Bariatric Research and Publications
Advancing Care Through Bariatric Research
At MyLife Bariatrics, our commitment to exceptional patient care extends beyond the operating room. Dr. Karim Ramji, Dr. Ari Doumouras, and Dr. Dennis Hong have collectively authored and co-authored more than 100 peer-reviewed publications and scientific presentations that advance the understanding of:
- Bariatric surgery
- Obesity treatment
- Gastric sleeve surgery
- Metabolic health
- Long-term patient outcomes
Bariatric research is an important part of how we deliver care. By staying actively involved in clinical studies and contributing to the latest evidence, our surgeons remain at the forefront of advancements in bariatric medicine.
Combined with our collaborative triple-check approach, this academic expertise helps ensure every patient benefits from care that is informed by the latest science, supported by experience, and focused on achieving safe, lasting results.
Below is a selection of peer-reviewed publications and presentations authored or co-authored by the MyLife Bariatrics team.
2026
Association Between Bariatric Surgery and the Long-Term Risk for Venous Thromboembolism: A Population-Based Matched Cohort Study – Read more
Author: Dr. Ari Doumouras, et al.
Efficacy and Safety of Tranexamic Acid Use in Bariatric Surgery: An Updated Systematic Review and Meta-Analysis – Read more
Author: Dr. Dennis Hong, et al.
Maternal, Fetal, and Infant Outcomes Associated With Bariatric Surgery: A Matched Cohort Study – Read more
Author: Dr. Ari Doumouras, et al.
Preoperative Low-Energy Diets for Patients With a Body Mass Index >30 kg/m² Undergoing Non-Bariatric Surgery: Pilot Feasibility Randomized Clinical Trial and a Systematic Review and Meta-analysis of Efficacy Data – Read more
Authors: Dr. Karim Ramji, Dr. Ari Doumouras, et al.
2025
Editorial: Journey through bariatric surgery – Read more
Author: Dr. Ari Doumouras, et al.
Evaluating Weight Loss Associated with Bariatric Surgery After Liraglutide Use: A Matched Population-Level Retrospective Cohort Study – Read more
Author: Dr. Ari Doumouras, et al.
Impact of bariatric surgery on patients with chronic kidney disease and severe obesity: multiple-linked population-based cohort study – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Large Language Models for Chatbot Health Advice Studies: A Systematic Review – Read more
Author: Dr. Karim Ramji, et al.
Obstructive sleep apnea in bariatric surgery patients: a population-based study – Read more
Author: Dr. Ari Doumouras, et al.
Predictors of Anemia Recovery in Patients with Pre-existing Anemia Undergoing Metabolic Bariatric Surgery: A Retrospective Cohort Study – Read more
Author: Dr. Ari Doumouras, et al.
Prescribing preoperative weight loss prior to major non-bariatric surgery for patients with elevated weight: a national provider survey (PREPARE provider survey) – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Psychiatric and Cognitive Functioning After Metabolic and Bariatric Surgery: A Systematic Review and Meta-Analysis – Read more
Author: Dr. Ari Doumouras, et al.
2024
Assessment of guidelines for bariatric and metabolic surgery: a systematic review and evaluation using appraisal of guidelines for research and evaluation II (AGREE II) – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Dr. GPT Will See You Now: The Ability of Large Language Model-Linked Chatbots to Provide Colorectal Cancer Screening Recommendations – Read more
Author: Dr. Karim Ramji, et al.
Harnessing artificial intelligence in bariatric surgery: comparative analysis of ChatGPT-4, Bing, and Bard in generating clinician-level bariatric surgery recommendations – Read more
Author: Dr. Dennis Hong, et al.
Patient Satisfaction With Roux-en-Y Gastric Bypass and Sleeve Gastrectomy at 10 Years After Surgery – Read more
Authors: Dr. Karim Ramji, Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Pharmacokinetics of direct oral anticoagulants after bariatric surgery: A retrospective cohort study – Read more
Author: Dr. Ari Doumouras, et al.
PReoperative Very Low-Energy Diets for Obese Patients Undergoing Non-Bariatric Surgery Randomized Evaluation (PREPARE): A Protocol for a Pilot Randomized Controlled Trial – Read more
Authors: Dr. Karim Ramji, Dr. Ari Doumouras, et al.
PREscribing preoperative weight loss prior to major non-bariatric abdominal surgery for patients with Elevated weight: Patient and Provider Survey Protocols (PREPARE surveys) – Read more
Author: Dr. Ari Doumouras, et al.
Protocol for the Development of the Chatbot Assessment Reporting Tool (CHART) for Clinical Advice – Read more
Author: CHART Collaborative
Ten-Year Outcomes and Quality of Life in Patients Undergoing Roux-en-Y Gastric Bypass Surgery – Read more
Authors: Dr. Karim Ramji, Dr. Ari Doumouras, Dr. Dennis Hong, et al.
2023
A history of bariatric surgery before surgery for colorectal cancer may improve short-term postoperative outcomes: Analysis of the national inpatient sample 2015-2019 – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Financial toxicity risk among patients with gastric banding complications in the United States: analysis of the National Inpatient Sample – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Fragility of statistically significant outcomes in randomized trials comparing bariatric surgeries – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Gastrojejunostomy versus endoscopic stenting for the palliation of malignant gastric outlet obstruction: a systematic review and meta-analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Residual Risk of Breast Cancer After Bariatric Surgery – Read more
Author: Dr. Ari Doumouras, et al.
Retrospective Study Examining the Impact of Implementation of a Bariatric Enhanced Recovery After Surgery Protocol on Post-Operative Opioid Consumption at a High-Volume Bariatric Centre in Ontario
Author: Dr. Karim Ramji, et al.
The Effect of Chronic Kidney Disease or End-stage Kidney Disease on Perioperative Outcomes and Healthcare Utilization in Patients Undergoing Bariatric Surgery – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Treatments and Challenges – Read more
Author: Dr. Karim Ramji, et al.
Very low energy diets prior to bariatric surgery may reduce postoperative morbidity: a systematic review and meta-analysis of randomized controlled trials – Read more
Author: Dr. Ari Doumouras, et al.
2022
Bariatric Center Designation and Outcomes Following Repeat Abdominal Surgery in Bariatric Patients – Read more
Author: Dr. Ari Doumouras, et al.
Bariatric Surgery and Breast Cancer Incidence: a Population-Based, Matched Cohort Study – Read more
Author: Dr. Ari Doumouras, et al.
Bariatric Surgery as a Bridge to Heart Transplantation in Morbidly Obese Patients: A Systematic Review and Meta-Analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Benefits of dexmedetomidine on postoperative analgesia after bariatric surgery – Read more
Author: Dr. Dennis Hong, et al.
Contraceptive counselling in 3 Canadian bariatric surgery clinics: a multicentre qualitative study of the experiences of patients and health care providers – Read more
Author: Dr. Dennis Hong, et al.
Effect of Bariatric Surgery on Natriuretic Peptide Levels: A Systematic Review and Meta-Analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Improvement of kidney function in patients with chronic kidney disease and severe obesity after bariatric surgery: A systematic review and meta-analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Outcomes of Bariatric Surgery in Elderly Patients: A Registry-Based Cohort Study With 3-Year Follow-up – Read more
Author: Dr. Karim Ramji, et al.
Risk factors for abdominal reoperations in bariatric patients – Read more
Author: Dr. Ari Doumouras, et al.
Same-Day Discharge Roux-en-Y Gastric Bypass at a Canadian Bariatric Centre: Pathway Implementation and Early Experiences – Read more
Authors: Dr. Karim Ramji, Dr. Dennis Hong, et al.
Very low energy diets before nonbariatric surgery: A systematic review and meta-analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
What patient factors influence bariatric surgery outcomes? A multiple regression analysis of Ontario Bariatric Registry data – Read more
Author: Dr. Dennis Hong, et al.
2021
Access to bariatric surgery among older patients in a publicly funded regionalized care system – Read more
Author: Dr. Ari Doumouras, et al.
Association Between Bariatric Surgery and Major Adverse Diabetes Outcomes in Patients With Diabetes and Obesity – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Bariatric Surgery and Cardiovascular Outcomes in Patients With Obesity and Cardiovascular Disease:: A Population-Based Retrospective Cohort Study – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Benefits of Transversus Abdominis Plane Block on Postoperative Analgesia after Bariatric Surgery: A Systematic Review and Meta-Analysis – Read more
Author: Dr. Dennis Hong, et al.
Comparison of 4-Year Health Care Expenditures Associated With Roux-en-Y Gastric Bypass vs Sleeve Gastrectomy – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Comparison of Single- Versus Double-Anastomosis Duodenal Switch: A Single-Center Experience With 2-Year Follow-up – Read more
Authors: Dr. Karim Ramji, Dr. Dennis Hong, et al.
Effects of Perioperative Cannabis Use on Bariatric Surgical Outcomes: a Systematic Review – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Iron supplementation following bariatric surgery: A systematic review of current strategies – Read more
Author: Dr. Ari Doumouras, et al.
Laparoscopic Sleeve Gastrectomy Versus Laparoscopic Roux-en-Y Gastric Bypass: A Systematic Review and Meta-analysis of Weight Loss, Comorbidities, and Biochemical Outcomes From Randomized Controlled Trials – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Long-term impact of bariatric surgery on glycemic control and glucose-lowering therapy for people with type 2 diabetes: population-based cohort study – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Obesity, Cancer, and Risk Reduction with Bariatric Surgery – Read more
Author: Dr. Ari Doumouras, et al.
Posterior Mesorectal Thickness as a Predictor of Increased Operative Time in Rectal Cancer Surgery – Read more
Authors: Dr. Karim Ramji, Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Selective Opioid Antagonists Following Bowel Resection for Prevention of Postoperative Ileus: A Systematic Review and Meta-analysis – Read more
Author: Dr. Karim Ramji, et al.
The Impact of Bariatric Surgery on Diabetic Retinopathy: A Systematic Review and Meta-Analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The role of bariatric surgery on kidney transplantation: A systematic review and meta-analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
2020
A Longitudinal Analysis of Wait Times for Bariatric Surgery in a Publicly Funded, Regionalized Bariatric Care System – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Association Between Bariatric Surgery and All-Cause Mortality: A Population-Based Matched Cohort Study in a Universal Health Care System – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Association of Roux-en-Y Gastric Bypass With Postoperative Health Care Use and Expenditures in Canada – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Bariatric surgery before, during, and after liver transplantation: a systematic review and meta-analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Canadian consensus statement: enhanced recovery after surgery in bariatric surgery – Read more
Author: Dr. Dennis Hong, et al.
Obesity in adults: a clinical practice guideline – Read more
Author: Dr. Dennis Hong, et al.
The Effect of Bariatric Surgery on Oral Antibiotic Absorption: a Systematic Review – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The effect of surrogate procedure volume on bariatric surgery outcomes: do common laparoscopic general surgery procedures matter? – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The hidden cost of an extensive preoperative work-up: predictors of attrition after referral for bariatric surgery in a universal healthcare system – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The Role of Fecal Calprotectin in the Diagnosis of Acute Pouchitis Following IPAA for Ulcerative Colitis: A Systematic Review – Read more
Authors: Dr. Karim Ramji, Dr. Ari Doumouras, Dr. Dennis Hong, et al.
2019
Complete Resolution of Nonalcoholic Fatty Liver Disease After Bariatric Surgery: A Systematic Review and Meta-analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Diagnostic Value of C-Reactive Protein Levels in Postoperative Infectious Complications After Bariatric Surgery: a Systematic Review and Meta-Analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Intravenous Acetaminophen Versus Placebo in Post-bariatric Surgery Multimodal Pain Management: a Meta-analysis of Randomized Controlled Trials – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Metabolic outcomes after bariatric surgery for Indigenous patients in Ontario – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Single- or double-anastomosis duodenal switch versus Roux-en-Y gastric bypass as a revisional procedure for sleeve gastrectomy: A systematic review and meta-analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The effect of distance on short-term outcomes in a regionalized, publicly funded bariatric surgery model – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The impact of bariatric surgery on urinary incontinence: a systematic review and meta-analysis – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The value of surgical experience: excess costs associated with the Roux-en-Y gastric bypass learning curve – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
2018
Bariatric Surgery in the Elderly Is Associated with Similar Surgical Risks and Significant Long-Term Health Benefits – Read more
Author: Dr. Dennis Hong, et al.
Mastery in Bariatric Surgery: The Long-term Surgeon Learning Curve of Roux-en-Y Gastric Bypass – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The effect of omentectomy added to bariatric surgery on metabolic outcomes: a systematic review and meta-analysis of randomized controlled trials – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The impact of bariatric surgery on insulin-treated type 2 diabetes patients – Read more
Author: Dr. Dennis Hong, et al.
Totally endoscopic implant to effect a gastric bypass: 12-month safety and efficacy outcomes – Read more
Author: Dr. Dennis Hong, et al.
2017
A Longitudinal Analysis of Short-Term Costs and Outcomes in a Regionalized Center of Excellence Bariatric Care System – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The effect of an online referral system on referrals to bariatric surgery – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The Effect of Bariatric Surgery on Mobility, Health-Related Quality of Life, Healthcare Resource Utilization, and Employment Status – Read more
Author: Dr. Dennis Hong, et al.
The effect of health system factors on outcomes and costs after bariatric surgery in a universal healthcare system: a national cohort study of bariatric surgery in Canada – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The impact of a standardized program on short and long-term outcomes in bariatric surgery – Read more
Author: Dr. Dennis Hong, et al.
The role of routine abdominal drainage after bariatric surgery: a metabolic and bariatric surgery accreditation and quality improvement program study – Read more
Author: Dr. Ari Doumouras, et al.
2016
30-Day readmission after bariatric surgery in a publicly funded regionalized center of excellence system – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
A comparison of 30-day versus 90-day proton pump inhibitor therapy in prevention of marginal ulcers after laparoscopic Roux-en-Y gastric bypass – Read more
Author: Dr. Dennis Hong, et al.
A population-based analysis of the drivers of short-term costs after bariatric surgery within a publicly funded regionalized center of excellence system – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Comparison of Clinical and Economic Outcomes Between Robotic, Laparoscopic, and Open Rectal Cancer Surgery: Early Experience at a Tertiary Care Center – Read more
Author: Dr. Karim Ramji, et al.
Outcomes of the Ontario Bariatric Network: a cohort study – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
Regional Variations in the Public Delivery of Bariatric Surgery: An Evaluation of the Center of Excellence Model – Read more
Authors: Dr. Ari Doumouras, Dr. Dennis Hong, et al.
The Neutrophil-to-Lymphocyte Ratio Predicts Major Perioperative Complications in Patients Undergoing Colorectal Surgery – Read more
Author: Dr. Karim Ramji, et al.
2015
Prophylactic PPI help reduce marginal ulcers after gastric bypass surgery: a systematic review and meta-analysis of cohort studies – Read more
Author: Dr. Dennis Hong, et al.
2014
2013
Laparoscopic conversion of laparoscopic Roux-en-Y gastric bypass to laparoscopic sleeve gastrectomy for intractable dumping syndrome and excessive weight loss – Read more
Author: Dr. Dennis Hong, et al.
Omentectomy added to Roux-en-Y gastric bypass surgery: a randomized, controlled trial – Read more
Author: Dr. Dennis Hong, et al.
Revisional surgery after failed laparoscopic adjustable gastric banding: a systematic review – Read more
Author: Dr. Dennis Hong, et al.
2007
Comparative study between laparoscopic adjustable gastric banding and laparoscopic gastric bypass: single-institution, 5-year experience in bariatric surgery – Read more
Author: Dr. Dennis Hong, et al.
2005
Laparoscopic adjustable gastric banding versus laparoscopic gastric bypass for morbid obesity: a single-institution comparison study of early results – Read more
Author: Dr. Dennis Hong, et al.
2004
Manometric abnormalities and gastroesophageal reflux disease in the morbidly obese – Read more
Author: Dr. Dennis Hong, et al.