The Very Old Intensive Care Patient: A Multinational Prospective Observation Study

* The primary aim is to document the incidence and short-term outcome of the elderly ICU patient (≥ 80 years) using a multicentre, multi national approach * The secondary aim is to investigate the properties of a simple frailty index in this cohort, and in particular if this is an instrument that can be used in resource and outcome prediction in this group * To create hypothesis for further studies, in particular on various outcome prediction