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Intensifying therapy for hypertension despite suboptimal adherence
Adam J Rose1, Dan R Berlowitz, Meredith Manze
1Center for Health Quality, Outcomes, and Economic Research, Boston University School of Medicine, 200 Springs Road, Bedford, MA 01730, USA. adamrose@bu.edu
Insights
Intensifying treatment for high blood pressure (BP) effectively lowers systolic BP regardless of patient adherence. This study suggests treatment intensification benefits all patients, even those with poor adherence.
Area of Science:
- Cardiovascular Medicine
- Clinical Pharmacy
- Hypertension Management
Background:
- Effective blood pressure (BP) control is crucial for hypertensive patients.
- Suboptimal patient adherence often complicates treatment intensification (TI) strategies.
- The impact of TI on BP outcomes in relation to adherence levels requires further investigation.
Purpose of the Study:
- To determine if the effect of treatment intensification on blood pressure varies by patient adherence.
- To analyze the association between TI and final systolic blood pressure (SBP) across different adherence quartiles.
Main Methods:
- Observational study of 819 hypertensive patients in primary care.
- Treatment intensification (TI) calculated as (medication changes - elevated BP visits) / total visits.
- Adherence measured using MEMS caps; patients grouped into adherence quartiles or 'missing' adherence.
Main Results:
- Overall, each additional TI per 10 visits predicted a 2.0 mm Hg decrease in final SBP (P<0.001).
- SBP reduction associated with TI was consistent across all adherence levels, ranging from 1.6 to 2.4 mm Hg.
- No statistically significant differences in BP reduction were observed between adherence groups.
Conclusions:
- Treatment intensification is associated with similar blood pressure improvements irrespective of patient adherence levels.
- Further randomized trials are recommended to confirm optimal management strategies for patients with suboptimal adherence.
Abstract:
More intensive management can improve control blood pressure (BP) in hypertensive patients. However, many would posit that treatment intensification (TI) is not beneficial in the face of suboptimal adherence. We investigated whether the effect of TI on BP varies by adherence. We enrolled 819 patients with hypertension, managed in primary care at an academically-affiliated inner-city hospital. We used the following formula to characterize TI: (visits with a medication change-visits with elevated BP)/total visits. Adherence was characterized using electronic monitoring devices ("MEMS caps"). Patients who returned their MEMS caps (671) were divided into quartiles of adherence, whereas patients who did not return their MEMS caps (148) had "missing" adherence. We examined the relationship between TI and the final systolic blood pressure (SBP), controlling for patient-level covariates. In the entire sample, each additional therapy increase per 10 visits predicted a 2.0 mm Hg decrease in final SBP (P<0.001). After stratifying by adherence, in the "best" adherence quartile each therapy increase predicted a 2.1-mm Hg decrease in final SBP, followed by 1.8 for the "next-best" adherence quartile, 2.3 in the third quartile, and 2.4 in the "worst" adherence quartile. The effect size for patients with "missing" adherence was 1.6 mm Hg. The differences between the group with "best" adherence and the other 4 groups were not statistically significant. In this observational study, treatment intensification was associated with similar BP improvement regardless of the patient's level of adherence. A randomized trial could further examine optimal management of patients with suboptimal adherence.
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