1. Apparatus for displaying a graphical representation of a patient's condition as measured by n parameters, where n>3, comprising a processor which maps data points represented by said n parameters from an n-dimensional measurement space into an m-dimensional visualisation space, where m<n, using a dimensionality reduction mapping, and a display which displays the visualisation space and the data points mapped into it, and which is adapted to the display of dynamically changing values of said parameters by means of the mapping being carried out by a trained artificial neural network.