Development of a Hypertension Electronic Phenotype for Chronic Disease Surveillance in Electronic Health Records: Key Analytic Decisions and Their Effects

Katherine H. Hohman

doi:10.5888/pcd20.230026

Development of a Hypertension Electronic Phenotype for Chronic Disease Surveillance in Electronic Health Records: Key Analytic Decisions and Their Effects

ORIGINAL RESEARCH — Volume 20 — September 14, 2023

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Figure. Contribution of 3 criteria for hypertension case definition to an estimated overall hypertension prevalence of 43.4% in Louisiana, 2019. The denominator for estimating prevalence was the population of patients with ≥1 blood pressure measurement in 2018 or 2019 and 3 criteria for hypertension case identification (a combination of ≥1 diagnosis code, 2 elevated blood pressures, and antihypertensive medication). Data source: Research Action for Health Network (REACHnet) (17), operated by the Louisiana Public Health Institute, 1 of the 5 data contributors participating in the Multi-State EHR-Based Network for Disease Surveillance (MENDS) pilot chronic disease surveillance system (11).

Contribution of 3 criteria for hypertension case definition to an estimated overall hypertension prevalence of 43.4% in Louisiana, 2019. The denominator for estimating prevalence was the population of patients with ≥1 blood pressure measurement in 2018 or 2019 and 3 criteria for hypertension case identification (a combination of ≥1 diagnosis code, 2 elevated blood pressures, and antihypertensive medication). Data source: Research Action for Health Network (REACHnet) (17), operated by the Louisiana Public Health Institute, 1 of the 5 data contributors participating in the Multi-State EHR-Based Network for Disease Surveillance (MENDS) pilot chronic disease surveillance system (11).
Criteria	Percentage
Diagnosis code only	20
Elevated blood pressure only	16
Antihypertensive medication only	5
Diagnosis code and elevated blood pressure only	13
Diagnosis code and antihypertensive medication only	19
Elevated blood pressure and antihypertensive medication only	2
Diagnosis code, elevated blood pressure, and antihypertensive medication	25

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