Glucose-lowering agents for treating pre-existing and new-onset diabetes in kidney transplant recipients

Early post-transplant hyperglycemia and post-transplant diabetes mellitus following heart transplantation

INTRODUCTION

Heart transplantation is an important treatment for end-stage heart failure. Early post-transplant hyperglycemia (EPTH) and post-transplant diabetes mellitus (PTDM) are common following heart transplantation and are associated with increased morbidity and mortality.

AREAS COVERED

This review summarizes the clinical characteristics, diagnosis, and treatment of EPTH and PTDM in cardiac transplant patients, incorporating findings from non-cardiac solid organ transplant studies where relevant due to limited heart-specific research.

EXPERT OPINION

EPTH following heart transplantation is common yet understudied and is associated with the later development of PTDM. PTDM is associated with adverse outcomes including infection, renal dysfunction, microvascular disease, and an increased risk of re-transplantation and mortality. Risk factors for EPTH include the post-operative immunosuppression regimen, recipient and donor age, body mass index, infections, and chronic inflammation. Early insulin treatment is recommended for EPTH, whereas PTDM management is varied and includes lifestyle modification, anti-glycemic agents, and insulin. Given the emerging evidence on the transplant benefits associated with effective glucose control, and the cardioprotective potential of newer anti-glycemic agents, further focus on the management of EPTH and PTDM within heart transplant recipients is imperative.

Use of Sodium-Glucose Cotransporter-2 Inhibitor for Diabetes Management in Patients Following Kidney Transplantation

Objective: To evaluate data sources pertaining to the safety and efficacy of sodium-glucose cotransporter-2 (SGLT2) inhibitor use for diabetes management in patients following kidney transplantation. Data Sources: A literature search was conducted through PubMed (1966-January 2023), EMBASE (1973-January 2023), and clinicaltrials.gov databases using the search terms kidney transplantation, diabetes mellitus, and SGLT2 inhibitor or empagliflozin, dapagliflozin, and canagliflozin. Study Selection and Data Extraction: Studies evaluating human kidney transplant recipients (KTR) receiving SGLT2 inhibitors treatment and published in the English language were included. Eight case series or retrospective analyses, 4 prospective observational studies, and 1 randomized controlled trial were identified. Data Synthesis: Available literature provides evidence that the addition of SGLT2 inhibitors may provide modest benefits on glycemic control, body weight, and serum uric acid levels in certain KTR. Various studies and case reports found that incidence of urinary tract infections was low, but still present. Overall, there are limited data on mortality and graft survival; however, one study reported a benefit of SGLT2 inhibitor use in KTR relative to these outcomes. Conclusions: The current literature evaluated demonstrates that there may be benefit to the addition of SGLT2 inhibitors for diabetes management in select KTR. However, the limited evidence within a large diverse population and extended duration of treatment makes it difficult to definitively identify the true efficacy and safety of SGLT2 inhibitor use in this population.

Recent advances in new-onset diabetes mellitus after kidney transplantation

A common challenge in managing kidney transplant recipients (KTR) is post-transplant diabetes mellitus (PTDM) or diabetes mellitus (DM) newly diagnosed after transplantation, in addition to known pre-existing DM. PTDM is an important risk factor for post-transplant cardiovascular (CV) disease, which adversely affects patient survival and quality of life. CV disease in KTR may manifest as ischemic heart disease, heart failure, and/or left ventricular hypertrophy. Available therapies for PTDM include most agents currently used to treat type 2 diabetes. More recently, the use of sodium glucose co-transporter 2 inhibitors (SGLT2i), glucagon-like peptide-1 receptor agonists (GLP-1 RA), and dipeptidyl peptidase 4 inhibitors (DPP4i) has cautiously extended to KTR with PTDM, even though KTR are typically excluded from large general population clinical trials. Initial evidence from observational studies seems to indicate that SGLT2i, GLP-1 RA, and DPP4i may be safe and effective for glycemic control in KTR, but their benefit in reducing CV events in this otherwise high-risk population remains unproven. These newer drugs must still be used with care due to the increased propensity of KTR for intravascular volume depletion and acute kidney injury due to diarrhea and their single-kidney status, pre-existing burden of peripheral vascular disease, urinary tract infections due to immunosuppression and a surgically altered urinary tract, erythrocytosis from calcineurin inhibitors, and reduced kidney function from acute or chronic rejection.