caa a22 4500 475791681 CHVBK 20180406123712.0 cr unu---uuuuu 170329e20001001xx s 000 0 eng 10.1023/A:1026521211249 doi (NATIONALLICENCE)springer-10.1023/A:1026521211249 Stentless bioprostheses have ideal haemodynamics, even in the small aortic root [Elektronische Daten] [Leo Baur, Yvon Houdas, Kathinka Peels, Jerry Braun, Bart van Straten, Alain Prat, Arie Kappetein, Mariken Wolters-Geldoff, Ernst van der Wall, Albert Bruschke, Hans Huysmans] Objective: To determine normal Doppler and 2D gradients and flow characteristics of the Freestyle® stentless aortic bioprosthesis related to valve size. Background: The Freestyle® stentless aortic bioprosthesis is one of the newer aortic xenografts. Only limited data are available of the echocardiographic flow characteristics during a mid-term follow-up period of this valve. Therefore valve performance related to valve size was measured during a follow-up period of two years. Methods: 175 consecutive patients with a Freestyle® aortic bioprosthesis underwent an echocardiographic and Doppler examination according to a common protocol. Investigations were done within 4 weeks after operation, after 3 to 6 months, and after 1 and 2 years. Results: With a valve size from 19 to 27 mm mean gradients decreased from 8.0 ± 5.1 mmHg at discharge to 5.8 ± 3.8 mmHg after 3-6 months (p < 0.001). Thereafter gradients remained stable. The performance index, the ratio of the measured effective orifice area in the patient divided by the effective orifice area measured in vitro increased from 69 ± 20% at discharge to 79 ± 29% after one, two and three years. Performance index was especially very high in the smaller sized valves with a performance index of 85 ± 17% for the 21 mm valve. During follow-up mean gradients remained below 10 mmHg even in the 21 mm valve. Conclusion: Stentless xenografts have ideal haemodynamics, even in the small aortic root. Kluwer Academic Publishers, 2000 anticoagulation nationallicence aortic valve nationallicence haemodynamics nationallicence mechanical valve nationallicence stentless bioprostheses nationallicence Baur Leo Atrium Medical Centre, Heerlen, the Netherlands aut Houdas Yvon Hopital Universitaire Lille, France aut Peels Kathinka Catharina Hospital Eindhoven, the Netherlands aut Braun Jerry Leiden University Medical Centre, the Netherlands aut van Straten Bart Catharina Hospital Eindhoven, the Netherlands aut Prat Alain Hopital Universitaire Lille, France aut Kappetein Arie Leiden University Medical Centre, the Netherlands aut Wolters-Geldoff Mariken Leiden University Medical Centre, the Netherlands aut van der Wall Ernst Leiden University Medical Centre, the Netherlands aut Bruschke Albert Leiden University Medical Centre, the Netherlands aut Huysmans Hans Leiden University Medical Centre, the Netherlands aut The International Journal of Cardiac Imaging Kluwer Academic Publishers 16/5(2000-10-01), 359-364 0167-9899 16:5<359 2000 16 10554 https://doi.org/10.1023/A:1026521211249 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1026521211249 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Baur Leo Atrium Medical Centre, Heerlen, the Netherlands aut NATIONALLICENCE 700 1- Houdas Yvon Hopital Universitaire Lille, France aut NATIONALLICENCE 700 1- Peels Kathinka Catharina Hospital Eindhoven, the Netherlands aut NATIONALLICENCE 700 1- Braun Jerry Leiden University Medical Centre, the Netherlands aut NATIONALLICENCE 700 1- van Straten Bart Catharina Hospital Eindhoven, the Netherlands aut NATIONALLICENCE 700 1- Prat Alain Hopital Universitaire Lille, France aut NATIONALLICENCE 700 1- Kappetein Arie Leiden University Medical Centre, the Netherlands aut NATIONALLICENCE 700 1- Wolters-Geldoff Mariken Leiden University Medical Centre, the Netherlands aut NATIONALLICENCE 700 1- van der Wall Ernst Leiden University Medical Centre, the Netherlands aut NATIONALLICENCE 700 1- Bruschke Albert Leiden University Medical Centre, the Netherlands aut NATIONALLICENCE 700 1- Huysmans Hans Leiden University Medical Centre, the Netherlands aut NATIONALLICENCE 773 0- The International Journal of Cardiac Imaging Kluwer Academic Publishers 16/5(2000-10-01), 359-364 0167-9899 16:5<359 2000 16 10554 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer