Contributions Paul Sorajja, MD, FSCAISCAI Position Statement on Best Practices for Clinical Proctoring of New Technologies and Techniques Paul Sorajja, MD, FSCAITranscatheter Aortic Valve Replacement in Patients With Severe Comorbidities: A Retrospective Cohort Study Paul Sorajja, MD, FSCAISCAI/HFSA Clinical Expert Consensus Document on the Use of Invasive Hemodynamics for the Diagnosis and Management of Cardiovascular Disease Paul Sorajja, MD, FSCAIOptimal Use of Left Ventriculography at the Time of Cardiac Catheterization Paul Sorajja, MD, FSCAIAd Hoc Percutaneous Coronary Intervention