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Farieda Chandoo, secretary


Mr Ahmed Ahmed is a consultant in upper gastrointestinal surgery and lead bariatric surgeon at Imperial Weight Centre. He has performed over 6,000 laparoscopic bariatric procedures, including over 4,000 gastric bypasses. He has trained in general and upper GI surgery in the UK and also at Stanford University and the University of Rochester in the US. He trains other surgeons in the field of bariatric surgery and is on the faculty of numerous courses on bariatric surgery. He is also actively involved in bariatric surgery research and has numerous publications in peer reviewed journals. He is a member of the American Society for Metabolic and Bariatric Surgery (ASMBS), International Federation of Surgery for Obesity (IFSO), Society of American Gastroenterological and Endoscopic Surgeons (SAGES), Association of Upper GI Surgeons (AUGIS) and the British Obesity and Metabolic Surgery Society (BOMSS). In 2007, he was awarded the International Federation of Surgery for Obesity (IFSO) scholarship. Mr Ahmed is often consulted by other professionals and medicolegal experts for his opinions on complex bariatric surgery cases. His Imperial Weight Centre bariatric surgery unit in London has been designated as an international centre of excellence for bariatric surgery and he now sits on the prestigious International Bariatric Surgery Review Committee (IBSRC), comprised of top bariatric surgeons from around the world who evaluate bariatric surgery units worldwide for 'centre of excellence' status.


Weight loss, laparoscopic surgery, general surgery, upper GI surgery

Research & publications

Mr Ahmed is actively involved in bariatric surgery research having undertaken a PhD degree in mechanisms of complications of gastric bypass surgery at Imperial College London. He is a clinical senior lecturer at Imperial College, London and has numerous publications in peer reviewed journals. He is on the editorial boards of the main obesity scientific journals SOARD and Obesity Surgery.

Publications include: 
Coe D, Ahmed AR The Hyperstethoscope Syndrome. Lancet 1995: 345 (8959) 1250

Ahmed AR, Taylor I Superior Mesenteric Artery Syndrome. Postgrad Med J 1997: 73 (866) 776  778

Ahmed AR, Taylor I Superior Mesenteric Artery Syndrome in Mixed Connective Tissue Disease. Gastroenterology Today 1997: 7 (3) 62  63

Ahmed AR, Marchbank A.J, Nicholson A.G, Wotherspoon A.C, Ladas G.P. Extramedullary Plasmacytoma Presenting with Myasthenia Gravis and Mediastinal Mass. Ann Thorac Surg. 2000 Oct;70(4):1390-2

Barker SGE, Cooper DG, Ahmed AR, Agu O, Challoner EJ, Hollingsworth SJ The 'Wound Boot': a preliminary assessment of a novel device for the management of leg ulcers..Phlebology 2001; 16: 73-75

Ahmed AR, Keshtgar M.R.S, Baum M. Ventriculo-peritoneal Shunt and Breast Carcinoma Ann R Coll Surg Eng 2001; 83:281-282

Ahmed AR. Bariatric Surgery (Review: selected internet viewings), Ann R Coll Surg Eng 2005; 87:392-393

Ahmed AR, Sharma A, Wellwood J, An unusual abdominal wall hernia. Ann R Coll Surg Eng 2005. DOI: 10.1308/147870805X50735

Ahmed AR Catheterisation in a large inguinoscrotal hernia

Ahmed AR, O'Malley W Internal hernia with roux loop obstruction during pregnancy after gastric bypass surgery. Obesity Surgery 2006; 16: 1246-1248

Ahmed AR, O'Malley W Laparoscopic Roux-en-Y Gastric Bypass in a Patient with Situs Inversus Obesity Surgery 2006; 16: 1392-1394

Ahmed AR, Rickards G, O'Malley W, Johnson J, Boss T Cholecystectomy during laparoscopic gastric bypass has no effect on duration of hospital stay. Obesity Surgery 2007; 17: 1075-1079

Ahmed AR, Husain S, Saad N, Patel NC, Waldman DL, O'Malley W, Accessing the common bile duct after Roux-en-Y gastric bypass. Surgery for Obesity and Related Diseases 2007; 3: 640-643

Husain S, Ahmed AR, Johnson J, Boss T, O'Malley W Small bowel obstruction after laparoscopic roux-en-y gastric bypass: etiology, diagnosis and management. Arch Surg. 2007;142:988-993

Husain S, Ahmed AR, Johnson J, Boss T, O'Malley W CT scan diagnosis of bleeding peptic ulcer after gastric bypass. Obesity Surgery 2007 Nov; 17(11):1520-2

Ahmed AR, Rickards G, Husain S, Johnson J, Boss T, O'Malley W Trends in internal hernia incidence after laparoscopic roux-en-y gastric bypass. Obesity Surgery 2007 Dec;17(12):1563-6

Ahmed AR, Rickards G, Husain S, Johnson J, O'Malley W, Boss T Bioabsorbable glycolide copolymer staple-line reinforcement decreases internal hernia rate after laparoscopic roux-en-y gastric bypass. Obesity Surgery 2008 Jul; 18 (7): 797-802

Ahmed AR, Rickards G, Messing S, Husain S, Johnson J, Boss T, O'Malley W. Roux limb obstruction secondary to constriction at transverse mesocolon rent after laparoscopic roux-en-y gastric bypass. SOARD 2009 Mar; 5(2):194

Ahmed AR, Sharma A, Wellwood J. Necrotising fasciitis following laparoscopic appendicectomy Ann R Coll Surg Eng 2008 DOI: 10.1308/147870808X302994

Hutchinson R, Ahmed AR, Menzies D, A case of intramural oesophageal dissection secondary to nasogastric tube insertion. Ann R Coll Surg Eng 2008 DOI: 10.1308/147870808X303128

Ahmed AR, Rickards G, Coniglio D, Xia Y, Johnson J, Boss T, O'Malley W. Laparoscopic Roux-en-Y Gastric Bypass and its Early Effect on Blood Pressure. Obesity Surgery 2009 19(7): 845

Ahmed AR, Rickards G, Johnson J, Boss T, O'Malley W. Radiological findings in symptomatic internal hernias after laparoscopic Roux- en-Y gastric bypass. Obesity Surgery 2009 19(11): 1530

Wyles S, Ahmed AR Technical tips and pearls in bariatric surgery. Minerva Chirurgia 2009 64(3): 253-264 24. Bueter M, Ahmed AR, Ashrafian H, le Roux C Bariatric surgery and hypertension. SOARD 2009 5(5): 615-620

Hakky S, Thompson M, Ahmed AR The provision of bariatric surgery in the uk past, present and future considerations: the road to excellence. Bariatric Times 2009 (Sep): 1-2
Ahmed AR, Bariatric centre spotlight: Imperial Weight Centre Bariatric Times 2009 (Sep): 20-21 27.

Wyles S, Ahmed AR Laparoscopic gastric bypass: A Training Model Bariatric Times 2009 (Dec): 6(12):12-13

Wyles S, Hakky S, Ahmed AR Unusual tales of the expected: gastric band complications - "The dye of the needle" and "Inside out", SOARD 2010 Nov-Dec;6(6):718-20

Bueter M, Dubb S, Gill A, Joannou L, Ahmed AR, Frankel AH, Tam FWK, le Roux C. Renal cytokines improve as early as four weeks after bariatric surgery. Br J Surg. 2010 Dec; 97(12):1838-44

Shah V, Shah S, Ahmed AR, Blunt D. Imaging In Bariatric Surgery: Service Set-up, Post-operative Anatomy And Complications. Br J Radiol. 2011 Feb;84(998):101-11

O'Donnell K, Cavanagh J, Le Roux C, Ahmed AR. Bariatric care in the community: recognizing and addressing barriers to long-term follow-up care for bariatric surgery patients. Bariatric Times 2010 (Jun): 7(6):22-23

Currie A, Chetwood A, Ahmed AR. Bariatric surgery and renal function. Review. Obesity Surgery. Obes Surg. 2011 Apr;21(4):528-39

Ahmed AR, Miskovic D, Vijayaseelan T, O'Malley W, Hanna GB Root cause analysis of internal hernia and Roux limb compression following laparoscopic Roux-Y Gastric Bypass using Observational Clinical Human Reliability Analysis (OCHRA). SOARD, 2012 8(2) :158-163

Pournaras D, Aasheim ET, Bueter M, Ahmed AR, Welbourn R, Olbers T, le Roux CW. The effect of bypassing the proximal gut on gut hormones involved with glycemic control and weight loss. SOARD, 2012 Jul-Aug;8(4):371-4

Lewis, T. M., Aggarwal, R., Kwasnicki, R. M., Rajaretnam, N., Moorthy, K., Ahmed AR, Darzi, A, Can virtual reality simulation be used for advanced bariatric surgical training?. Surgery, 2012; 151(6), 779-784

Bahra G, Desai A, Thillainayagam A, Ahmed AR. Pre-operative endoscopy in bariatric surgery patients. Gut 2012;61:A164-A165

Nehme, J., El-Khani, U., Chow, A., Hakky, S., Ahmed AR, & Purkayastha, S. The use of multimedia consent programs for surgical procedures: a systematic review. Surg Innov, 2013; 20(1), 13-23

Grapsa J, Tan TC, Paschou SA, Kalogeropoulos AS, Shimony A, Kaier T, Demir OM, Mikhail S, Hakky S, Purkayastha S, Ahmed AR, Cousins J, Nihoyannopoulos P. The effect of bariatric surgery on echocardiographic indices: a review of the literature. European journal of clinical investigation 43(11):1224-1230 01 nov 2013

Kaier TE, Morgan D, Grapsa J, Demir OM, Paschou SA, Sundar S, Hakky S, Purkayastha S, Connolly S, Fox KF, Ahmed AR, Cousins J, Nihoyannopoulos P. Ventricular remodelling post-bariatric surgery: is the type of surgery relevant? A prospective study with 3D speckle tracking, Eur Heart J Cardiovasc Imaging. 2014 Nov;15(11):1256-62

Sherif Awad, Sharon Carter, Sanjay Purkayastha, Sherif Hakky, Krishna Moorthy, Jonathan Cousins, Ahmed AR. Enhanced Recovery After Bariatric Surgery (ERABS): Clinical Outcomes from a Tertiary Referral Bariatric Centre. Obes Surg 2014, Volume 24 (5) 753-758

Scholtz S, Miras AD, Chhina N, Prechtl CG, Sleeth M, Daud NM, Ismail N, Durighel D, Ahmed AR, Olbers T, Vincent RP, Alaghband-Zadeh J, Ghatei MA, Waldman AD, Frost GS, Bell JD, le Roux CW, Goldstone AP. Obese patients after gastric bypass surgery have lower brain-hedonic responses to food than after gastric banding. Gut. 2014 Jun;63(6):891-902

El Khani U, Ahmed AR, Hakky S, Nehme J, Cousins J, Chahal H, Purkayastha S. The impact of obesity surgery on musculoskeletal disease. Obes Surg 2014, Volume 24 (12) 2175-2192

Rowland SP, Dharmarajah B, Moore HM, Lane T, Cousins J, Ahmed AR, Davies AH. IVC Filters for prevention of venous thromboembolism in obese patients undergoing bariatric surgery: A systematic review. Ann Surg. 2015 Jan; 261 (1):35-45

Khanbhai M, Dubb S, Patel K, Ahmed AR, Richards T. The prevalence of iron deficiency anaemia in patients undergoing bariatric surgery Obesity Research & Clinical Practice , Volume 9 , Issue 1 , 45 - 49

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