Research

The Ontario Bariatric Network has a strong commitment to evidence-based research to study obesity and bariatric treatment through high-impact studies. Research conducted by over 100 researchers and scientists across the OBN continues to play pivotal role in better understanding obesity, the risks and benefits of bariatric surgery, medical treatment of bariatric patients, and identifying practices and health service areas that require optimization and improvement. Research conducted has been used to inform decision makers and direct policy on the optimal treatment and management of severe obesity to achieve the goal of more efficient patient treatment.

The OBN Research Task Force meets monthly to discuss current studies and new research ideas. The goal of the task force is to create a research collaborative to facilitate multi-centre trials to better understand obesity and obesity treatment. If you have any questions or research ideas, please contact our OBN Research Task Force : kbarlow@stjoes.ca

Holmes, S., Sarma, S., Campbell, S., Azab, A., Qiang, J., & Mukerji, G. (2022). Gaps in Referral to Bariatric Surgery for Patients With Type 2 Diabetes Seen in Endocrinology Clinics. Canadian journal of diabetes, S1499-2671(22)00141-1. Advance online publication. https://doi.org/10.1016/j.jcjd.2022.06.005

Roach, E., de la Maza, L., Rieder, S., Vigneswaran, L., Maeda, A., Okrainec, A., & D Jackson, T. (2022). Cost of postoperative complications after general surgery at a major Canadian academic centre. International journal for quality in health care : journal of the International Society for Quality in Health Care, 34(4), mzac075. https://doi.org/10.1093/intqhc/mzac075

Kavanagh, M. E., Chiavaroli, L., Glenn, A. J., Heijmans, G., Grant, S. M., Chow, C. M., Josse, R. G., Malik, V. S., Watson, W., Lofters, A., Holmes, C., Rackal, J., Srichaikul, K., Sherifali, D., Snelgrove-Clarke, E., Udell, J. A., Juni, P., Booth, G. L., Farkouh, M. E., Leiter, L. A., … Sievenpiper, J. L. (2022). A Web-Based Health Application to Translate Nutrition Therapy for Cardiovascular Risk Reduction in Primary Care (PortfolioDiet.app): Quality Improvement and Usability Testing Study. JMIR human factors, 9(2), e34704. https://doi.org/10.2196/34704

Zevin, B., Sivapalan, N., Chan, L., Cofie, N., Dalgarno, N., & Barber, D. (2022). Factors influencing primary care provider referral for bariatric surgery: Systematic review. Canadian family physician Medecin de famille canadien, 68(3), e107–e117. https://doi.org/10.46747/cfp.6803e107

Dineley, B., Munro, S., Norman, W. V., Zevin, B., Hong, D., Katiraee, B., Fitzsimmons, B., & Renner, R. (2022). Contraceptive counselling in 3 Canadian bariatric surgery clinics: a multicentre qualitative study of the experiences of patients and health care providers. CMAJ open, 10(1), E255–E261. https://doi.org/10.9778/cmajo.20200304

Ahmed MM, Tian C, Lu J, Lee Y. Total Intravenous Anesthesia Versus Inhalation Anesthesia on Postoperative Analgesia and Nausea and Vomiting After Bariatric Surgery: A Systematic Review and Meta-Analysis. Asian J Anesthesiol. 2021 Dec 1;59(4):135-151. doi: 10.6859/aja.202112_59(4).0002

Barber, D., Morkem, R., Dalgarno, N., Houlden, R., Smith, K., Anvari, M., & Zevin, B. (2021). Patients eligible and referred for bariatric surgery in southeastern Ontario: Retrospective cohort study. Canadian family physician Medecin de famille canadien, 67(1), e31–e40. https://doi.org/10.46747/cfp.6701e31

Zevin, B., Almakky, M., Mancini, U., & Robertson, D. I. (2022). Digital approach to informed consent in bariatric surgery: a randomized controlled trial. Surgical endoscopy, 36(1), 809–816. https://doi.org/10.1007/s00464-020-08277-x

Elnahas, A. I., Doumouras, A. G., Anvari, M., Schlachta, C. M., McClure, A., Alkhamesi, N. A., Hawel, J. D., & Urbach, D. R. (2021). Access to bariatric surgery among older patients in a publicly funded regionalized care system. Surgical endoscopy, 35(12), 6990–6997. https://doi.org/10.1007/s00464-020-08212-0

Tarride, J. E., Doumouras, A. G., Hong, D., Paterson, J. M., Tibebu, S., Perez, R., Ma, J., Taylor, V. H., Xie, F., Boudreau, V., Pullenayegum, E., Urbach, D. R., & Anvari, M. (2020). Association of Roux-en-Y Gastric Bypass With Postoperative Health Care Use and Expenditures in Canada. JAMA surgery, 155(9), e201985. https://doi.org/10.1001/jamasurg.2020.1985

Doumouras, A. G., Albacete, S., Mann, A., Gmora, S., Anvari, M., & Hong, D. (2020). A Longitudinal Analysis of Wait Times for Bariatric Surgery in a Publicly Funded, Regionalized Bariatric Care System. Obesity surgery, 30(3), 961–968. https://doi.org/10.1007/s11695-019-04259-8

Doumouras, A. G., Lee, Y., Babe, G., Gmora, S., Tarride, J. E., Hong, D., & Anvari, M. (2020). The hidden cost of an extensive preoperative work-up: predictors of attrition after referral for bariatric surgery in a universal healthcare system. Surgical endoscopy, 34(2), 988–995. https://doi.org/10.1007/s00464-019-06894-9

Hagen, J., Klein, L., Miller, E., & Solomon, S. (2020). Leveraging Digital Infrastructure for Data Analysis: An Example in Bariatric Surgery. Healthcare quarterly (Toronto, Ont.), 23(SP), 9–13. https://doi.org/10.12927/hcq.2020.26177

Santiago, V. A., Warwick, K., Ratnakumarasuriyar, S., Oyewumi, A., Robinson, S., & Sockalingam, S. (2019). Evaluation of a Patient-Care Planning Intervention to Improve Appointment Attendance by Adults After Bariatric Surgery. Canadian journal of diabetes, 43(1), 59–66. https://doi.org/10.1016/j.jcjd.2018.05.003

Zhang, J. C., Tomlinson, G., Wnuk, S., Sockalingam, S., & Cram, P. (2019). Disparities in Receipt of Bariatric Surgery in Canada: An Analysis of Data From an Ontario Bariatric Surgery Referral Center. Medical care, 57(9), 723–727. https://doi.org/10.1097/MLR.0000000000001163

Doumouras, A. G., Saleh, F., & Hong, D. (2019). The effect of distance on short-term outcomes in a regionalized, publicly funded bariatric surgery model. Surgical endoscopy, 33(4), 1167–1173. https://doi.org/10.1007/s00464-018-6383-x

Prabhu, K. L., Okrainec, A., Maeda, A., Saskin, R., Urbach, D., Bell, C. M., & Jackson, T. D. (2018). Utilization of Public System for Gastric Bands Placed by Private Providers: a 4-Year Population-Based Analysis in Ontario, Canada. Obesity surgery, 28(9), 2979–2982. https://doi.org/10.1007/s11695-018-3342-5

Doumouras, A. G., Anvari, S., Breau, R., Anvari, M., Hong, D., & Gmora, S. (2017). The effect of an online referral system on referrals to bariatric surgery. Surgical endoscopy, 31(12), 5127–5134. https://doi.org/10.1007/s00464-017-5578-x

Doumouras, A. G., Saleh, F., Sharma, A. M., Anvari, S., Gmora, S., Anvari, M., & Hong, D. (2017). Geographic and socioeconomic factors affecting delivery of bariatric surgery across high- and low-utilization healthcare systems. The British journal of surgery, 104(7), 891–897. https://doi.org/10.1002/bjs.10517

Doumouras, A. G., Saleh, F., Anvari, S., Gmora, S., Anvari, M., & Hong, D. (2017). A Longitudinal Analysis of Short-Term Costs and Outcomes in a Regionalized Center of Excellence Bariatric Care System. Obesity surgery, 27(11), 2811–2817. https://doi.org/10.1007/s11695-017-2707-5

Doumouras, A. G., Saleh, F., Anvari, S., Gmora, S., Anvari, M., & Hong, D. (2017). 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. Surgical endoscopy, 31(11), 4816–4823. https://doi.org/10.1007/s00464-017-5559-0

Wharton, S., Serodio, K. J., Kuk, J. L., Sivapalan, N., Craik, A., & Aarts, M. A. (2016). Interest, views and perceived barriers to bariatric surgery in patients with morbid obesity. Clinical obesity, 6(2), 154–160. https://doi.org/10.1111/cob.12131

Aird, L. N., Hong, D., Gmora, S., Breau, R., & Anvari, M. (2017). The impact of a standardized program on short and long-term outcomes in bariatric surgery. Surgical endoscopy, 31(2), 801–808. https://doi.org/10.1007/s00464-016-5035-2

Bhatti, J. A., Nathens, A. B., Thiruchelvam, D., & Redelmeier, D. A. (2016). Weight loss surgery and subsequent emergency care use: a population-based cohort study. The American journal of emergency medicine, 34(5), 861–865. https://doi.org/10.1016/j.ajem.2016.02.007

Doumouras, A. G., Saleh, F., Gmora, S., Anvari, M., & Hong, D. (2016). Regional Variations in the Public Delivery of Bariatric Surgery: An Evaluation of the Center of Excellence Model. Annals of surgery, 263(2), 306–311. https://doi.org/10.1097/SLA.0000000000001129

Doumouras, A. G., Saleh, F., & Hong, D. (2016). 30-Day readmission after bariatric surgery in a publicly funded regionalized center of excellence system. Surgical endoscopy, 30(5), 2066–2072. https://doi.org/10.1007/s00464-015-4455-8

Doumouras, A. G., Saleh, F., Tarride, J. E., & Hong, D. (2016). A population-based analysis of the drivers of short-term costs after bariatric surgery within a publicly funded regionalized center of excellence system. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 12(5), 1023–1031. https://doi.org/10.1016/j.soard.2016.02.016

Elnahas, A., Jackson, T. D., Okrainec, A., Austin, P. C., Bell, C. M., & Urbach, D. R. (2016). The effect of the Ontario Bariatric Network on health services utilization after bariatric surgery: a retrospective cohort study. CMAJ open, 4(3), E489–E495. https://doi.org/10.9778/cmajo.20160042

Hirpara, D. H., Cleghorn, M. C., Kwong, J., Saleh, F., Sockalingam, S., Quereshy, F. A., Okrainec, A., & Jackson, T. D. (2016). Perception and Awareness of Bariatric Surgery in Canada: a National Survey of General Surgeons. Obesity surgery, 26(8), 1799–1805. https://doi.org/10.1007/s11695-015-1975-1

Zhang, M. W., Ho, R. C., Hawa, R., & Sockalingam, S. (2016). Analysis of the Information Quality of Bariatric Surgery Smartphone Applications Using the Silberg Scale. Obesity surgery, 26(1), 163–168. https://doi.org/10.1007/s11695-015-1890-5

Diamant, A., Cleghorn, M. C., Milner, J., Sockalingam, S., Okrainec, A., Jackson, T. D., & Quereshy, F. A. (2015). Patient and operational factors affecting wait times in a bariatric surgery program in Toronto: a retrospective cohort study. CMAJ open, 3(3), E331–E337. https://doi.org/10.9778/cmajo.20150020

Zhang, M. W., Ho, R. C., Cassin, S. E., Hawa, R., & Sockalingam, S. (2015). Online and smartphone based cognitive behavioral therapy for bariatric surgery patients: Initial pilot study. Technology and health care : official journal of the European Society for Engineering and Medicine, 23(6), 737–744. https://doi.org/10.3233/THC-151026

Zhang, M. W., Ho, R. C., Hawa, R., & Sockalingam, S. (2015). Pilot implementation and user preferences of a Bariatric After-care application. Technology and health care : official journal of the European Society for Engineering and Medicine, 23(6), 729–736. https://doi.org/10.3233/THC-151025

Roach, E., Laplante, S., Stogryn, S., Maeda, A., Jackson, T., & Okrainec, A. (2022). Weight loss outcomes for patients undergoing conversion to Roux-en-Y-gastric bypass after sleeve gastrectomy. Surgical endoscopy, 10.1007/s00464-022-09506-1. Advance online publication. https://doi.org/10.1007/s00464-022-09506-1

Doumouras, A. G., Lovrics, O., Paterson, J. M., Sutradhar, R., Paszat, L., Sivapathasundaram, B., Tarride, J. E., & Anvari, M. (2022). Bariatric Surgery and Breast Cancer Incidence: a Population-Based, Matched Cohort Study. Obesity surgery, 32(4), 1261–1269. https://doi.org/10.1007/s11695-022-05946-9

Kaplan, U., Zohdy, W., Gmora, S., Hong, D., & Anvari, M. (2022). What patient factors influence bariatric surgery outcomes? A multiple regression analysis of Ontario Bariatric Registry data. Canadian journal of surgery. Journal canadien de chirurgie, 65(1), E66–E72. https://doi.org/10.1503/cjs.018319

Chao, G. F., & Urbach, D. R. (2022). Does Bariatric Surgery Prevent Cancer?. Annals of surgery, 275(1), 7–8. https://doi.org/10.1097/SLA.0000000000005171.

Deghan Manshadi, S., Dehghan, K., Robertson, D. I., Reimer, C., & Zevin, B. (2022). Safety and outcomes of performing laparoscopic Roux-en-Y gastric bypass and sleeve gastrectomy at an ambulatory site of a tertiary care hospital in Ontario. Canadian journal of surgery. Journal canadien de chirurgie, 65(1), E38–E44. https://doi.org/10.1503/cjs.007120

Alibhai, K., Churchill, I., Vause, T., & Lochnan, H. A. (2022). The impact of bariatric surgery on assisted reproductive technology outcomes: a systematic review protocol. Systematic reviews, 11(1), 1. https://doi.org/10.1186/s13643-021-01870-8

Barthold, D., Brouwer, E., Barton, L. J., Arterburn, D. E., Basu, A., Courcoulas, A., Crawford, C. L., Fedorka, P. N., Fischer, H., Kim, B. B., Mun, E. C., Murali, S. B., Reynolds, K., Yoon, T. K., Zane, R. E., & Coleman, K. J. (2022). Minimum Threshold of Bariatric Surgical Weight Loss for Initial Diabetes Remission. Diabetes care, 45(1), 92–99. https://doi.org/10.2337/dc21-0714.

Lee, Y., Anvari, S., Chu, M. M., Lovrics, O., Khondker, A., Malhan, R., Aditya, I., Doumouras, A. G., Walsh, M., & Hong, D. (2022). Improvement of kidney function in patients with chronic kidney disease and severe obesity after bariatric surgery: A systematic review and meta-analysis. Nephrology (Carlton, Vic.), 27(1), 44–56. https://doi.org/10.1111/nep.13958

Tian, C., Hawryluck, L., Tomlinson, G., Chung, F., Beattie, S., Miller, M., Hassan, N., Wong, D. T., Wong, J., Hudson, J., Jackson, T., & Singh, M. (2022). Impact of a continuous enhanced cardio-respiratory monitoring pathway on cardio-respiratory complications after bariatric surgery: A retrospective cohort study. Journal of clinical anesthesia, 77, 110639. https://doi.org/10.1016/j.jclinane.2021.110639.

Fecso, A. B., Di Palma, A., Maeda, A., Englesakis, M., Jackson, T., & Okrainec, A. (2021). Operative management of recalcitrant marginal ulcers following laparoscopic Roux-en-Y gastric bypass for morbid obesity: a systematic review. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 17(12), 2082–2090. https://doi.org/10.1016/j.soard.2021.07.017

Iranmanesh, P., Boudreau, V., Ramji, K., Barlow, K., Lovrics, O., & Anvari, M. (2022). Outcomes of bariatric surgery in elderly patients: a registry-based cohort study with 3-year follow-up. International journal of obesity (2005), 46(3), 574–580. https://doi.org/10.1038/s41366-021-01031-w

Legatto, T., Taylor, V. H., Kidane, B., Anvari, M., & Hensel, J. M. (2022). The Impact of Psychiatric History and Peri-operative Psychological Distress on Weight Loss Outcomes 1 Year After Bariatric Surgery. Obesity surgery, 32(2), 325–333. https://doi.org/10.1007/s11695-021-05781-4

Dash, S., Everett, K., Jackson, T., Okrainec, A., Urbach, D. R., Sockalingam, S., Shah, B. R., & Farkouh, M. E. (2021). Cardiorenal outcomes in eligible patients referred for bariatric surgery. Obesity (Silver Spring, Md.), 29(12), 2035–2043. https://doi.org/10.1002/oby.23294.

Elnahas, A. I., Reid, J. N., Lam, M., Doumouras, A. G., Anvari, M., Schlachta, C. M., Alkhamesi, N. A., Hawel, J., & Urbach, D. R. (2022). Risk factors for abdominal reoperations in bariatric patients. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 18(2), 233–240. https://doi.org/10.1016/j.soard.2021.10.016

Youssef, A., Mylopoulos, M., Maunder, R., Wiljer, D., Cassin, S. E., Wnuk, S., Leung, S., & Sockalingam, S. (2021). Understanding bariatric patients' experiences of self-management post-surgery: A qualitative study. Clinical obesity, 11(5), e12473. https://doi.org/10.1111/cob.12473

Reynolds, K., Barton, L. J., Basu, A., Fischer, H., Arterburn, D. E., Barthold, D., Courcoulas, A., Crawford, C. L., Kim, B. B., Fedorka, P. N., Mun, E. C., Murali, S. B., Zane, R. E., & Coleman, K. J. (2021). Comparative Effectiveness of Gastric Bypass and Vertical Sleeve Gastrectomy for Hypertension Remission and Relapse: The ENGAGE CVD Study. Hypertension (Dallas, Tex. : 1979), 78(4), 1116–1125. https://doi.org/10.1161/HYPERTENSIONAHA.120.16934

Yu, C. W., Park, L. J., Pinto, A., Ma, O. N., Lee, Y., Gupta, R., Chaudhary, V., Doumouras, A. G., & Hong, D. (2021). The Impact of Bariatric Surgery on Diabetic Retinopathy: A Systematic Review and Meta-Analysis. American journal of ophthalmology, 225, 117–127. https://doi.org/10.1016/j.ajo.2020.12.033

Atwood, M. E., Cassin, S. E., Rajaratnam, T., Hawa, R., & Sockalingam, S. (2021). The Bariatric Interprofessional Psychosocial Assessment of Suitability Scale predicts binge eating, quality of life and weight regain following bariatric surgery. Clinical obesity, 11(1), e12421. https://doi.org/10.1111/cob.12421

Bielawska, B., Ouellette-Kuntz, H., Zevin, B., Anvari, M., & Patel, S. V. (2021). Early postoperative follow-up reduces risk of late severe nutritional complications after Roux-En-Y gastric bypass: a population based study. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 17(10), 1740–1750. https://doi.org/10.1016/j.soard.2021.05.035.

Tian, C., Lee, Y., Oparin, Y., Hong, D., & Shanthanna, H. (2021). Benefits of Transversus Abdominis Plane Block on Postoperative Analgesia after Bariatric Surgery: A Systematic Review and Meta-Analysis. Pain physician, 24(5), 345–358.

Sarma, S., Sockalingam, S., & Dash, S. (2021). Obesity as a multisystem disease: Trends in obesity rates and obesity-related complications. Diabetes, obesity & metabolism, 23 Suppl 1, 3–16. https://doi.org/10.1111/dom.14290

Yang, S., Zhou, L., Chen, Y., Krewski, D., Wu Wen, S., & Xie, R. H. (2021). Maternal and neonatal outcomes in women undergoing Roux-en-Y gastric bypass: A systematic review and meta-analysis. European journal of obstetrics, gynecology, and reproductive biology, 264, 117–127. https://doi.org/10.1016/j.ejogrb.2021.07.006

Sarma, S., & Lipscombe, L. L. (2021). In obesity with T2DM, biliopancreatic diversion increased T2DM remission vs. medical and lifestyle therapy at 10 y. Annals of internal medicine, 174(6), JC70. https://doi.org/10.7326/ACPJ202106150-070

Chao, G. F., & Urbach, D. R. (2022). Does Bariatric Surgery Prevent Cancer?. Annals of surgery, 275(1), 7–8. https://doi.org/10.1097/SLA.0000000000005171

Di Palma, A., Liu, B., Maeda, A., Anvari, M., Jackson, T., & Okrainec, A. (2021). Marginal ulceration following Roux-en-Y gastric bypass: risk factors for ulcer development, recurrence and need for revisional surgery. Surgical endoscopy, 35(5), 2347–2353. https://doi.org/10.1007/s00464-020-07650-0

Doumouras, A. G., Lee, Y., Paterson, J. M., Gerstein, H. C., Shah, B. R., Sivapathasundaram, B., Tarride, J. E., Anvari, M., & Hong, D. (2021). Association Between Bariatric Surgery and Major Adverse Diabetes Outcomes in Patients With Diabetes and Obesity. JAMA network open, 4(4), e216820. https://doi.org/10.1001/jamanetworkopen.2021.6820

Doumouras, A. G., Wong, J. A., Paterson, J. M., Lee, Y., Sivapathasundaram, B., Tarride, J. E., Thabane, L., Hong, D., Yusuf, S., & Anvari, M. (2021). Bariatric Surgery and Cardiovascular Outcomes in Patients With Obesity and Cardiovascular Disease:: A Population-Based Retrospective Cohort Study. Circulation, 143(15), 1468–1480. https://doi.org/10.1161/CIRCULATIONAHA.120.052386

Lovrics O, Butt J, Lee Y, Lovrics P, Boudreau V, Anvari M, Hong D, Doumouras AG. The effect of bariatric surgery on breast cancer incidence and characteristics: A meta-analysis and systematic review. Am J Surg. 2021 Oct;222(4):715-722. doi: 10.1016/j.amjsurg.2021.03.016. Epub 2021 Mar 18. PMID: 33771341.

Youssef, A., Cassin, S. E., Wnuk, S., Leung, S., Jackson, T., & Sockalingam, S. (2021). The impact of COVID-19 pandemic on bariatric patients' self-management post-surgery. Appetite, 162, 105166. https://doi.org/10.1016/j.appet.2021.105166

Imtiaz, R., Doumouras, A. G., Hong, D., Anvari, M., & Shah, B. R. (2021). Long-term impact of bariatric surgery on glycemic control and glucose-lowering therapy for people with type 2 diabetes: population-based cohort study. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 17(6), 1049–1056. https://doi.org/10.1016/j.soard.2021.02.015

Jung, F., Lee, Y., Manzoor, S., Hong, D., & Doumouras, A. G. (2021). Effects of Perioperative Cannabis Use on Bariatric Surgical Outcomes: a Systematic Review. Obesity surgery, 31(1), 299–306. https://doi.org/10.1007/s11695-020-04962-x

Lee, Y., Doumouras, A. G., Yu, J., Aditya, I., Gmora, S., Anvari, M., & Hong, D. (2021). 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. Annals of surgery, 273(1), 66–74. https://doi.org/10.1097/SLA.0000000000003671

Malik, P., Doumouras, A. G., Malhan, R. S., Lee, Y., Boudreau, V., Barlow, K., Karpinski, M., & Anvari, M. (2021). Obesity, Cancer, and Risk Reduction with Bariatric Surgery. The Surgical clinics of North America, 101(2), 239–254. https://doi.org/10.1016/j.suc.2020.12.003

Nowak, K., Di Palma, A., Chieu, K., Quereshy, F., Jackson, T., Okrainec, A., Serra, S., & Chetty, R. (2021). Histologic and Cost-Benefit Analysis of Laparoscopic Sleeve Gastrectomy Specimens Performed for Morbid Obesity. Archives of pathology & laboratory medicine, 145(3), 365–370. https://doi.org/10.5858/arpa.2020-0084-OA

Welbourn, R., Hollyman, M., Kinsman, R., Dixon, J., Cohen, R., Morton, J., Ghaferi, A., Higa, K., Ottosson, J., Pattou, F., Al-Sabah, S., Anvari, M., Himpens, J., Liem, R., Våge, V., Walton, P., Brown, W., & Kow, L. (2021). Bariatric-Metabolic Surgery Utilisation in Patients With and Without Diabetes: Data from the IFSO Global Registry 2015-2018. Obesity surgery, 31(6), 2391–2400. https://doi.org/10.1007/s11695-021-05280-6.

Anvari, S., Samarasinghe, Y., Alotaiby, N., Tiboni, M., Crowther, M., & Doumouras, A. G. (2021). Iron supplementation following bariatric surgery: A systematic review of current strategies. Obesity reviews : an official journal of the International Association for the Study of Obesity, 22(9), e13268. https://doi.org/10.1111/obr.13268.

Doumouras, A. G., Hong, D., Lee, Y., Tarride, J. E., Paterson, J. M., & Anvari, M. (2020). Association Between Bariatric Surgery and All-Cause Mortality: A Population-Based Matched Cohort Study in a Universal Health Care System. Annals of internal medicine, 173(9), 694–703. https://doi.org/10.7326/M19-3925.

Anvari, S., Lee, Y., Lam, M., Doumouras, A. G., & Hong, D. (2020). The Effect of Bariatric Surgery on Oral Antibiotic Absorption: a Systematic Review. Obesity surgery, 30(8), 2883–2892. https://doi.org/10.1007/s11695-020-04623-z.

Lee, Y., Anvari, S., Sam Soon, M., Tian, C., Wong, J. A., Hong, D., Anvari, M., & Doumouras, A. G. (2022). Bariatric Surgery as a Bridge to Heart Transplantation in Morbidly Obese Patients: A Systematic Review and Meta-Analysis. Cardiology in review, 30(1), 1–7. https://doi.org/10.1097/CRD.0000000000000346.

Schwenger, K., Alghamdi, M. M., Ghorbani, Y., Jackson, T. D., Okrainec, A., & Allard, J. P. (2020). Hyposalivation is prevalent in bariatric patients but improves after surgery. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 16(10), 1407–1413. https://doi.org/10.1016/j.soard.2020.06.005.

Jarrar, A., Budiansky, A., Eipe, N., Walsh, C., Kolozsvari, N., Neville, A., & Mamazza, J. (2020). Randomised, double-blinded, placebo-controlled trial to investigate the role of laparoscopic transversus abdominis plane block in gastric bypass surgery: a study protocol. BMJ open, 10(6), e025818. https://doi.org/10.1136/bmjopen-2018-025818.

Schwenger, K., Ghorbani, Y., Li, C., Fischer, S. E., Jackson, T. D., Okrainec, A., & Allard, J. P. (2020). Obstructive Sleep Apnea and Non-alcoholic Fatty Liver Disease in Obese Patients Undergoing Bariatric Surgery. Obesity surgery, 30(7), 2572–2578. https://doi.org/10.1007/s11695-020-04514-3

Youssef, A., Keown-Stoneman, C., Maunder, R., Wnuk, S., Wiljer, D., Mylopoulos, M., & Sockalingam, S. (2020). Differences in physical and mental health-related quality of life outcomes 3 years after bariatric surgery: a group-based trajectory analysis. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 16(11), 1837–1849. https://doi.org/10.1016/j.soard.2020.06.014

Bielawska, B., Ouellette-Kuntz, H., Patel, S. V., Anvari, M., & Zevin, B. (2020). Severe nutritional complications after bariatric surgery in Ontario adults: a population-based descriptive study. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 16(11), 1784–1793. https://doi.org/10.1016/j.soard.2020.06.028

Gowanlock, Z., Lezhanska, A., Conroy, M., Crowther, M., Tiboni, M., Mbuagbaw, L., & Siegal, D. M. (2020). Iron deficiency following bariatric surgery: a retrospective cohort study. Blood advances, 4(15), 3639–3647. https://doi.org/10.1182/bloodadvances.2020001880

Hunt, K. D., Doumouras, A. G., Lee, Y., Gmora, S., Anvari, M., & Hong, D. (2020). The effect of surrogate procedure volume on bariatric surgery outcomes: do common laparoscopic general surgery procedures matter?. Surgical endoscopy, 34(3), 1278–1284. https://doi.org/10.1007/s00464-019-06897-6

Lee, Y., Tian, C., Lovrics, O., Soon, M. S., Doumouras, A. G., Anvari, M., & Hong, D. (2020). Bariatric surgery before, during, and after liver transplantation: a systematic review and meta-analysis. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 16(9), 1336–1347. https://doi.org/10.1016/j.soard.2020.05.012.

Tian, C., Maeda, A., Okrainec, A., Anvari, M., & Jackson, T. (2020). Impact of preoperative opioid use on health outcomes after bariatric surgery. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 16(6), 768–776. https://doi.org/10.1016/j.soard.2020.02.008.

Li, A., Eshaghpour, A., Tseng, E. K., Douketis, J. D., Anvari, M., Tiboni, M., Siegal, D. M., Ikesaka, R. T., & Crowther, M. A. (2021). Weight-adjusted tinzaparin for venous thromboembolism prophylaxis in bariatric surgery patients weighing 160 kg or more. Thrombosis research, 198, 1–6. https://doi.org/10.1016/j.thromres.2020.11.021

Restivo, M. R., Hall, G. B., Frey, B. N., McKinnon, M. C., & Taylor, V. H. (2020). Neural correlates of verbal recognition memory in obese adults with and without major depressive disorder. Brain and behavior, 10(12), e01848. Advance online publication. https://doi.org/10.1002/brb3.1848.

Hawkins, M., Leung, S. E., Lee, A., Wnuk, S., Cassin, S., Hawa, R., & Sockalingam, S. (2020). Psychiatric Medication Use and Weight Outcomes One Year After Bariatric Surgery. Psychosomatics, 61(1), 56–63. https://doi.org/10.1016/j.psym.2019.10.009.

Santiago, V. A., Cassin, S. E., Wnuk, S., Du, C., Hawa, R., Parikh, S. V., & Sockalingam, S. (2021). "If you're offered help, take it": A qualitative study examining bariatric patients' experience of telephone-based cognitive behavioural therapy. Clinical obesity, 11(2), e12431. https://doi.org/10.1111/cob.12431.

Di Palma, A., Alhabdan, S., Maeda, A., Mattu, F., Chetty, R., Serra, S., Quereshy, F., Jackson, T., & Okrainec, A. (2020). Unexpected histopathological findings after sleeve gastrectomy. Surgical endoscopy, 34(5), 2158–2163. https://doi.org/10.1007/s00464-019-07002-7.

Sockalingam, S., Leung, S. E., Hawa, R., Wnuk, S., Parikh, S. V., Jackson, T., & Cassin, S. E. (2019). Telephone-based cognitive behavioural therapy for female patients 1-year post-bariatric surgery: A pilot study. Obesity research & clinical practice, 13(5), 499–504. https://doi.org/10.1016/j.orcp.2019.07.003.

Lee, Y., Yu, J., Doumouras, A. G., Ashoorion, V., Gmora, S., Anvari, M., & Hong, D. (2019). Intravenous Acetaminophen Versus Placebo in Post-bariatric Surgery Multimodal Pain Management: a Meta-analysis of Randomized Controlled Trials. Obesity surgery, 29(4), 1420–1428. https://doi.org/10.1007/s11695-019-03732-8.

Lovrics, O., Doumouras, A. G., Gmora, S., Anvari, M., & Hong, D. (2019). Metabolic outcomes after bariatric surgery for Indigenous patients in Ontario. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 15(8), 1340–1347. https://doi.org/10.1016/j.soard.2019.05.035.

Lee, Y., Yu, J., Tikkinen, K., Pędziwiatr, M., Major, P., Aditya, I., Krakowsky, Y., Doumouras, A. G., Gmora, S., Anvari, M., & Hong, D. (2019). The impact of bariatric surgery on urinary incontinence: a systematic review and meta-analysis. BJU international, 124(6), 917–934. https://doi.org/10.1111/bju.14829

Lee, Y., McKechnie, T., Doumouras, A. G., Handler, C., Eskicioglu, C., Gmora, S., Anvari, M., & Hong, D. (2019). Diagnostic Value of C-Reactive Protein Levels in Postoperative Infectious Complications After Bariatric Surgery: a Systematic Review and Meta-Analysis. Obesity surgery, 29(7), 2022–2029. https://doi.org/10.1007/s11695-019-03832-5.

Lee, Y., Ellenbogen, Y., Doumouras, A. G., Gmora, S., Anvari, M., & Hong, D. (2019). 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. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 15(4), 556–566. https://doi.org/10.1016/j.soard.2019.01.022.

Houlden, R. L., Yen, J. L., & Moore, S. (2018). Effectiveness of an Interprofessional Glycemic Optimization Clinic on Preoperative Glycated Hemoglobin Levels for Adult Patients With Type 2 Diabetes Undergoing Bariatric Surgery. Canadian journal of diabetes, 42(5), 514–519. https://doi.org/10.1016/j.jcjd.2017.12.011.

Anvari, M., Lemus, R., & Breau, R. (2018). A Landscape of Bariatric Surgery in Canada: For the Treatment of Obesity, Type 2 Diabetes and Other Comorbidities in Adults. Canadian journal of diabetes, 42(5), 560–567. https://doi.org/10.1016/j.jcjd.2017.12.007.

Honarmand, K., Chetty, K., Vanniyasingam, T., Anvari, M., & Chetty, V. T. (2017). Type 2 diabetes remission rates 1-year post-Roux-en-Y gastric bypass and validation of the DiaRem score: the Ontario Bariatric Network experience. Clinical obesity, 7(3), 176–182. https://doi.org/10.1111/cob.12189.

Saleh, F., Doumouras, A. G., Gmora, S., Anvari, M., & Hong, D. (2016). Outcomes the Ontario Bariatric Network: a cohort study. CMAJ open, 4(3), E383–E389. https://doi.org/10.9778/cmajo.20150112

Kuk, J. L., & Wharton, S. (2016). Differences in weight change trajectory patterns in a publicly funded adult weight management centre. Obesity science & practice, 2(2), 215–223. https://doi.org/10.1002/osp4.35.

Thiara, G., Yanofksy, R., Abdul-Kader, S., Santiago, V. A., Cassin, S., Okrainec, A., Jackson, T., Hawa, R., & Sockalingam, S. (2016). Toronto Bariatric Interprofessional Psychosocial Assessment Suitability Scale: Evaluating A New Clinical Assessment Tool for Bariatric Surgery Candidates. Psychosomatics, 57(2), 165–173. https://doi.org/10.1016/j.psym.2015.12.003.

Larjani, S., Spivak, I., Hao Guo, M., Aliarzadeh, B., Wang, W., Robinson, S., Sockalingam, S., & Aarts, M. A. (2016). Preoperative predictors of adherence to multidisciplinary follow-up care postbariatric surgery. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 12(2), 350–356. https://doi.org/10.1016/j.soard.2015.11.007.

Poole, M., Fasola, L., & Zevin, B. (2022). Management of Complications After Bariatric Surgery: a Survey of Comfort and Educational Needs of General Surgeons in Ontario, Canada. Obesity surgery, 1–10. Advance online publication. https://doi.org/10.1007/s11695-022-06095-9

Tarride, J. E., Doumouras, A. G., Hong, D., Paterson, J. M., Tibebu, S., Nguyen, F., Perez, R., Taylor, V. H., Xie, F., Boudreau, V., Pullenayegum, E., Urbach, D. R., & Anvari, M. (2021). Comparison of 4-Year Health Care Expenditures Associated With Roux-en-Y Gastric Bypass vs Sleeve Gastrectomy. JAMA network open, 4(9), e2122079. https://doi.org/10.1001/jamanetworkopen.2021.22079.

Iranmanesh, P., Boudreau, V., Barlow, K., Malik, P., Ramji, K., Gmora, S., Hong, D., & Anvari, M. (2021). Comparison of single- versus double-anastomosis duodenal switch: a single-center experience with 2-year follow-up. International journal of obesity (2005), 45(8), 1782–1789. https://doi.org/10.1038/s41366-021-00844-z.

Zevin, B., Martin, M., Dalgarno, N., Chan, L., Sivapalan, N., Houlden, R., Birtwhistle, R., Smith, K., & Barber, D. (2021). Survey of perceptions and educational needs of primary care providers regarding management of patients with class II and III obesity in Ontario, Canada. BMC family practice, 22(1), 14. https://doi.org/10.1186/s12875-020-01356-x.

Gabrielli, M. E., Saun, T. J., Jung, J. J., & Grantcharov, T. P. (2020). Assessment of 3-Dimensional vs 2-Dimensional Imaging and Technical Performance Using a Multiport Intraoperative Data Capture and Analytic System for Patients Undergoing Laparoscopic Roux-en-Y Gastric Bypass Surgery. JAMA network open, 3(1), e1920084. https://doi.org/10.1001/jamanetworkopen.2019.20084.

Ko, G., Smith, A., Cassie, S., & Zevin, B. (2019). Incidentally discovered intestinal nonrotation at time of bariatric surgery: Which operation to perform?. Surgery for obesity and related diseases : official journal of the American Society for Bariatric Surgery, 15(3), 424–430. https://doi.org/10.1016/j.soard.2018.12.036.

Doumouras, A. G., Saleh, F., Anvari, S., Gmora, S., Anvari, M., & Hong, D. (2018). Mastery in Bariatric Surgery: The Long-term Surgeon Learning Curve of Roux-en-Y Gastric Bypass. Annals of surgery, 267(3), 489–494. https://doi.org/10.1097/SLA.0000000000002180.

Doumouras, A. G., Saleh, F., Gmora, S., Anvari, M., & Hong, D. (2019). The value of surgical experience: excess costs associated with the Roux-en-Y gastric bypass learning curve. Surgical endoscopy, 33(6), 1944–1951. https://doi.org/10.1007/s00464-018-6472-x.

Taylor, V. H., Hensel, J., & Anvari, M. (2018). The impact of health discipline designation on psychological assessments prior to bariatric surgery. General hospital psychiatry, 54, 52–53. https://doi.org/10.1016/j.genhosppsych.2018.01.008.

Nguyen, N. T., Okrainec, A., Anvari, M., Smith, B., Meireles, O., Gee, D., Moran-Atkin, E., Baram-Clothier, E., & Camacho, D. R. (2018). Sleeve gastrectomy telementoring: a SAGES multi-institutional quality improvement initiative. Surgical endoscopy, 32(2), 682–687. https://doi.org/10.1007/s00464-017-5721-8.

Auspitz, M., Cleghorn, M. C., Azin, A., Sockalingam, S., Quereshy, F. A., Okrainec, A., & Jackson, T. D. (2016). Knowledge and Perception of Bariatric Surgery Among Primary Care Physicians: a Survey of Family Doctors in Ontario. Obesity surgery, 26(9), 2022–2028. https://doi.org/10.1007/s11695-016-2055-x.

Gunaratne, K., Cleghorn, M. C., & Jackson, T. D. (2016). The Surgeon Cost Report Card: A Novel Cost-Performance Feedback Tool. JAMA surgery, 151(1), 79–80. https://doi.org/10.1001/jamasurg.2015.2666.

Lovrics O, Doumouras AG, Gmora S, Anvari M, Hong D. Metabolic outcomes after bariatric surgery for Indigenous patients in Ontario. Surg Obes Relat Dis. 2019 Aug;15(8):1340-1347. doi: 10.1016/j.soard.2019.05.035. Epub 2019 Jun 4. PMID: 31300284.

Iranmanesh P, Barlow K, Anvari M. The effect of bariatric surgery on opioid consumption in patients with obesity: a registry-based cohort study. Surg Obes Relat Dis. 2023 Sep;19(9):952-961. doi: 10.1016/j.soard.2023.03.004. Epub 2023 Mar 16. PMID: 37121852.

Roach E, Laplante S, Stogryn S, Maeda A, Jackson T, Okrainec A. Weight loss outcomes for patients undergoing conversion to Roux-en-Y-gastric bypass after sleeve gastrectomy. Surg Endosc. 2023 Apr;37(4):3208-3214. doi: 10.1007/s00464-022-09506-1. Epub 2022 Aug 18. PMID: 35982286.

Kaplan U, Zohdy W, Gmora S, Hong D, Anvari M. What patient factors influence bariatric surgery outcomes? A multiple regression analysis of Ontario Bariatric Registry data. Can J Surg. 2022 Feb 3;65(1):E66-E72. doi: 10.1503/cjs.018319. PMID: 35115319; PMCID: PMC8820836.

Legatto T, Taylor VH, Kidane B, Anvari M, Hensel JM. The Impact of Psychiatric History and Peri-operative Psychological Distress on Weight Loss Outcomes 1 Year After Bariatric Surgery. Obes Surg. 2022 Feb;32(2):325-333. doi: 10.1007/s11695-021-05781-4. Epub 2021 Nov 16. PMID: 34783959.

Research

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Clinical Outcomes

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Registry Studies