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Meditra NTS inner workings

We recently received requests about the inner workings of the Meditra Triage application. Especially about its unique feature to allow fuzzy input to be used and its relation to the underlying non-fuzzy triage protocol.  Although the details are subject to non-disclosure, for most purposes the explanation below might suffice.
nts-normaal
In the Meditra application the NTS triage criteria are expressed as rules (logical conjunctions) consisting of one or more factor-value combination as the antecedent and an urgency value as the consequent.

The triagist’s input is compared to the full set of rules to determine the resulting urgency. Since the appliation’s user interface allows to express more factor-value combination that are literally present in the ruleset, Mamdani fuzzy inference is used to transform the user input to a firering strength of each involved rule. Within the context of a complaint (ingangsklacht) the resulting fuzzy set of urgencies are defuzzified using defensive robust constraint decision defuzzification.

This strategy allows to evaluate the user input over all complaints and therefore may yield more than one urgency value (one for each complaint). To derive the single resulting urgency value, also a defensive approach is taken as the complaint yielding the highest (most urgent) urgency is assigned to be the “defining complaint” and its urgency the “current urgency”. Once the ruleset of the defining complaint contains no more rules of which the antecedent is a higher urgency class that the current urgency, the current urgency is assigned to be the “final urgency” and the strategy terminates.

For more information, don’t hesitate to contact us directly.