An "NATEX" expert system has been designed, which is intended to support a neonatologist's diagnostic decision making at the first stage of neonatal nursing. While designing the expert system, the authors used the shell "REPROCODE" wherein medical knowledge is presented as hierarchical semantic threshold network with shared attribute space. The designed system is realized on the basis of an IBM PC XT/AT, its operation requires only the processor 80286 and the operating system MS DOS 3.0 or higher. The "NATEX" expert system is employed to diagnose major syndromes of neonatal diseases. The knowledge base of the "NATEX" system has an account of 33 syndromes of neonatal diseases and, with various forms of severities borne in mind, the total number of diagnosed conditions in a baby is 63. In terms of content, it covers all major syndromes assessing the vital systems of the neonatal body and their occurring processes. The total number of symptoms which are necessary and sufficient for making a diagnostic decision as realization of either syndromes is 700.
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