Evaluating Control of Hypertension - Effect of Social Determinants
- Conditions
- Hypertension
- Interventions
- Other: Medicaid Expansion
- Registration Number
- NCT03545763
- Lead Sponsor
- Oregon Health and Science University
- Brief Summary
This study evaluates the impact of a large-scale, national expansion of Medicaid on hypertension incidence, screening, treatment, and management. Social Determinants of Health will be assessed as moderators, and comparing states that did versus states that did not expand Medicaid will also be evaluated.
- Detailed Description
The Affordable Care Act (ACA) enacted several provisions intended to improve healthcare for vulnerable populations,including expanding Medicaid eligibility to those earning ≤138% of the federal poverty level (FPL). Since the expansion was not required, as of March 2018, 32 states (and District of Columbia) implemented the expansion and 18 did not. Simulated models predicted the ACA would improve health outcomes and reduce disparities for patients with hypertension, yet actual changes are not yet available. In addition, there is new interest in tracking and utilizing Social Determinants of Health (SDH) in the primary care setting but there is currently little information on how this information will impact Hypertension (HTN) care, especially related to changes to health insurance availability. This study will build on current understanding of how health insurance impacts HTN incidence, screening, treatment, and management by comparing states that did versus did not expand Medicaid as part of the ACA and seeks to understand the influence of SDH on these changes. the investigators will address the following specific aims: Aim 1: Compare HTN incidence, prevalence of undiagnosed HTN, and rates of HTN screening, in Medicaid expansion versus non-expansion states before and after the ACA. Aim 2: Compare HTN treatment (e.g., medication use), and management (e.g., HTN control, systolic and diastolic blood pressure change, risk factors related to HTN control) in Medicaid expansion versus non-expansion states before and after the ACA. Aim 3: Assess the extent to which rates of HTN incidence, screening, and treatment effectiveness among patients who gained insurance versus those continuously insured or uninsured, pre-post ACA, are moderated by individual-level SDH (e.g., race, ethnicity), in expansion states. Aim 4: Explore the interaction between community-level SDH (e.g., neighborhood racial segregation and deprivation) and HTN incidence, screening, treatment, and management among patients who gained insurance relative to those who were continuously insured or uninsured, in expansion states. The findings from this project will be extremely relevant to policy and practice, informing further improvements in the US healthcare system to ensure access to healthcare for vulnerable populations.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 1939783
- Patients in intervention and control states aged 19-64
- Patients outside of age range 19-64
Study & Design
- Study Type
- OBSERVATIONAL
- Study Design
- Not specified
- Arm && Interventions
Group Intervention Description Non Medicaid Expansion States Medicaid Expansion Patients receiving care in community health centers in states that did not expand Medicaid (control group) Medicaid Expansion States Medicaid Expansion Patients receiving care in community health centers in states that expanded Medicaid (intervention group)
- Primary Outcome Measures
Name Time Method Hypertension incidence 24 months prior to Medicaid expansion vs 24 months post Rates of hypertension diagnosis using the following codes in the EHR: ICD-9: 401.00-401.99, 402.00-405.99 or ICD-10: I10-I15.
Hypertension treatment 24 months prior to Medicaid expansion vs 24 months post the number of anti-hypertensive medications prescribed in EHR
Hypertension screening 24 months prior to Medicaid expansion vs 24 months post rate of blood pressure screening marked in EHR
Undiagnosed hypertension 24 months prior to Medicaid expansion vs 24 months post high blood pressure but no diagnosis or medications can be noted in the EHR diagnostic codes that can be used to document why a diagnosis of hypertension was not made including ICD-10 R03.0 (i.e., white coat syndrome without HTN) and ICD-9 796.2 (i.e., elevated BP without HTN).
Hypertension management 24 months prior to Medicaid expansion vs 24 months post blood pressure control: last measure within range of normal for age/risk(s); percent Y/N at last visit, value/date of last measure
- Secondary Outcome Measures
Name Time Method Hypertension related complications 24 months prior to Medicaid expansion vs 24 months post incidence of related complications and diseases derived from EHR data
Insurance status and rates of coverage 24 months prior to Medicaid expansion vs 24 months post Health insurance status derived from EHR data and is primarily based on information collected at each visit
Service Utilization 24 months prior to Medicaid expansion vs 24 months post Type of internal services utilized including number and ratio of "traditional" face to face visits vs. "nontraditional" encounters and communication via phone, personal health record, and email
Preventive service receipt 24 months prior to Medicaid expansion vs 24 months post number of all billed encounters overall and yearly, as well as number of cancer screening, smoking screening, lipid screening, diabetes screening, obesity screening
Trial Locations
- Locations (1)
Oregon Health & Science University
🇺🇸Portland, Oregon, United States