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
PEER REVIEWED
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).
| 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 |