Results of a clinical trial announced today at the American College of Cardiology Annual Scientific Session show a new type of therapy is safe and effective for symptomatic advanced heart failure patients who are already receiving optimum drug and device therapy. The study also published in the Journal of the American College of Cardiology Heart Failure.
The research team led by Dr. William Abraham, director of the Division of Cardiovascular Medicine at The Ohio State University Wexner Medical Center, tested whether carotid baroreflex activation therapy (BAT) could safely improve symptoms, exercise capacity and quality of life in patients with NYHA Class III heart failure.
"Heart failure patients experience an imbalance in their autonomic nervous system, which plays a role in disease progression and leads to adverse effects on the heart, blood vessels and kidneys," Abraham said. "Currently, the optimum drug therapy available is not enough to restore balance for some patients, leaving them highly symptomatic, with reduced quality of life. BAT could prove to be an effective added therapy that can help patients feel better."
BAT is electrical stimulation delivered by an implanted device, similar to a cardiac pacemaker. The tested device from CVRx Inc. has a carotid sinus lead and a pulse generator. Stimulation of the carotid baroreceptor is currently used to treat hypertension that is resistant to drug therapy.
This study enrolled 146 patients with NYHA Class III heart failure and a left ventricular ejection fraction of 35 percent or less at 45 centers in the United States, Canada and Europe. All participants were on guideline-directed medical therapy. The control group of 70 patients received medical therapy alone, while the treatment group of 76 patients received BAT and medical therapy.
After six months, researchers reassessed all of the patients for NYHA Class, quality of life using the Minnesota Living with Heart Failure Questionnaire and exercise capacity using a standardized six-minute hall walk test. Among those assigned to BAT, more than half improved at least one NYHA Class, compared to just a fourth of the control group. The treatment group also reported improved quality of life scores and walked approximately 60 meters farther in six minutes, compared to the control group. Researchers also noted favorable changes in biomarkers among those treated with BAT.
The team reported the device was safely implanted with few complications and no adverse effects. The risk of unfavorable cardiovascular or neurological events over the six-month trial period was the same as similar device-based therapies.
"This is promising news for the nearly 5 million Americans living with heart failure," Abraham said. "If these findings are confirmed in larger studies, BAT could be a new option for treating advanced stages of the disease."
While it was not intended to evaluate clinical outcomes, Abraham says results from this study support the notion that BAT can reduce heart failure hospitalizations and the number of days hospitalized. However, further research is needed to confirm that.
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