Compiling Causal Knowledge for Diagnostic Reasoning
The use of causality as a pivotal mechanism in diagnostic reasoning was first explored in the CASNET/glaucoma program.4 The causal knowledge in CASNET is represented as a network of pathophysiologic states that correspond to specific physiologic dysfunctions (not complete diseases), a set of tests that provide evidence about the likelihood of existence of those states in a given patient, and causal links between states, with subjective assessments of the transition probabilities from one state to the next. Each disease is described as a possible pattern of causally related states. Diagnosis is carried out by testing for the existence of individual pathophysiologic states, followed by matching the observed pattern of states against the patterns described for various diseases.
KeywordsHydration Diarrhea Dehydration Bicarbonate Posite
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