I can see all manner of conflicts. As we are in the hands of our cardiologists and it is them who more or less decide when it is time for us to move forward for surgery then the longer they hold onto us the higher risk we will become then they can hang onto us. I don't like that idea.
As ClickerTicker said, presumably it will have to be done somewhere that has the facilities to open you up should the need arise. That would rule out my local hospital, hopefully, if they think you might need OHS urgently they pop you in a 'plane and fly you to England. I don't want heroics from my local cardiologist, I want the right treatment at the right time with the correct backup facilities.