Risk of Any Hypoglycemia with New Antihyperglycemic Agents in Patients with Type 2 Diabetes: a Systematic Review and Meta-Analysis
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Risk of Any Hypoglycemia with New Antihyperglycemic Agents in Patients with Type 2 Diabetes: A Systematic Review and Meta-Analysis by Sanaz Kamalinia A thesis submitted in conformity with the requirements for the degree of Master of Science Institute of Medical Sciences University of Toronto © Copyright by Sanaz Kamalinia (2019) Risk of Any Hypoglycemia with New Antihyperglycemic Agents in Patients with Type 2 Diabetes: A Systematic Review and Meta- Analysis Sanaz Kamalinia Master of Science Institute of Medical Sciences University of Toronto 2019 Abstract Background : Evaluation of hypoglycemia risk relative to placebo with new antihyperglycemic agents (AHA) including the dipeptidyl peptidase-4 inhibitors (DPP4i), glucagon-like peptide-1 receptor agonists (GLP1RA) and sodium-glucose co-transporter- 2 inhibitors (SGLT2i) remains inconclusive. Objective: This systematic review and meta-analysis aimed to assess risk of any and severe hypoglycemia with new AHA relative to placebo by excluding studies with background sulfonylureas and insulin. Methods: Randomized, placebo-controlled studies, 12 weeks or greater in duration were considered for inclusion. Studies allowing background use of any other AHA, apart from metformin, were excluded. This study is registered with PROSPERO (CRD42018095458). Results: 141 studies included in the meta-analysis demonstrate that relative to placebo, risk of any and severe hypoglycemia did not significantly differ for any new AHA. ii Acknowledgments First and foremost, I wish to express my sincere gratitude to my program advisor committee members. To my supervisor Dr Tobe, thank you for accepting me as your student and presenting me with this challenge. I thoroughly enjoyed it. Especially given your positive words of encouragement and insightful guidance for every step of this journey. To my program advisory committee members, Drs Robert Josse and Baiju Shah, I am so grateful for the collaboration. As icons in your field, thank you for instilling your trust in me. A special note of appreciation to my independent reviewers Lindsay Leduc and Patrick J. Donio for taking on this massive project while in medical school. Their dedication and commitment to detail were key to the success of this analysis. It is reassuring to know the next generation of physicians will be of such high caliber. Finally, to my family. My husband and best friend Fardin, thank you for never questioning and encouraging my mid-life decision to quit my job and return to school. To my precious children, son Kayan and daughter Chloe, I am so blessed for your unconditional love. I hope this will encourage you to never stop learning. iii Contributions My supervisor, Dr Sheldon Tobe, originally conceived of the research question for the meta- analysis. My program advisor committee members including Dr Josse and Dr Shah provided instrumental support and guidance on the protocol, methodology and interpretation of the study results. They also provided valuable feedback on this thesis. Lindsay Leduc was an independent reviewer for study screening and selection phase. Pat Donio was an independent reviewer for the data extraction phase. I am truly grateful for everyone’s dedication and collaboration. iv Table of Contents Table of Contents Acknowledgments.......................................................................................................................... iii Contributions.................................................................................................................................. iv Table of Contents .............................................................................................................................v List of Tables ............................................................................................................................... xix List of Figures ................................................................................................................................xx List of Abbreviations ................................................................................................................... xxi List of Appendices ...................................................................................................................... xxii INTRODUCTION ......................................................................................................................1 TYPE 2 DIABETES ...................................................................................................................3 2.1 EPIDEMIOLOGY ................................................................................................................3 2.1.1 Global .......................................................................................................................3 2.1.2 Canada......................................................................................................................3 2.1.3 United States of America .........................................................................................4 2.1.4 Rest of the World .....................................................................................................5 2.2 PATHOPHYSIOLOGY ........................................................................................................5 2.3 RISK FACTORS ...................................................................................................................6 2.3.1 Multifactorial ...........................................................................................................6 2.3.2 Adiposity/Obesity ....................................................................................................6 2.3.3 Diet ...........................................................................................................................7 2.3.4 Particulate Matter .....................................................................................................8 2.3.5 Race..........................................................................................................................9 2.3.6 Sex/Gender ...............................................................................................................9 2.4 COMPLICATIONS ............................................................................................................11 v 2.4.1 All-Cause Mortality ...............................................................................................12 2.4.2 Cardiovascular Disease ..........................................................................................12 2.4.3 Dementia ................................................................................................................13 2.4.4 Muscle Strength .....................................................................................................14 2.4.5 Falls ........................................................................................................................15 2.4.6 Fractures .................................................................................................................16 2.4.7 Sex-Gender Differences in Complications ............................................................18 2.4.8 Insurance / License / Employment .........................................................................19 2.5 COST ..................................................................................................................................19 2.5.1 Canada....................................................................................................................19 2.5.2 USA........................................................................................................................20 2.6 SUMMARY ........................................................................................................................20 MANAGEMENT ......................................................................................................................21 3.1 PREVENTION ....................................................................................................................21 3.1.1 Lifestyle Modification ...........................................................................................21 3.2 DIAGNOSIS .......................................................................................................................22 3.2.1 Prediabetes .............................................................................................................22 3.2.2 Diabetes..................................................................................................................23 3.3 GLYCEMIC TARGETS .....................................................................................................23 3.4 INTENSIVE VS LESS INTENSIVE GLYCEMIC CONTROL ........................................24 3.4.1 UKPDS ..................................................................................................................25 3.4.2 ADVANCE ............................................................................................................26 3.4.3 VADT ....................................................................................................................26 3.4.4 ACCORD ...............................................................................................................27 3.4.5 Meta-analysis of Intensive Glucose Control Trials ...............................................31 vi 3.4.6 Intensive Glucose Control in Acute Coronary Syndrome .....................................31