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This paper proposes a ubiquitous patient-monitoring system using mobile devices, in which all communications are based on the use of wireless technology. The most salient features of the system are: 1) its multi-purpose nature - the architecture has been conceived so that the device can be configured to monitor patients with different illnesses; 2) the organisation of the physiological signal processing through a layout of processing levels structured into modules which can be incorporated and substituted in a simple manner, facilitating the reconfiguration of the monitoring functions; and 3) the use of techniques from the field of Artificial Intelligence to provide information closer to the decision-making process of medical specialists.