The alfapump® system is currently not approved in the United States or Canada. In the United States and Canada, the alfapump® system is currently under clinical investigation (POSEIDON Study) and is being studied in adult patients with refractory or recurrent ascites due to cirrhosis. DSR® therapy is still in development and it should be noted that any statements regarding safety and efficacy arise from ongoing pre-clinical and clinical investigations which have yet to be completed. There is no link between the DSR® therapy and ongoing investigations with the alfapump® system in Europe, the United States or Canada.

Liver disease and malignant ascites

Ongoing studies
Published & Presented studies
Other alfapump publications


This is a single-arm, open-label, within subject crossover study of the alfapump® in patients with recurrent or refractory ascites due to liver cirrhosis in centres across the U.S. and Canada. All patients have been enrolled in the study and implanted with the alfapump®. Pivotal Cohort patients entered into a 3-month pre-implant observation period in which they received standard of care therapy (consisting of paracentesis) before the alfapump® was implanted. Of the 71 patients enrolled in the Pivotal Cohort, 40 patients have been implanted with the alfapump®. The study allowed for additional patients to be enrolled in a Roll-In Cohort, to ensure centres were experienced with the alfapump® implantation prior to enrolment in the Pivotal Cohort. Finally, 29 patients from the Roll-In Cohort have been implanted with the alfapump®.

The primary effectiveness outcomes of the study include the proportion of patients with a 50% reduction in therapeutic paracentesis in the post-implant observation period (month four to month six after implantation) as compared to the pre-implant observation period. The primary safety endpoint is the rate of alfapump® related re-interventions adjudicated by the Clinical Events Committee. Patients will be followed for up to two years for analysis of secondary outcome measurements including safety (device and/or procedure-related adverse events), quality of life (assessed by general SF-36 as well as disease-specific Ascites-Q questionnaires), patients’ nutritional status, health economics and overall survival. For more information about the study, please visit clinicaltrials.gov (NCT03973866).

  • One-year follow-up data from POSEIDON Pivotal Cohort: Press release on 19 October 2023
  • Additional results POSEIDON Pivotal Cohort presented at EASL 2023: Webcast by Sequana Medical on 21 June 2023
  • Top-line results POSEIDON Pivotal Cohort: Webcast by Sequana Medical on 25 October 2022
  • Interim results POSEIDON Roll-In Cohort: Webcast by Sequana Medical on 1 July 2021


This is a prospective, multi-centre, open-label, randomised, health-economic study in France to evaluate the cost utility of the alfapump® versus standard of care in 90 patients with liver refractory ascites, 60 patients not waiting for liver transplant and 30 patients as bridge to transplant, over 12 months. The goal of the study is to support French reimbursement. The study is funded by the French government and being conducted and sponsored by leading French clinicians (NCT03506893).


This is a European registry to collect data from prospectively enrolled patients that have been implanted with the alfapump® across commerical centres in Europe. The registry is supported by key opinion leaders and will assess the adverse event profile of the alfapump® following the technical improvements in product design and care protocols, as well as the effectiveness in real world circumstances. Patients are being enrolled on a continual basis and interim readouts will take place at regular time points.


Retrospective, multi-centre, open-label study in Europe to assess the performance and safety of the alfapump® in 17 patients with malignant ascites (NCT03200106).

Fotopoulou et al., BMC Palliative Care, 2019
Abstract | Poster by Fotopoulou et al., IGCS, 2018


Prospective, multi-centre, open-label, single-arm study in North America to assess the safety and efficacy of the alfapump® in 30 patients with liver recurrent or refractory ascites not eligible for TIPS (NCT02400164).

Wong at al., liver Transplantation, 2020
Abstract | Poster par Wong et al., AASLD, 2017
Poster by Wong et al., AASLD, 2018

Retrospective, single-centre study at Hannover Medical School to investigate the alfapump® as an alternative for LVP in 21 patients with liver refractory ascites with a contraindication for TIPS or liver transplant.

Solbach et al., European Journal of Gasteroenterology & Hepatology, 2018

Prospective, multi-centre, open-label, observational study in Europe designed to follow 100 patients with liver refractory ascites with a contra-indication to TIPS and therefore treated with an alfapump® for up to 24 months (NCT01532427).

Stirnimann et al., Liver International, 2022 (data from 106 patients)
Stirnimann et al., Alimentary Pharmacology & Therapeutics, 2017 (data from first 56 patients)
Editorial by Macdonald and Jalan, Alimentary Pharmacology & Therapeutics, 2017

Prospective, multi-centre, open-label, randomised and controlled study in Europe of the alfapump® versus LVP standard of care in 58 patients with liver refractory ascites (NCT01528410).

Bureau et al., Journal of Hepatology, 2017
Stepanova et al., Quality of Life Research, 2017

Prospective, multi-centre, open-label, uncontrolled study in Europe to assess the safety and performance of the alfapump® in 40 patients with liver refractory ascites and diuretic resistance (NCT01030185).

Bellot et al., Journal of Hepatology, 2013

Consensus care recommendations for alfapump® in cirrhotic patients with refractory or recurrent ascites

Niels Kristian Aagaard et al., BMC Gastroenterology, 2022

Surgical technique for placement of the automated low flow ascites pump (alfapump®)

Dembinski et al., Springer Langenbeck’s Archives of Surgery, 2020

Case study of treatment of a patient with malignant ascites using the alfapump®.

Storni et al., The American Journal of Gastroenterology, 2018

Review of the available data about patient selection, efficacy and safety of the alfapump® and recommendations for the management of patients treated with the alfapump®.

Stirnimann et al., Therapeutics Advances in Gastroenterology, 2017