This paper discusses the concept of Psychiatric Register Integrated Support Modules (PRISM). It addresses issues around the linkage of longitudinal data held on individual patients in case register systems to expert and other decision support systems. The paper describes two developed systems which link to the SafetyNet case register system, an inexpensive and comprehensive Mental Health Information System which runs on single or networked computers and which was previously described in detail (Taylor & Bhumgara, 1989). The merits of the two approaches in aiding clinical decision making on anti-psychotic medication are discussed as are the medico-legal implications of using expert systems.
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