A method of replacing a native cardiac valve with a prosthetic cardiac valve the method comprising: expanding a wire mesh scaffolding in a chamber of the heart on a retrograde side of the native cardiac valve while the scaffolding is expanded on the retrograde side of the valve positioning the prosthetic cardiac valve at the site of the native cardiac valve expanding the prosthetic cardiac valve to replace the native cardiac valve and collapsing the scaffolding to a collapsed state and removing the collapsed scaffolding from the chamber of the heart.
