In this section we present a number of examples of CDS rules, using the 'ON event IF condition THEN action' pattern described in section 3.1. Rules.
Asthma Diagnosis
This simple CDS rule was designed to be used during a clinical encounter. If the patient is diagnosed with asthma, the appropriate management guidelines are automatically displayed on the clinician's workstation.
Figure 3.1.3-1: This rule demonstrates the use of a single event, criterion, and action, an expression constraint in the criterion value, and use of the default context.
Medication Order
This rule has been designed to be used when ordering a medication. If the patient is 77386006 | Pregnant| and the drug has an active ingredient of 372756006 | Warfarin| , the clinician will be alerted and the CDSS will suggest an alternative blood thinner which does not pose a risk for expectant mothers.
Figure 3.1.3-2: This rule demonstrates the use of multiple criteria, multiple actions, expression constraints in the criterion value, and use of the default context.
Emergency DepartmentThe following example is a CDS rule designed to be used in an Emergency Department setting, when a patient has presented in the ER with chest pain. In this scenario, the attending physician may order a 312468003 | Blood potassium measurement| . If the patient is currently taking a medication with an active ingredient of 387461009 | Digoxin| , and the lab result is published indicating that the patient's potassium level is less than 3.0 mmol/L, the attending physician will be paged.
Table 3.1.3-1: This rule demonstrates the use of multiple criteria, expression constraints in the criterion value, a non-coded criterion with a mathematical operator, and use of the default context.
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