The study is evaluating the safety and performance of the CPNS System in patients suffering from acute decompensated heart failure (ADHF), defined as new or worsening symptoms of heart failure. The first U.S. patient was enrolled and implanted at The Ohio State University Wexner Medical Center in Columbus, OH by Principal Investigator, Dr. Sitaramesh Emani, assisted by Dr. Rami Kahwash.