Janus Feasibility Study

Inclusion Criteria: * Subject is at least 18 years old * Subject with moderate to severe central sleep apnea is undergoing a de novo commercial remedē® System implant procedure or other de novo transvenous cardiac implantable device procedure including a pacemaker or an implantable cardiac defibrillator * Subject is willing and able to give informed consent Exclusion Criteria: * Subject is unable or unwilling to participate with study procedures or in the investigator's opinion is medically unstable for the procedure (Medically unstable is defined as when a patient is expected to have worsening health status if additional procedure time is needed) * Subject is pregnant or planning to become pregnant (all women with childbearing potential must have a negative pregnancy test within 7 days prior to the implant) * Subject is known to be allergic to radio opaque dye which cannot safely be pre-treated per the investigator * Subject has body mass index (BMI) \> 40 kg/m2 at the time of implant * Subject has had prior neck surgery * Previous or currently implanted upper airway stimulation device * Subject has had prior oral cavity surgery that may interfere with breathing * Subject has significant upper airway-related anatomic anomaly * Subject is enrolled in concurrent study that may confound the results of this study * Subject is taking muscle relaxant medication unless approved by the site implanter and ZOLL Respicardia clinical staff * Subject has evidence of nerve weakness/paresis/paralysis or a neurologic disorder that involves the tongue