Ralph Peterli

Prof. Dr. med.
Ralph Peterli

Deputy Chief Surgeon
Head of Visceral Surgey Research

Department of Visceral Surgery
CLARUNIS - University Center for Gastrointestinal and Liver Disesases Basel

Phone +41 61 777 75 26



Research Focus

Endocrinology, Metabolism & Developmental Disorders

Area of Research

Bariatric and metabolic surgery, surgical techniques, clinical outcome, mechanisms of action

Approved Research Projects

Swiss Multicenter Randomized Controlled Trial on different Limb Lengths in Gastric Bypass Surgery (SLIM)


    National Collaborations

    • Clara Forschung AG (B. Wölnerhanssen, A. Meyer-Gerspach)
    • Biozentrum Basel (M. Shimobayashi)
    • USZ Viszeralchirurgie (M.Bueter, D. Gero)
    • Endokrinologie USB (M. Donath, C. Cavelti, K. Timper)
    • USZ Gastroentreologie (Ch. Gubler)
    • ETH Zürich (Th. Lutz), CHUV (M.Suter)
    • HUG (M. Jung)
    • Viszeralchirurgie Luzern (M. Gass)

    International Collaborations

    • Turku University, Fi (P. Salminen)
    • University College London (R. Batterham)
    • Dublin University (C. le Roux)
    • Karolinska Stockholm (A. Thorell)
    • Götheborg SE (T. Olbers)
    • Arnhem, Nl (E. Aarts)
    • Columbia University New York (A. Emiliano)

    Ongoing Research Projects

    • Long-term adverse effects after bariatric surgery (Barrett esophagus, bone density)
    • mTORC2 activity in adipose tissue
    • Peri- and postoperative tablet-based telemonitoring of patients undergoing bariatric surgery
    • Gastric microperfusion during laparoscopic Roux-en-Y gastric bypass
    • Gallbladder disease and bariatric surgery, retrospective cohort study
    • Long-term results after laparoscopic sleeve gastrectomy
    • Laparoscopic Roux-en-Y gastric bypass versus laparoscopic mini gastric bypass in the treatment of obesity: a randomized controlled trial

    Additional translational projects in murine models

    Research Team

    PD Dr. med. Tarik Delko

    Scientific Surgeon

    Phone +41 61 777 73 15

    Dr. med. Marko Kraljevic

    Scientific Surgeon

    Phone +41 61 777 75 33

    Dr. med. Romano Schneider

    Scientific Surgeon

    Phone +41 61 777 73 33