<qa>  What is the most common valve disease among the adult population?Aortic stenosis AS is the most common valve disease among the adult population, in the majority of the cases it only requires treatment in advanced age. Surgical aortic valve replacement SAVR is very often refused because of advanced age and poor general condition. These patients used to receive only medical treatment which is less favorable compared to SAVR. Nowadays transcatheter aortic valve implantation TAVI has become available as an alternative treatment for very high risk or even inoperable patients who are suffering from symptomatic aortic stenosis 1. Between 2012 and 2014 TAVI has been used extensively, accumulating over 100,000 procedures performed worldwide since 2002 2. TAVI was originally developed for those patients who were considered too frail to undergo SAVR 3. Recently, we are able to perform TAVI in almost all patients with high procedure success rate and achieve good hemodynamic results. Despite these promising results, the one year outcome is not so evident. Until now it has been learnt that there are a group of patients who are in a very bad condition and who are so frail that they do not benefit from TAVI. These patients have worse survival rate and more importantly poor quality of life in spite of a successful procedure. Cardiac surgery risk scores like Society of Thoracic surgery score STS and EUROSCORE are less accurate in aging high risk people 4. Advanced age is often accompanied with frail general conditions and, the estimated morbidity and mortality values do not correlate well with the postoperative outcomes. In these risk scores very important relevant factors like frailty and disability are not taken into account. In elderly it is principal to make differentiation between utility and futility. Frailty is a clinical syndrome that reflects impaired physiologic reserve and increased vulnerability to stressors 5. However frailty as a geriatric concept has existed for a long time, its importance has recently gained high priority in the concept of older adults especially who undergo TAVI1. By today frailty scores have increasing importance and are used more frequently by several investigators. Slow 5m gait speed has evidently proven unfavorable outcomes 6, 7, other frailty assessment tools like handgrip strength test, activities of daily living ADL, instrumental activities of daily living iADL, nutritional assessment, mini-mental status, etc. has been being investigated continuously. 