Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-20715
Kempfert, J; Blumenstein, J; Chu, M W A; Pritzwald-Stegmann, P; Kobilke, T; Falk, V; Mohr, F W; Walther, T (2009). Minimally invasive off-pump valve-in-a-ring implantation: the atrial transcatheter approach for re-operative mitral valve replacement after failed repair. European Journal of Cardio-Thoracic Surgery, 35(6):965-969.
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OBJECTIVE: Based upon recent developments in transcatheter technology, this study was designed to evaluate the feasibility and haemodynamic performance of transcatheter valve-in-a-ring (VinR) implantation for potentially failed mitral repair using a minimally invasive, transatrial, off-pump approach. METHODS: Adult sheep (54.3+/-3.0 kg) underwent mitral valve repair with a 26 mm complete annuloplasty ring (Physio) using standard conventional techniques. To simulate the redo operation, a transcatheter 23 mm pericardial prosthesis (Edwards Sapien) mounted on a balloon-inflatable steel stent was deployed within the annuloplasty ring. VinR implantation was performed off-pump under rapid pacing in four and on-pump in three animals using an antegrade transatrial approach under fluoroscopic guidance. RESULTS: Transcatheter VinR implantation was successful in all seven sheep. Mean transvalvular gradient was 4.9+/-0.3 mmHg. VinR function was excellent with no leak in one, good with mild leak in five (trans-stent: four, paravalvular: one) and sufficient with moderate central leak in one animal, respectively. Valve deployment required 10.0+/-0.7 min and all transcatheter prostheses were confirmed in good position on postmortem analysis, without any signs of valve dislocation or embolisation. In an in-vitro model, the minimum force required to dislodge the valve was 32.9+/-5.2N, which was well above the normal estimated forces generated by the left ventricle. One animal was kept alive to assess mid-term outcome and is still well 12 months after the VinR implantation. CONCLUSIONS: Transatrial, transcatheter mitral VinR implantation is feasible using a minimally invasive off-pump approach. VinR implantation is a promising concept for re-operative surgery for selected patients after failed mitral valve repair.
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|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||04 Faculty of Medicine > University Hospital Zurich > Clinic for Cardiovascular Surgery|
|DDC:||610 Medicine & health|
|Deposited On:||29 Sep 2009 13:10|
|Last Modified:||27 Nov 2013 23:00|
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