Research Article

Identification and Progression of Heart Disease Risk Factors in Diabetic Patients from Longitudinal Electronic Health Records

Table 7

Examples of rules used in HDRFSystem components.

ComponentNumber of rulesExamples

Medication recognition12If the medication identified by MetaMap is from RxNorm terminology, assign risk factor with identified medication name.
If the medications identified by MetaMap include abbreviations from custom abbreviations dictionary, assign medication risk factor with full medication name.

Disease disorder recognition22If the disease identified by MetaMap is from SNOMED CT terminology and is either CAD or obesity or diabetes or hypertension or hyperlipidemia, assign risk factor with identified disease name.
If annotated text is identified by blood pressure lab value extractor and diastolic >90 or systolic >140, assign risk factor = “hypertension.”

Family history05If a sentence contains “cad” or “coronary artery disease” and contains “father,” “mother,” or brother, assign sentence as family history sentence.
If family history sentence contains age of death and age <45, assign family history = “present” or else “unknown.”

Smoking history07If a sentence contains terms from custom smoking terms dictionary, assign sentence as smoking history sentence.
If document does not contain smoking terms, assign smoking history = “unknown.”

Sectionizer04If a sentence is classified as “text” but contains terms from custom section headings dictionary, assign label “section heading.”
If a sentence is classified as “section heading with text” and contains “:”, extract text before “:” to obtain section information.

Indicator attribute assigner26If annotated text is identified by MetaMap, assign attribute = “mention.”
If annotated text is identified by blood pressure lab value extractor and diastolic >140 or systolic >90, assign indicator attribute = “high BP.”

Time attribute assigner01If time attribute assigner assigned class is “continuing,” assign time attributes = “before DCT,” “after DCT,” and “during DCT.”