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atrial fibrillation af bronchoscopy mortality digitalis digoxin vq scan thallium scan myocardial viability viability scan pet spect nuclear cardiology arrythmias lung cancer superior vena cava syndrome svc syndrome svc obstruction cardiothoracic surgery cardiac surgery interventional cardiology aortic stenosis partner trial savr transcatheter aortic valve implantation tavi anatomy surgical anatomy av valves tricuspid valve mitral valve interventional bronchoscopy tracheobronchial tree bronchus trachea thoracic surgery