Arden syntax

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Arden syntax is a markup language designed for representing and sharing medical knowledge in a standardized, executable format. It is primarily used by clinical decision support systems to generate alerts, interpretations, and manage information presented to clinicians. This allows for the consistent and efficient application of clinical and scientific knowledge within and across healthcare institutions. The core units of knowledge representation in Arden syntax are Medical Logic Modules (MLMs), which contain the logic necessary to make a single medical decision. These MLMs are triggered by event monitors within clinical systems when specific conditions arise. For example, an MLM might be written to detect a potential drug interaction. It would contain the logic to check if a patient is currently prescribed two medications known to interact negatively. If the conditions are met (i.e., the patient is on both medications), the MLM could trigger an alert to the clinician, providing information about the interaction and suggesting alternative treatments. Another example might be an MLM designed to screen for patients at high risk of a certain condition, such as diabetes. The MLM could analyze patient data (e.g., age, weight, blood pressure) and flag those who meet the risk criteria, prompting further investigation by the clinician. Arden syntax was formerly a standard under ASTM, published in 1992, and is now part of Health Level Seven International (HL7). The version 2.0 was published by HL7 in 1999, and version 3.0 in October 2023.