Observational Study Designed to Detect Decompensation of Congestive Heart Failure (dCHF) Using a Non-Invasive Wearable Device

This study is testing whether a non-invasive wearable device can detect early signs that heart failure is getting worse (called decompensation) in people who are already being monitored with an implanted pressure sensor in their heart. The goal is to add a wearable layer of monitoring that could catch problems even earlier and without an invasive implant. **You may be eligible if...** - You are 18 or older - You already have an implanted device that monitors your heart's blood pressure (hemodynamic sensor) - Your heart pressures have been stable for at least 4 consecutive weeks - You have a smartphone with Wi-Fi or cellular access **You may NOT be eligible if...** - You cannot give informed consent - You cannot read or understand English - You are unlikely to wear the device consistently - You are a prisoner - You are pregnant Talk to your doctor to see if this trial is right for you.