The Cheetah Reliant™ provides continuous tracking of Cardiac Output and other key parameters of cardiac function such as Vascular Resistance, Heart Rate, Thoracic Fluid Content, Ventricular Ejection Time and dX/dt which relates to peak flow. The system is identical in terms of internal design and performance to the Cheetah Universal™ Unit (lap-top mounted) which has been used in multiple clinical applications. These include in-patient settings such as ICU, Anesthesia, Peri-Operative Step Down, ER and CCU as well as outpatient applications such as Hemo-Dialysis, Exercise Cardiac Output stress testing (ECO®) for CHF evaluation and during optimization of bi-ventricular pacemakers.