This study is testing if a special new **heart pacemaker** can help control blood pressure. The pacemaker is a machine that helps your heart beat regularly. The study will last for **3 years** and has three parts: screening, one year of testing, and two years of observation. You can join if you already have or need a Medtronic Astra/Azure pacemaker and have high blood pressure that won't go down with medicine. You will keep taking your blood pressure medicine during the study. Some people will have the new pacemaker feature turned on, and others will have it off. Everyone will be chosen randomly to be in one of these two groups. Before joining, make sure you don't have certain health conditions like severe heart problems or have had a stroke recently.

• **Duration**: 3-year study with different phases.
• **Compensation**: No mention of payment for participation.
• **Eligibility**: Must have a specific pacemaker and high blood pressure.