Alfapump DSR System in the Treatment of Diuretic Resistant Heart Failure Subjects

Up to 10 subjects diagnosed with stable chronic heart failure (CHF) on high oral diuretic dose and an MDRD eGFR > 30ml/min/1.73m2 will undergo subcutaneous implantation of the alfapump DSR system (Day-13) and portacath system and participate in a 6 week interventional study. Prior to an inpatient study period, the subject will undergo a 40mg IV furosemide (or 1 mg IV bumetanide) diuretic challenge with timed biospecimen collection. On day 14 post-implant (Day 0), the subject will be admitted for a 14-day period in which diuretics will be withheld and subjects will be on a strict low-sodium (3g/day) diet with strict intake/output and all urine collected and samples saved for analysis. During the first 7 days (Day 0 - 6) subjects will be treated with 1000ml of DSR Infusate Monday, Wednesday, Friday administered to the peritoneal cavity through the subcutaneous peritoneal catheter. The infusate will remain in the peritoneal cavity for a 2 hour dwell time, then all fluid will be removed from the peritoneal cavity to the urinary bladder using the alfapump DSR system over the subsequent 8 hours. On day 7, subjects will be transitioned to a moderate to high salt diet given as the same low-sodium (3g/day) diet with supplementation with sodium chloride tablets (2g/day) (5g/day total sodium), as this will likely represent their typical home sodium intake. During this time, the optimal treatment protocol (frequency of administration and volume of DSR infusate administered) for individual subjects based on daily sodium balance, weight changes, and blood pressure will be created and tested over the next seven days in hospital (Day 7 - 13). Following the inpatient period, a second diuretic challenge will be conducted. Over the subsequent 28 days, diuretics will continue to be withheld with preferential maintenance of euvolemia through DSR and subjects will come into the clinic based on their tailored therapy schedule and undergo supervised DSR infusate administration. Addition of diuretic treatment will only be allowed if maximal DSR therapy has been instituted (DSR 7 days per week (i.e., including weekends) at 1.5L per session with dwell time of 4 hours) and/or holding diuretics until additional DSR can be utilized would represent a risk to the subject, as described in the CIP diuretic algorithm.

After the completion of the study period, the alfapump DSR therapy is halted and the subject undergoes a third diuretic challenge to quantify diuretic response. At this point oral diuretic therapy will be resumed. At the end of the study the alfapump can remain implanted and set to 'dormant' state after discussion and agreement between subject and investigator, and if there are no clinical, ethical or other reasons indicating explanation of the alfapump. Alternatively, the subject may elect to enroll into a low intensity follow-on study.