BACKGROUND.- The frailty syndrome (FS) associates an increase in morbidity and mortality in the elderly patient. When severe and symptomatic, aortic stenosis (AS) is a disease with poor prognosis, the most frequent cause of heart surgery in the elderly and associates high health costs. No variables have been identified as determinants of morbidity and mortality of these patients and there are not algorithms developed for treatment decision-making in this particular population. The FS as a functional reserve indicator could be a prognostic and interventional treatment tolerance marker, and should be included in the selection of patients for surgical treatment. The FS and cardiovascular disease (CVD) share biological substrates among which an inflammatory state associates poor prognosis.