New issues in severity scoring: interfacing the ICU and evaluating it.

Since the development of the first general outcome prediction models, these instruments have been widely used in the intensive care unit (ICU), both for patient evaluation and for ICU evaluation. Since some of these uses have been serious questioned, we assisted in the last years to the exploration of alternative paths for increasing the predictive power of the models and to enhance their applicability and utility in the real world. Part of these efforts focused on the exploration of more meaningful outcomes (clinical and non-clinical) with a strong tonic into the relation between outcomes and resources use. Also, since it is now widely recognized that the ICU is not an island, but it is integrated in a continuum of care, more and more efforts are being made to optimize and evaluate the interface between the ICU and the hospital, both at ICU admission and at ICU discharge. The objective of this review is to present and discuss, to the clinician working in the ICU, these emerging issues.