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Daniel Moritz Felsenreich
Ap. Prof. Priv. Doz. DDr. Daniel Moritz Felsenreich, FEBS, FACS, FIFSO

Department of General Surgery (Division of Visceral Surgery)
Position: Associate Professor

ORCID: 0000-0002-5229-5096
T +43 1 40400 56220


Anastomosis, Roux-en-Y; Bariatric Medicine; Bariatric Surgery; Bariatrics; Bile Reflux; Gastric Bypass; Gastroesophageal Reflux

Research interests

Metabolic / bariatric surgery focusing on long-term outcome regarding reflux, Barrett´s Esohagus, weight recurrence and complications

Techniques, methods & infrastructure

  • Retrospective database analyses
  • Prospective clinical trials
  • Metaanalysis


Selected publications

  1. Felsenreich, D.M. et al. (2022) ‘Fifteen Years after Sleeve Gastrectomy: Gastroscopies, Manometries, and 24-h pH-Metries in a Long-Term Follow-Up: A Multicenter Study’, Obesity Facts, pp. 1–8. Available at:
  2. Felsenreich, D.M. et al. (2022) ‘Outcome of Sleeve Gastrectomy Converted to Roux-en-Y Gastric Bypass and One-Anastomosis Gastric Bypass’, Obesity Surgery, 32(3), pp. 643–651. Available at:
  3. Felsenreich, D.M. et al. (2020) ‘Meta-analysis of Postoperative Mortality and Morbidity After Total Abdominal Colectomy Versus Loop Ileostomy With Colonic Lavage for Fulminant Clostridium Difficile Colitis’, Diseases of the Colon & Rectum, 63(9), pp. 1317–1326. Available at:
  4. Felsenreich, D.M. et al. (2023) ‘Young-IFSO Bariatric/Metabolic Surgery Training and Education Survey’, Obesity Surgery, 33(9), pp. 2816–2830. Available at:
  5. Felsenreich, D.M. et al. (2023) ‘Esophageal function and non-acid reflux evaluated by impedance-24 h-pH-metry, high-resolution manometry, and gastroscopy after one-anastomosis gastric bypass—outcomes of a prospective mid-term study’, Surgical Endoscopy, 37(5), pp. 3832–3841. Available at: