционная связь была обнаружена и у пациентов с двустворчатым строением АК между показателя АT/ET и G<sub>max</sub> (r=0,67, <italic>р=</italic>0,02), G<sub>mean</sub> (r=0,8, <italic>р &lt;</italic>0,001), EOA (r=0,72, <italic>р=</italic>0,04) и DVI (r=0,75, <italic>р=</italic>0,01). Кривая RОC-анализа продемонстрировала высокую предсказательную способность тяжёлого стеноза АК показателем АT/ET (при значении &gt;0,35) как у пациентов с трёх-, так и с двустворчатым строением АК: площади под кривой AUC=84 (<italic>p &lt;</italic>0,001) и АUC=0,86 (<italic>p &lt;</italic>0,001) соответственно. Чувствительность и специфичность показателя AT/ET &gt;0,35 в определении тяжёлого стеноза АК у пациентов с трёхстворчатым АК составили 84 и 75% соответственно, у пациентов с двустворчатым строением АК – 87 и 78% соответственно.</p> <p><bold>Заключение</bold>. Отношение AT/ET обладает сопоставимыми диагностическими возможностями в определении тяжёлого АС как у пациентом с трёх-, так и с двустворчатым строением АК. Пороговое значение AT/ET &gt;0,35 является высокочувствительным параметром для определения тяжёлого АС для обеих морфологий АК.</p></trans-abstract><kwd-group xml:lang="en"><kwd>aortic stenosis</kwd><kwd>bicuspid aortic valve</kwd><kwd>AT/ET ratio</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>аортальный стеноз</kwd><kwd>двустворчатый аортальный клапан</kwd><kwd>трехстворчатый аортальный клапан</kwd><kwd>соотношение AT/ET</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Barasch E, Fan D, Chukwu EO, et al. Severe isolated aortic stenosis with normal left ventricular systolic function and low transvalvular gradients: pathophysiologic and prognostic insights. J Heart Valve Dis. 2008;17(1):81–88.</mixed-citation><mixed-citation xml:lang="ru">Barasch E., Fan D., Chukwu E.O., et al. Severe isolated aortic stenosis with normal left ventricular systolic function and low transvalvular gradients: pathophysiologic and prognostic insights // J Heart Valve Dis. 2008. Vol. 17, N 1. P. 81–88.</mixed-citation></citation-alternatives></ref><ref id="B2"><label>2.</label><citation-alternatives><mixed-citation xml:lang="en">Minners J, Allgeier M, Gohlke-Baerwolf C, et al. Inconsistent grading of aortic valve stenosis by current guidelines: haemodynamic studies in patients with apparently normal left ventricular function. Heart. 2010;96(18):1463–1468. doi: 10.1136/hrt.2009.181982</mixed-citation><mixed-citation xml:lang="ru">Minners J., Allgeier M., Gohlke-Baerwolf C., et al. Inconsistent grading of aortic valve stenosis by current guidelines: haemodynamic studies in patients with apparently normal left ventricular function // Heart. 2010. Vol. 96, N 18. P. 1463–1468. doi: 10.1136/hrt.2009.181982</mixed-citation></citation-alternatives></ref><ref id="B3"><label>3.</label><citation-alternatives><mixed-citation xml:lang="en">Belkin RN, Khalique O, Aronow WS, et al. Outcomes and survival with aortic valve replacement compared with medical therapy in patients with low-, moderate-, and severe-gradient severe aortic stenosis and normal left ventricular ejection fraction. Echocardiography. 2011;28(4):378–387. doi: 10.1111/j.1540-8175.2010.01372.x</mixed-citation><mixed-citation xml:lang="ru">Belkin R.N., Khalique O., Aronow W.S., et al. Outcomes and survival with aortic valve replacement compared with medical therapy in patients with low-, moderate-, and severe-gradient severe aortic stenosis and normal left ventricular ejection fraction // Echocardiography. 2011. Vol. 28, N 4. P. 378–387. doi: 10.1111/j.1540-8175.2010.01372.x</mixed-citation></citation-alternatives></ref><ref id="B4"><label>4.</label><citation-alternatives><mixed-citation xml:lang="en">Clavel MA, Messika-Zeitoun D, Pibarot P, et al. The complex nature of discordant severe calcified aortic valve disease grading: new insights from combined Doppler echocardiographic and computed tomographic study. J Am Coll Cardiol. 2013;62(24):2329–2338. doi: 10.1016/j.jacc.2013.08.1621</mixed-citation><mixed-citation xml:lang="ru">Clavel M.A., Messika-Zeitoun D., Pibarot P., et al. The complex nature of discordant severe calcified aortic valve disease grading: new insights from combined Doppler echocardiographic and computed tomographic study // J Am Coll Cardiol. 2013. Vol. 62, N 24. P. 2329–2338.doi: 10.1016/j.jacc.2013.08.1621</mixed-citation></citation-alternatives></ref><ref id="B5"><label>5.</label><citation-alternatives><mixed-citation xml:lang="en">Zoghbi WA, Chambers JB, Dumesnil JG, et al. Recommendations for evaluation of prosthetic valves with echocardiography and doppler ultrasound: a report From the American Society of Echocardiography's Guidelines and Standards Committee and the Task Force on Prosthetic Valves, developed in conjunction with the American College of Cardiology Cardiovascular Imaging Committee, Cardiac Imaging Committee of the American Heart Association, the European Association of Echocardiography, a registered branch of the European Society of Cardiology, the Japanese Society of Echocardiography and the Canadian Society of Echocardiography, endorsed by the American College of Cardiology Foundation, American Heart Association, European Association of Echocardiography, a registered branch of the European Society of Cardiology, the Japanese Society of Echocardiography, and Canadian Society of Echocardiography. J Am Soc Echocardiogr. 2009;22(9):975–1014;quiz1082–1084. doi: 10.1016/j.echo.2009.07.013</mixed-citation><mixed-citation xml:lang="ru">Zoghbi W.A., Chambers J.B., Dumesnil J.G., et al. Recommendations for evaluation of prosthetic valves with echocardiography and doppler ultrasound: a report From the American Society of Echocardiography's Guidelines and Standards Committee and the Task Force on Prosthetic Valves, developed in conjunction with the American College of Cardiology Cardiovascular Imaging Committee, Cardiac Imaging Committee of the American Heart Association, the European Association of Echocardiography, a registered branch of the European Society of Cardiology, the Japanese Society of Echocardiography and the Canadian Society of Echocardiography, endorsed by the American College of Cardiology Foundation, American Heart Association, European Association of Echocardiography, a registered branch of the European Society of Cardiology, the Japanese Society of Echocardiography, and Canadian Society of Echocardiography // J Am Soc Echocardiogr. 2009. Vol. 22, N 9. P. 975–1014. Quiz. 1082–1084. doi: 10.1016/j.echo.2009.07.013</mixed-citation></citation-alternatives></ref><ref id="B6"><label>6.</label><citation-alternatives><mixed-citation xml:lang="en">Ben Zekry S, Saad RM, Ozkan M, et al. Flow acceleration time and ratio of acceleration time to ejection time for prosthetic aortic valve function. JACC Cardiovasc Imaging. 2011;4(11):1161–1170. doi: 10.1016/j.jcmg.2011.08.012</mixed-citation><mixed-citation xml:lang="ru">Ben Zekry S., Saad R.M., Ozkan M., et al. Flow acceleration time and ratio of acceleration time to ejection time for prosthetic aortic valve function // JACC Cardiovasc Imaging. 2011. Vol. 4, N 11. P. 1161–1170.doi: 10.1016/j.jcmg.2011.08.012</mixed-citation></citation-alternatives></ref><ref id="B7"><label>7.</label><citation-alternatives><mixed-citation xml:lang="en">Gamaza-Chulián S, Camacho-Freire S, Toro-Cebada R, et al. Ratio of Acceleration Time to Ejection Time for Assessing Aortic Stenosis Severity. Echocardiography. 2015;32(12):1754–1761. doi: 10.1111/echo.12978</mixed-citation><mixed-citation xml:lang="ru">Gamaza-Chulián S., Camacho-Freire S., Toro-Cebada R., et al. Ratio of Acceleration Time to Ejection Time for Assessing Aortic Stenosis Severity // Echocardiography. 2015. Vol. 32, N 12. P. 1754–1761. doi: 10.1111/echo.12978</mixed-citation></citation-alternatives></ref><ref id="B8"><label>8.</label><citation-alternatives><mixed-citation xml:lang="en">Kamimura D, Hans S, Suzuki T, et al. Delayed Time to Peak Velocity Is Useful for Detecting Severe Aortic Stenosis. J Am Heart Assoc. 2016;5(10):e003907. doi: 10.1161/JAHA.116.003907</mixed-citation><mixed-citation xml:lang="ru">Kamimura D., Hans S., Suzuki T., et al. Delayed Time to Peak Velocity Is Useful for Detecting Severe Aortic Stenosis // J Am Heart Assoc. 2016. Vol. 5, N 10. P. e003907. doi: 10.1161/JAHA.116.003907</mixed-citation></citation-alternatives></ref><ref id="B9"><label>9.</label><citation-alternatives><mixed-citation xml:lang="en">Ringle Griguer A, Tribouilloy C, Truffier A, et al. Clinical Significance of Ejection Dynamics Parameters in Patients with Aortic Stenosis: An Outcome Study. J Am Soc Echocardiogr. 2018;31(5):551–560.e2.doi: 10.1016/j.echo.2017.11.015</mixed-citation><mixed-citation xml:lang="ru">Ringle Griguer A., Tribouilloy C., Truffier A., et al. Clinical Significance of Ejection Dynamics Parameters in Patients with Aortic Stenosis: An Outcome Study // J Am Soc Echocardiogr. 2018. Vol. 31, N 5. P. 551.e2–560.e2. doi: 10.1016/j.echo.2017.11.015</mixed-citation></citation-alternatives></ref><ref id="B10"><label>10.</label><citation-alternatives><mixed-citation xml:lang="en">Gamaza-Chulián S, Díaz-Retamino E, Camacho-Freire S, et al. Acceleration Time and Ratio of Acceleration Time to Ejection Time in Aortic Stenosis: New Echocardiographic Diagnostic Parameters. J Am Soc Echocardiogr. 2017;30(10):947–955. doi: 10.1016/j.echo.2017.06.001</mixed-citation><mixed-citation xml:lang="ru">Gamaza-Chulián S., Díaz-Retamino E., Camacho-Freire S., et al. Acceleration Time and Ratio of Acceleration Time to Ejection Time in Aortic Stenosis: New Echocardiographic Diagnostic Parameters // J Am Soc Echocardiogr. 2017. Vol. 30, N 10. P. 947–955. doi: 10.1016/j.echo.2017.06.001</mixed-citation></citation-alternatives></ref><ref id="B11"><label>11.</label><citation-alternatives><mixed-citation xml:lang="en">Bazylev VV, Babukov RM, Bartosh FL, Gorshkova AV. Comparison of the hemodynamic parameters of transaortic blood flow in patients with aortic stenosis depending on the bicuspid or tricuspid valve structure. Medical Visualization. 2020;24(4):74–80. (In Russ).doi: 10.24835/1607-0763-2020-4-74-80</mixed-citation><mixed-citation xml:lang="ru">Базылев В.В., Бабуков Р.М., Бартош Ф.Л., Горшкова А.В. Сравнение гемодинамических параметров трансаортального кровотока у пациентов с аортальным стенозом в зависимости от двустворчатого или трехстворчатого строения клапана // Медицинская визуализация. 2020. Т. 24, № 4. С. 74–80. doi: 10.24835/1607-0763-2020-4-74-80</mixed-citation></citation-alternatives></ref><ref id="B12"><label>12.</label><citation-alternatives><mixed-citation xml:lang="en">Huntley GD, Thaden JJ, Alsidawi S, et al. Comparative study of bicuspid vs. tricuspid aortic valve stenosis. Eur Heart J Cardiovasc Imaging. 2018;19(1):3–8. doi: 10.1093/ehjci/jex211</mixed-citation><mixed-citation xml:lang="ru">Huntley G.D., Thaden J.J., Alsidawi S., et al. Comparative study of bicuspid vs. tricuspid aortic valve stenosis // Eur Heart J Cardiovasc Imaging. 2018. Vol. 19, N 1. P. 3–8. doi: 10.1093/ehjci/jex211</mixed-citation></citation-alternatives></ref><ref id="B13"><label>13.</label><citation-alternatives><mixed-citation xml:lang="en">Richards KE, Deserranno D, Donal E, et al. Influence of structural geometry on the severity of bicuspid aortic stenosis. Am J Physiol Heart Circ Physiol. 2004;287(3):H1410–H1416. doi: 10.1152/ajpheart.00264.2003</mixed-citation><mixed-citation xml:lang="ru">Richards K.E., Deserranno D., Donal E., et al. Influence of structural geometry on the severity of bicuspid aortic stenosis // Am J Physiol Heart Circ Physiol. 2004. Vol. 287, N 3. P. H1410–H1416. doi: 10.1152/ajpheart.00264.2003</mixed-citation></citation-alternatives></ref><ref id="B14"><label>14.</label><citation-alternatives><mixed-citation xml:lang="en">Baumgartner H Chair, Hung J Co-Chair, Bermejo J, et al. 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. Eur Heart J Cardiovasc Imaging. 2017;18(3):254–275. doi: 10.1093/ehjci/jew335</mixed-citation><mixed-citation xml:lang="ru">Baumgartner H. Chair, Hung J. Co-Chair, Bermejo J., et al. 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 // Eur Heart J Cardiovasc Imaging. 2017. Vol. 18, N 3. P. 254–275. doi: 10.1093/ehjci/jew335</mixed-citation></citation-alternatives></ref><ref id="B15"><label>15.</label><citation-alternatives><mixed-citation xml:lang="en">McSweeney J, Dobson L, Macnab A. Acceleration time and ratio of acceleration time and ejection time in bicuspid aortic stenosis; a valid clinical measure? Heart. 2020;106(Suppl 2):A1–A118. doi: 10.1136/heartjnl-2020-BCS.8</mixed-citation><mixed-citation xml:lang="ru">McSweeney J., Dobson L., Macnab A. Acceleration time and ratio of acceleration time and ejection time in bicuspid aortic stenosis; a valid clinical measure? // Heart. 2020. Vol. 106, Suppl. 2. P. A1–A118. doi: 10.1136/heartjnl-2020-BCS.8</mixed-citation></citation-alternatives></ref></ref-list></back></article>
