Clinical outcome of high-risk patients with severe aortic stenosis and reduced left ventricular ejection fraction undergoing medical treatment or TAVI. oleh Thomas Pilgrim, Peter Wenaweser, Fabienne Meuli, Christoph Huber, Stefan Stortecky, Christian Seiler, Stephan Zbinden, Bernhard Meier, Thierry Carrel, Stephan Windecker