1. A patient physiological information monitoring system, comprising: a plurality of patient monitoring devices that monitor physiological information from a patient and generate corresponding physiological signals; and a physiological information analyzer that processes the monitored physiological information and determines whether a physiological change is a clinically significant event or an artifact, the physiological information analyzer including: at least one receiver that receives the physiological signals from the patient monitoring devices; a signal correlator that generates morphograms from pairs of the received physiological signals; a signature generator that applies a wavelet decomposition to each morphogram to compute a signature for each morphogram; and a decision component that compares the morphogram signatures within and across sampling intervals and determines if a physiological change is a clinically significant change or an artifact.