David Armstrong, MA, MB BChir, FRCP, FRCPC, FACG, AGAF

Professor, Department of Medicine


  •  Upper gastrointestinal diseases including gastroesophageal reflux disease (GERD), Barrett’s esophagus, Helicobacter pylori-related disease and dyspepsia.
  • Nutrition, including home parenteral nutrition
  • Practice audit and education in endoscopy


  • Clinical studies in the management of GERD, Barrett’s esophagus and upper gastrointestinal bleeding
  • Studies of the symptomatology of gastrointestinal diseases including GERD, inflammatory bowel disease and the irritable bowel syndrome
  • The assessment of upper gastrointestinal tract sensitivity using barostat techniques and monitoring of heart rate variability
  • Pharmacological and physiological studies of gastric acidity
  • The clinical investigation of H. pylori infection using 13C Urea Breath
  • The endoscopic diagnosis of reflux esophagitis and Barrett’s esophagus
  • Practice audit in gastroenterology
  • Implementation of consensus recommendations in the management of Canadian patients with non-variceal upper gastrointestinal bleeding: A national cluster randomized trial of a tailored multifaceted intervention. October 2008- September 2010 Co-investigator (PI: ANG Barkun)
  • Quality of Care in Patients Admitted to Hospital Because of an Episode of GI Bleeding. July 2008 – June 2010. Co-Investigator (PI: ANG Barkun)
  • Vascular events in non-cardiac surgery patients cohort evaluation (VISION) Study. August 2007 – June 2009. Co-applicant (PI: PJ Devereaux) (Heart and Stroke Foundation of Ontario
  • Barrett’s esophagus registry — pilot for Canadian National Database. 2005-2008 (AstraZeneca Canada)
  • Histology of the Esophagus in Acid Related Disorders — The HEARD Study. 2005 — 2008 (AstraZeneca) — Principal Investigator
  1. Fouda, MA, Khan, AA, Sultan, M, Rios, LP, McAssey, K, Armstrong, D et al.. Corrigendum to "Evaluation and Management of Skeletal Health in Celiac Disease: Position Statement". Can J Gastroenterol Hepatol. 2017;2017 :1323607. doi: 10.1155/2017/1323607. PubMed PMID:28752082 PubMed Central PMC5511633.
  2. Pinto-Sánchez, MI, Causada-Calo, N, Bercik, P, Ford, AC, Murray, JA, Armstrong, D et al.. Safety of Adding Oats to a Gluten-Free Diet for Patients With Celiac Disease: Systematic Review and Meta-analysis of Clinical and Observational Studies. Gastroenterology. 2017;153 (2):395-409.e3. doi: 10.1053/j.gastro.2017.04.009. PubMed PMID:28431885 .
  3. Tse, Y, Armstrong, D, Andrews, CN, Bitton, A, Bressler, B, Marshall, J et al.. Treatment Algorithm for Chronic Idiopathic Constipation and Constipation-Predominant Irritable Bowel Syndrome Derived from a Canadian National Survey and Needs Assessment on Choices of Therapeutic Agents. Can J Gastroenterol Hepatol. 2017;2017 :8612189. doi: 10.1155/2017/8612189. PubMed PMID:28271055 PubMed Central PMC5320366.
  4. Johnson, DA, Katz, PO, Armstrong, D, Cohen, H, Delaney, BC, Howden, CW et al.. The Safety of Appropriate Use of Over-the-Counter Proton Pump Inhibitors: An Evidence-Based Review and Delphi Consensus. Drugs. 2017;77 (5):547-561. doi: 10.1007/s40265-017-0712-6. PubMed PMID:28233274 PubMed Central PMC5357248.
  5. Enns, RA, Hookey, L, Armstrong, D, Bernstein, CN, Heitman, SJ, Teshima, C et al.. Clinical Practice Guidelines for the Use of Video Capsule Endoscopy. Gastroenterology. 2017;152 (3):497-514. doi: 10.1053/j.gastro.2016.12.032. PubMed PMID:28063287 .
  6. Armstrong, D, Nakhla, N. Non-prescription proton-pump inhibitors for self-treating frequent heartburn:the role of the Canadian pharmacist. Pharm Pract (Granada). ;14 (4):868. doi: 10.18549/PharmPract.2016.04.868. PubMed PMID:28042359 PubMed Central PMC5184381.
  7. McKay, D, Armstrong, D, Sadowski, D, Jones, N, MacNaughton, W, Sinclair, P et al.. Canadian Association of Gastroenterology: Strategic Plan 2016-2020. Can J Gastroenterol Hepatol. 2016;2016 :5301452. doi: 10.1155/2016/5301452. PubMed PMID:27517033 PubMed Central PMC4969536.
  8. Hortencio, TDR, Arendt, BM, Teterina, A, Jeejeebhoy, KN, Gramlich, LM, Whittaker, JS et al.. Changes in Home Parenteral Nutrition Practice Based on the Canadian Home Parenteral Nutrition Patient Registry. JPEN J Parenter Enteral Nutr. 2017;41 (5):830-836. doi: 10.1177/0148607115609289. PubMed PMID:26407599 .
  9. Major, D, Armstrong, D, Bryant, H, Cheung, W, Decker, K, Doyle, G et al.. Recent trends in breast, cervical, and colorectal cancer screening test utilization in Canada, using self-reported data from 2008 and 2012. Curr Oncol. 2015;22 (4):297-302. doi: 10.3747/co.22.2690. PubMed PMID:26300668 PubMed Central PMC4530815.
  10. Rahman, A, Wu, T, Bricknell, R, Muqtadir, Z, Armstrong, D. Malnutrition Matters in Canadian Hospitalized Patients: Malnutrition Risk in Hospitalized Patients in a Tertiary Care Center Using the Malnutrition Universal Screening Tool. Nutr Clin Pract. 2015;30 (5):709-13. doi: 10.1177/0884533615598954. PubMed PMID:26253124 .
Search PubMed
Share on FacebookTweet about this on TwitterShare on Google+Share on LinkedIn