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Transapical mitral valved stent implantation : comparison between circular and D-shaped design
Publikationstyp
Journal Article
Publikationsdatum
2014-07
Sprache
English
Enthalten in
Volume
10
Issue
3
Start Page
372
End Page
380
Citation
EuroIntervention 10 (3): 372-380 (2014)
Publisher DOI
Scopus ID
Publisher
Europa Group
Aims: In this study two designs of a self-expanding valved stent were compared after off-pump implantation into the mitral valve to identify the superior one. Methods and results: Two designs of a mitral valved stent were tested. The first design is composed of a circular atrial element connected to a tube-shaped ventricular element. In the second design, the atrial element is D-shaped to achieve better anatomical alignment. Prior to in vivo testing, the area with the highest risk of PVL was identified in a hydrostatic in vitro set-up. Subsequently, eight pigs received stents (circular, n=5; D-shaped, n=3) via apical access in the beating heart. Positioning and haemodynamics were evaluated by TEE and invasive pressure measurement pre-implantation, after 1 hr, and at two and four weeks. In vitro testing showed less PVL in the anteromedial region in D-shaped design stents (p<0.001). All stents were successfully deployed in vivo and six animals maintained normal haemodynamics for two weeks or longer. Rotational reorientation of all stents with D-shaped elements was observed. Both groups indicated no clinically relevant gradients over the mitral valved stent. Conclusions: This study demonstrates that the circular design was superior to the D-shaped model after rotational reorientation of the latter occurred.
Schlagworte
Design
Mitral
Mitral valve
Off-pump
Stent
Transapical
Valved stent
DDC Class
610: Medicine, Health
620: Engineering