School of Medicine
University of Patras
>University of Patras
Personel - KEHAGIAS IO.



Sector: Division of Surgery

Clinic/Laboratory: Department of Surgery

Knowledge Subject: General Surgery

Research Area: General surgeryBariatric surgeryAdvanced laparoscopic surgery

University Hospital of PatrasRio, Patra, 26504 2nd Floor, 1st Building, Department of Surgery

+30 2610 994099

Download Curriculum Vitae

Summary of Curriculum Vitae

  • 1990: Medical degree at Medical School of Patras
  • 2001: Doctorate thesis at Medical School of Patras

Professional positions

  • 1991 - 1998: Resident in general surgery, University Hospital of Patras
  • 1999 - 2001: Intensive care unit training (two years), University Hospital of Patras
  • 2002 - 2009: Staff surgeon, University Hospital of Patras, Surgical Department
  • 2009 - 2016: Assistant Professor of Surgery, Surgical Department, Medical School, University of Patras
  • 2016 - today: Associate Professor of Surgery, Surgical Department, Medical School, University of Patras

Additional training

  • 1996: Instructor of A.T.L.S.
  • 1999: Instructor of P.H.T.L.S
  • 2003: Definitive Surgical Trauma Care Course Larissa, Greece
  • 2004: Morbid Obesity Masterclass (course, Elancourt, France)
  • 2004 - 2005: Advance training in laparoscopic and robotic surgery, Aosta-Italy
  • 2009: SILS (single incision laparoscopic surgery) Masterclass (course, Elancourt, France)

Undergraduate Courses

Selected Publications

Citations (Scopus database, 19/9/2015): 1131, h-index: 15

Read all the publications


  1. Enteral nutrition is superior to parenteral nutrition in severe acute pancreatitis: results of a randomized prospective trial. Kalfarentzos F, Kehagias J, Mead N, Kokkinis K, Gogos CA. Br J Surg. 1997 Dec;84(12):1665-9
  2. Prophylaxis of Venous Thromboembolism Using Two Different Doses of Low-Molecular-Weight Heparin (Nadroparin) in Bariatric Surgery: A Prospective Randomized Trial. Kalfarentzos F, Stavropoulou F, Yarmenitis S, Kehagias I, Karamesini M, Dimitrakopoulos A, Maniati A. Obes Surg. 2001 Dec;11(6):670-6
  3. Roux-en-Y Gastric Bypass versus a Variant of Biliopancreatic Diversion in a Non-Superobese Population: Prospective Comparison of the Efficacy and the incidence of Metabolic Deficiencies. Skroubis G, Anesidis S, Kehagias I, Mead N, Vagenas K, Kalfarentzos F. Obes Surg. 2006 Apr;16(4):488-95
  4. Vertical banded gastroplasty versus standard or distal Roux-en-Y gastric bypass based on specific selection criteria in the morbidly obese: preliminary results. Kalfarentzos F, Dimakopoulos A, Kehagias I, Loukidi A, Mead N. Obes Surg. 1999 Oct;9(5):433-42
  5. Revisional bariatric surgery 13-year experience from a tertiary institution. Spyropoulos C, Kehagias I, Panagiotopoulos S, Mead N, Kalfarentzos F. Arch Surg. 2010 Feb;145(2):173-7
  6. Hormone changes and diabetes resolution after biliopancreatic diversion and laparoscopic sleeve gastrectomy: a comparative prospective study. Tsoli M, Chronaiou A, Kehagias I, Kalfarentzos F, Alexandrides TK. Surg Obes Relat Dis. 2013 Sep-Oct;9(5):667-77
  7. Efficacy of sleeve gastrectomy as sole procedure in patients with clinically severe obesity (BMI≤50 kg/m2). Kehagias I, Spyropoulos C, Karamanakos S, Kalfarentzos F. Surg Obes Relat Dis. 2013 May-Jun;9(3):363-9
  8. Management of gastrointestinal leaks after surgery for clinically severe obesity. Spyropoulos C, Argentou MI, Petsas T, Thomopoulos K, Kehagias I, Kalfarentzos F. Surg Obes Relat Dis. 2012 Sep-Oct;8(5):609-15
  9. A Prospective Randomized Study Comparing Patients with Morbid Obesity Submitted to Sleeve Gastrectomy With or Without Omentectomy. Sdralis E, Argentou M, Mead N, Kehagias I, Alexandridis T, Kalfarentzos F. Obes Surg. 2013 Jul;23(7):965-71
  10. Lower ghrelin levels and exaggerated postprandial peptide-YY, glucagon-like peptide-1, and insulin responses, after gastric fundus resection, in patients undergoing roux-en-y gastric bypass: A randomized clinical trial. Chronaiou A, Tsoli M, Kehagias I, Leotsinidis M, Kalfarentzos F, Alexandrides TK. Obes Surg. 2012 Nov;22(11):1761-70
  11. Biliopancreatic diversion with Roux-en-Y gastric bypass and long limbs: Advances in surgical treatment for super-obesity. Kalfarentzos F, Skroubis G, Karamanakos S, Argentou M, Mead N, Kehagias I, Alexandrides TK. Obes Surg. 2011 Dec;21(12):1849-58
  12. Randomized clinical trial of laparoscopic Roux-en-Y gastric bypass versus laparoscopic sleeve gastrectomy for the management of patients with BMIor=70kg/m2). Spyropoulos C, Bakellas G, Skroubis G, Kehagias I, Mead N, Vagenas K, Kalfarentzos F. Obes Surg. 2008 Jul;18(7):803-9
  13. A prospective evaluation of a variant of biliopancreatic diversion with Roux-en-Y reconstruction in mega-obese patients (BMI>or=70kg/m2). Spyropoulos C, Bakellas G, Skroubis G, Kehagias I, Mead N, Vagenas K, Kalfarentzos F. Obes Surg. 2008 Jul;18(7):803-9
  14. Benefits and drawbacks of SILS cholecystectomy: A report of 60 SILS cholecystectomies with conventional instrumentation from an academic Center. Kehagias I, Karamanakos SN, Markopoulos GA, Kalfarentzos F. Surg Innov. 2012 Dec;19(4):438-45
  15. Laparoscopic versus open appendectomy: which way to go? Kehagias I, Karamanakos SN, Panagiotopoulos S, Panagopoulos K, Kalfarentzos F. World J Gastroenterol. 2008 Aug 21;14(31):4909-14

Selected Presentations

  • SILS cholecystectomy with conventional instruments

Single Incision Laparoscopic Surgery

3rd International Experts’ Meeting on Advanced Laparoscopic Surgery

1st International Metabolic Surgery Symposium, Athens, 17 - 19th September 2010

  • 24 more presentations in Greek congresses and postgraduate lectures across Greece, focused on General Surgery, Bariatric Surgery, Advanced Laparoscopic Surgery and Trauma.

Other Activities

  • Coordinator ECTS of the committee LLP-Erasmus for the academic year 2012-2013.