Baroloop Multicenter Trial (Baroloop MCT)

This trial is testing a small device called the Baroloop, which is placed around a nerve in the neck to help lower blood pressure in people whose high blood pressure hasn't responded to medication. **You may be eligible if...** - You are 18 or older - Your blood pressure is still high (140/90 or above) even while taking 3 blood pressure medications - You have been on a stable combination of an ACE inhibitor or ARB, a calcium channel blocker, and a diuretic for at least 4 weeks - Your 24-hour blood pressure monitor confirms high blood pressure **You may NOT be eligible if...** - You have a pacemaker or implanted defibrillator - You have had neck surgery, radiation to the neck, or significant scarring in the neck area - You have had a stroke or mini-stroke in the past 6 months - Your BMI is above 40 or you have severe blockage in your carotid arteries - You have severe heart failure, untreated sleep apnea, or poorly controlled type 2 diabetes - You are pregnant - You already have a vagus nerve stimulator - Your resting heart rate is below 45 beats per minute Talk to your doctor to see if this trial is right for you.