The concept of frailty in intensive care.

Our population is ageing, and this is also reflected in the ageing of the hospital and intensive care population. Along with ageing, there is also an increase in age-related chronic health conditions or comorbidities, which in turn affects the patient's functional state. There is an increasing need to describe a patient's clinical condition in terms of their functional capacity, such as frailty. Frailty is an age-related syndrome which reduces physiological and cognitive reserves. As a result, frailty increases people's vulnerability to insults such as infection and trauma. The concept of frailty also indicates prognosis and levels of health from a patient's perspective rather than simply from the acute reason for admission to the intensive care unit. Understanding the concept of frailty may facilitate our awareness of long-term outcomes after intensive care and being a trigger for considering its prognostic implications and the need to honestly and empathetically begin discussions with patients and their carers and how the patient's own goals of care could be established around this information.