Machine learning methods are becoming increasingly popular to anticipate critical risks in patients under surveillance thus reducing the burden on caregivers. In this paper, we propose an original modelling that benefits of recent developments in Graph Convolutional Networks: a patient's journey is seen as a graph, where each node is an event and temporal proximities are represented by weighted directed edges. We evaluated this model to predict death at 24 hours on a real dataset and successfully compared our results with the state of the art.