<unk><unk>  is critical prior to performance of transcatheter aortic valve implant (TAVI). TAVI candidates must have severe aortic stenosis with a contraindication(s) to surgery.  The<unk> s selected for this procedure should have a potential for functional improvement after valve replacement.<unk>  criteria depend on thorough evaluation of the aortic valve, mitral valve, ejection fraction, vascular access and coronary angiography.  A thorough echocardiographic evaluation of the aortic valve is necessary to determine the valve area, calcification, peak velocity, the transvalvular gradient and aortic annulus size. Aortic incompetence should be assessed as well since more than moderate aortic incompetence before the procedure is a contraindication for TAVI.  Tortuosity, calcification and minimal luminal diameter of the aorta, iliac and femoral arteries would also influence<unk><unk>  and the technical approach used during the procedure.<unk>  potential candidates should be assessed for AS symptoms and severity, baseline clinical situation, cardiac comorbidities and non-cardiac comorbidities. In addition functional assessment is a key step for<unk>  evaluation.
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