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Ahmed Nasr photo of Ahmed Nasr
Investigator, CHEO Research Institute
Assistant Professor, Division of Pediatric Surgery, CHEO
Associate Professor, Department of Surgery,
Faculty of Medicine, University of Ottawa,
Assistant Professor, Department of Clinical Epidemiology,
University of Ottawa
Trauma Program Medical Director, CHEO
613-737-7600 Ext. 3748
Research Practice Areas:
  • Evidence-Based Medicine
  • Pediatric Surgery
Current Research:

Dr. Nasr is currently conducting multiple systematic reviews/meta-analyses, randomized controlled trials, and prospective and retrospective outcome studies in the field of pediatric surgery. He has developed an evidence-based resource for pediatric surgeons worldwide (

Research Team:

Dr. Ahmed Nasr is a pediatric surgeon in the Division of General Surgery at CHEO, with a Master of Science degree in Epidemiology. He completed his medical education at the Hospital for Sick Children, University of Toronto before coming to CHEO. He is a passionate researcher with over 50 peer reviewed publications. His research interests include minimally invasive surgery, pediatric trauma, and evidence-based medicine.

Sample Publications:
El Demellawy D, El Hallani S, de Nanassy J, Lee JY, Chan E, Sullivan K, Bass J, Mack D, Nasr A. Value of histopathology for predicting the post-operative complications of ileo-anal anastomosis (J-pouch) procedure in children with refractory ulcerative colitis. Pathology 2016; 48(4):330-335.

Kapralik J, Wayne C, Chan E, Nasr A. Surgical versus conservative management of congenital pulmonary airway malformation in children: A systematic review and meta-analysis. J Pediatr Surg 2016; 51(3):508-512.

El Demellawy D, Cundiff CA, Nasr A, Ozolek JA, Elawabdeh N, Caltharp SA, Masoudian P, Sullivan KJ, de NJ, Shehata BM. Congenital mesoblastic nephroma: a study of 19 cases using immunohistochemistry and ETV6-NTRK3 fusion gene rearrangement. Pathology 2016; 48(1):47-50.
Chernetsova E, Sullivan K, de Nanassy J, Barkey J, Mack D, Nasr A, El Demellawy D. Histologic analysis of eosinophils and mast cells of the gastrointestinal tract in healthy Canadian children. Hum Pathol 2016; 54:55-63.
Wayne C, Chan E, Nasr A, Canadian Association of Paediatric Surgeons Evidence-Based Resource. What is the ideal surgical approach for intra-abdominal testes? a systematic review. Pediatr Surg Int. 2015;31(4):327-38.


Trudeau MO, Nasr A, Carrillo B, Gerstle JT, Azzie G. Construct validity and educational role for motion analysis in a laparoscopic trainer. Surg Endosc. 2014 Dec 6. [Epub ahead of print].


Glen P, Chassé M, Doyle MA, Nasr A, Fergusson DA. Partial versus complete fundoplication for the correction of pediatric GERD: a systematic review and meta-analysis. PLoS One. 2014;9(11):e112417.


El Demellawy D, Chang N, de Nanassy J, Nasr A. GALNT3 gene mutation-associated chronic recurrent multifocal osteomyelitis and familial hyperphosphatemic familial tumoral calcinosis. Scand J Rheumatol. 2014:1-3.


Sklar CM, Chan E, Nasr A. Laparoscopic versus open reduction of intussusception in children: a retrospective review and meta-analysis. J Laparoendosc Adv Surg Tech A. 2014;24(7):518-22.


Nasr A, Carrillo B, Gerstle JT, Azzie G. Motion analysis in the pediatric laparoscopic surgery (PLS) simulator: validation and potential use in teaching and assessing surgical skills. J Pediatr Surg. 2014;49(5):791-4.


Nasr A, Haricharan RN, Gamarnik J, Langer JC. Transanal pullthrough for

Hirschsprung disease: matched case-control comparison of Soave and Swenson techniques. J Pediatr Surg. 2014;49(5):774-6.


Chan E, Wayne C, Nasr A. Minimally invasive versus open repair of Bochdalek hernia: a meta-analysis. J Pediatr Surg. 2014;49(5):694-9.


Ein SH, Nasr A, Wales PW, Ein A. Testicular atrophy after attempted pediatric orchidopexy for true undescented testis. J Pediatr Surg. 2014;49(2):317-22.
Chan E, Wayne, Nasr A, for the Canadian Association of Pediatric Surgeons Evidence-Base Resource. Ideal timing of orchiopexy: a systematic review. Pediatr Surg Int. 2014;30(1);87-97.
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