Before revision:  The results presented here can serve as the performance criteria for designing cavopulmonary assist devices as well as evaluating off-label use of commercially available left-side blood pumps for failing Fontan cavopulmonary support.
After revision:  The results show that a suitable cavopulmonary assist device could increase cardiac index by 5-45\% and decrease the IVC pressure by 5-70\% depending on the patient's pre-support hemodynamic state and surgical configuration of the cavopulmonary assist device (IVC or full support). The presented flow-pressure operating regions can serve as the performance criteria for designing cavopulmonary assist devices as well as evaluating off-label use of commercially available left-side blood pumps for failing Fontan cavopulmonary support.