Ultrafiltration Therapy Registry Using Aquadex (ULTRA-Peds)

The ULTRA-PEDs registry is designed to capture data in the real-World clinical setting on the Aquadex™ system in local standard of care, with the aim of understanding it's performance and utilization. Enrollment is expected to take approximately 2.5 years from the time the first patient is enrolled to the time the final patient is discharged from the hospital. ULTRA-PEDs will allow prospective and retrospective data collection for the following scenarios: * All prospective data for on-label use only (i.e., Aquadex ultrafiltration therapy for pediatric patients weighing 20 kg or more, whose fluid overload is unresponsive to medical management, including diuretics). * Retrospective patients at the time of registry approval by IRB regardless of on-label or off-label use. * Retrospective on-label use * Retrospective off-label use (i.e., Aquadex ultrafiltration with other adjunctive or conjunctive therapies for pediatric patients who may weigh less than 20kg)