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Assessment of Vascular Function in Patients With Chronic Kidney Disease
Published on: June 16, 2014
Low medication adherence and hypertension control among adults with CKD: data from the REGARDS (Reasons for
Paul Muntner1, Suzanne E Judd, Marie Krousel-Wood
1Department of Epidemiology, University of Alabama at Birmingham, Birmingham, AL 35294, USA. pmuntner@uab.edu
Insights
Medication adherence in chronic kidney disease (CKD) is similar to the general population. Poor adherence to blood pressure medication is linked to uncontrolled hypertension in CKD patients.
Area of Science:
- Nephrology
- Cardiology
- Public Health
Background:
- Low adherence to antihypertensive medication is a significant obstacle to blood pressure control.
- Limited data exist on medication adherence specifically in adults with chronic kidney disease (CKD).
Purpose of the Study:
- To investigate medication adherence and its association with uncontrolled hypertension in adults with CKD.
- To compare medication-taking behaviors between individuals with and without CKD.
Main Methods:
- A cross-sectional study utilizing data from the REGARDS (Reasons for Geographic and Racial Differences in Stroke) Study.
- Included 3,936 participants with CKD and 9,129 without CKD, all using antihypertensive medication.
- CKD defined by albuminuria or estimated glomerular filtration rate. Medication adherence assessed via a 4-item scale; blood pressure measured twice.
Main Results:
- Uncontrolled hypertension (BP ≥140/90 mm Hg) was prevalent in 36.2% of CKD participants and 26.5% without CKD.
- Similar proportions of participants with and without CKD reported forgetting medications (27.7% vs. 27.9%) or being careless (4.4% vs. 4.2%).
- In CKD patients, adherence issues (1 or more adherence questions) were associated with increased odds of uncontrolled hypertension (ORs 1.26-1.49 for BP ≥140/90 mm Hg).
Conclusions:
- Individuals with CKD exhibit medication-taking behaviors comparable to those without CKD.
- Poor medication adherence is a significant factor contributing to uncontrolled hypertension in the CKD population.
- Pharmacy fill data were not available for this analysis.
Background:
Low adherence to antihypertensive medication is an important barrier to achieving blood pressure control. Few data are available for medication adherence in adults with chronic kidney disease (CKD).
Study Design:
Cross-sectional.
Setting & Participants:
3,936 and 9,129 participants with and without CKD using antihypertensive medication in the REGARDS (Reasons for Geographic and Racial Differences in Stroke) Study, respectively. CKD was defined as albuminuria with albumin excretion>or=30 mg/g or estimated glomerular filtration rate<60 mL/min/1.73 m2.
Outcomes:
Medication adherence and uncontrolled hypertension.
Measurements:
Medication adherence was assessed using a validated 4-item scale. Blood pressure was measured 2 times by trained staff.
Results:
In REGARDS participants with and without CKD, 1,426 (36.2%) and 2,421 (26.5%) had uncontrolled hypertension with blood pressure>or=140/90 mm Hg, and 2,656 (67.5%) and 5,627 (61.6%), >or=130/80 mm Hg. Also, 27.7% of those with CKD and 27.9% of those without CKD responded "yes" to ever forgetting to take their medication and 4.4% and 4.2%, respectively, responded yes to being careless about taking their medication. Also, 5.7% and 5.3% responded yes to missing taking medication when they felt better, and 4.2% and 3.6%, to missing it when they felt sick. Overall, 23.3% and 23.7% of participants with and without CKD responded yes to 1 adherence question, whereas 7.7% and 7.2%, respectively, responded yes to 2 or more adherence questions. In those with CKD, the multivariable adjusted ORs for uncontrolled hypertension (blood pressure>or=140/90 mm Hg) for individuals answering yes to 1 and 2 or more versus 0 adherence questions were 1.26 (95% CI, 1.05-1.51) and 1.49 (95% CI, 1.12-1.98), respectively. Analogous ORs for systolic/diastolic blood pressure>or=130/80 mm Hg were 1.06 (95% CI, 0.78-1.45) and 1.20 (95% CI, 0.88-1.64).
Limitations:
Pharmacy fill data were not available.
Conclusions:
Individuals with CKD had similarly poor medication-taking behaviors as those without CKD.
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