Small aortic annulus: the hydrodynamic performances of 5 commercially available bileaflet mechanical valves

The Journal of Thoracic and Cardiovascular Surgery
Tomaso BottioGino Gerosa

Abstract

Hemodynamic performances of mechanical valve prostheses in patients with aortic valve stenosis and a small aortic annulus are crucial. We analyzed the in vitro hydrodynamics of 5 currently available bileaflet mechanical prostheses that fitted a 21-mm-diameter valve holder of a Sheffield pulse duplicator. Three samples of 5 high-performance production-quality prostheses, including the sewing ring cuffs, were tested in the aortic chamber of a Sheffield pulse duplicator. Sizes of the prostheses fitting the 21-mm valve holder were as follows: 18-mm ATS, 19-mm SJM Regent, 19-mm Sorin Bicarbon Slimline, 19-mm On-X, and 21-mm Carbomedics Top Hat. The tests were carried out at a fixed pulse rate (70 beats/min) and at increasing cardiac outputs of 2, 4, 5, and 7 L/min. Each valve was tested 10 times for each different cardiac output. This resulted in a total of 40 tests for each valve and 120 tests for each valve model. The aortic pressure was set at 120/80 mm Hg (mean pressure, 100 mm Hg) throughout the experiment for all cardiac outputs. Forward flow pressure decrease, total regurgitant volume, closing and leakage volumes, effective orifice area, and stroke work loss were recorded while the valve operated under each cardiac output. Th...Continue Reading

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Citations

Jun 13, 2006·The Japanese Journal of Thoracic and Cardiovascular Surgery : Official Publication of the Japanese Association for Thoracic Surgery = Nihon Kyōbu Geka Gakkai Zasshi·Kanji MatsuzakiOsamu Shigeta
Nov 7, 2009·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Andrea BagnoGino Gerosa
Jun 18, 2010·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Shigehiko Tokunaga, Ryuji Tominaga
Jun 1, 2013·General Thoracic and Cardiovascular Surgery·Hiroshi Furukawa, Kazuo Tanemoto
Jul 17, 2008·Interactive Cardiovascular and Thoracic Surgery·Tomaso BottioGino Gerosa
Mar 10, 2006·Current Cardiology Reports·Joseph Huh, Faisal Bakaeen
Sep 6, 2011·The Journal of Thoracic and Cardiovascular Surgery·Tomaso BottioGino Gerosa
Jul 15, 2011·The Journal of Thoracic and Cardiovascular Surgery·Vito MannacioCarlo Vosa
Jun 25, 2008·The Annals of Thoracic Surgery·Suzanne RoedlerMichael Grimm
Nov 7, 2008·Echocardiography·Aaron B YezbickAman Mahajan
Apr 1, 2015·Journal of Mechanics in Medicine and Biology·Francesco De GaetanoMaria Laura Costantino
Jan 18, 2006·Journal of the American College of Cardiology·Shahbudin H Rahimtoola
May 9, 2006·The Journal of Thoracic and Cardiovascular Surgery·Gino GerosaTomaso Bottio
Mar 3, 2006·Expert Review of Cardiovascular Therapy·Bruce W Andrus, Daniel J O'Rourke
Jan 4, 2019·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Tatsuya SekiYoshiro Matsui
Dec 23, 2015·The International Journal of Artificial Organs·Francesco De GaetanoMaria Laura Costantino
May 27, 2010·Scandinavian Journal of Surgery : SJS : Official Organ for the Finnish Surgical Society and the Scandinavian Surgical Society·M Zhang, Q-C Wu
Apr 5, 2021·Materials Science & Engineering. C, Materials for Biological Applications·Sugat Ratna TuladharGino Gerosa

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