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Mar 17, 2017

Few Patients with Resistant Hypertension Take Medication as Instructed

Poor medication adherence influences findings on a novel treatment for persistent high blood pressure.

Poor medication adherence may be to blame in many cases of persistent high blood pressure, based on results of a clinical trial testing a novel therapy for resistant hypertension.

Published in JAMA Hypertension, this study looked at the impact of medication adherence on a treatment for resistant hypertension called renal denervation.

Renal denervation is a minimally-invasive procedure that sends radiofrequency energy to the renal arteries, which supply the kidneys with blood. This procedure is used as a last resort for patients with resistant hypertension who don’t respond to blood pressure-lowering medication. However, renal denervation is still relatively new and findings on its ability to treat hypertension are inconsistent.

To learn more, researchers conducted the SYMPATHY trial, which included 139 Dutch patients with resistant hypertension. Between 2013 and 2016, 95 patients were randomly assigned to receive renal denervation, while 44 received usual care. Patients were followed for six months, during which time researchers tracked both blood pressure and medication adherence. Although patients were unaware that medication adherence was being monitored, it was tracked using blood tests that detect levels of medication in the blood.

Based on results, an estimated 80% of patients had poor medication adherence throughout the study period. After analysis, researchers found that success of the renal denervation procedure depended on whether patients took their medications or not. For example, among all patients, those in the control group actually had lower blood pressure at six months than those receiving renal denervation. However, renal denervation appeared to lower blood pressure when analyzing data from patients who took their medications consistently.

Authors also note that nearly one-third of patients fluctuated with medication adherence throughout the study period.

What this study shows, according to experts, is that medication adherence is extremely poor among patients with resistant hypertension, especially when patients don’t know they’re being monitored. Findings also suggest that changes in medication adherence are common and could interfere with study outcomes. As a result, experts encourage the use of blood tests to track medication adherence in clinical trials. Authors also highlight the need for better medication adherence in patients with resistant hypertension, as poor medication adherence can negatively impact outcomes.

Questions for You to Consider

  • What is a healthy blood pressure?

  • For adults, a healthy blood pressure is less than 120/80 mmHg. Blood pressure is considered elevated between 120–139 mmHg systolic (top number) or between 80–89 mmHg diastolic. Chronic high blood pressure, known as hypertension, occurs when systolic blood pressure is more than 140 mmHg or the diastolic systolic blood pressure is more than 90 mmHg.
  • Who is at risk for high blood pressure?
  • Risk for hypertension increases with age, and most adults will eventually be affected by this condition at some time in their lives. However, diabetes, obesity, stress, high sodium intake, tobacco use and excessive alcohol use can greatly increase risk for high blood pressure.

Featured Video

Hypertension is another way to say "high blood pressure." A patient has hypertension if their readings are above 140 over 90. With medication, the right diet, and a few lifestyle changes, however, hypertension can be managed.


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