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Clinical decision support rules play a key role in the overall delivery of CDS. CDS rules typically follow a common pattern, which has been modeled in several healthcare standards formalisms. The Event-Condition-Action

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http://hl7.org/fhir/2016Sep/cqif/cqif-knowledge-artifact-representation.html#event-condition-action-rule

model, as used in the HL7 community, is described below.

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An informal representation or rule template which captures the Event-Condition-Action pattern is shown below. This pattern can be read as "ON event IF condition THEN action".

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Event-Condition-Action rule template

Rules may reference both EHR data and reference data such as terminology to determine whether or not a specific condition is true. This topic will be explored in more detail in section 4. Inference Engine.

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