Dose-dependent relationship between SGLT2 inhibitor hold time and risk for postoperative anion gap acidosis: a single-centre retrospective analysis

Retrospective Chart Review of Euglycemic Diabetic Ketoacidosis Rates and Outcomes Postimplementation of Sodium Glucose Cotransporter 2 Inhibitor Use Stoppage 5 Days Before Open Heart Surgery

OBJECTIVES

Outcomes of stopping sodium-glucose cotransporter 2 inhibitors (SGLT2i) 5 days before open heart surgery (euglycemic diabetic ketoacidosis [eDKA] rate, mortality, infection, hospital, and cardiovascular intensive care unit [CVICU] length of stay [LOS]).

DESIGN

Retrospective study.

SETTING

Academic university hospital.

PARTICIPANTS

Adult open heart surgery patients.

EXPOSURES

Patients on SGLT2i who stopped medications 5 days before open heart surgery versus non-SGLT2i-using patients.

MEASUREMENTS AND MAIN RESULTS

We evaluated patients who were told to stop SGLT2i 5 days before receiving open heart surgery for eDKA development within 24 hours of hospital admission (12/14/2022 to 10/25/2023). Non-eDKA outcomes were compared between SGLT2i users and non-users using Wilcoxon rank sum and Chi-square testing as appropriate. Of 540 open heart surgery patients, 48 (8.9%) were prescribed SGLT2i's before surgery; of these, 0 (0%) developed eDKA within 24 hours of hospital admission. Hospital LOS was statistically longer for patients with SGLT2i use (median [interquartile range]: 4 [4-5] v 4 [3-6] days, p = 0.003; mean [standard deviation]: 4 [3] v 5 [2], p = 0.03). We found no significant difference between patients with and without SGLT2i use in CVICU LOS (median [interquartile range]: 1.67 [0.95-2.09] v 1.17 [0.96-1.88] days, p = 0.14), in-hospital mortality (2.1% [1] v 0.6% [3], p = 0.3), or sternal infections (0 [0.0%] v 2 [0.4%], p > 0.9).

CONCLUSION

Postoperative eDKA was absent in SGLT2i patients told to stop medications 5 days before open heart surgery. LOS and infection and mortality rates appeared similar between the two cohorts. Stopping SGLT2i medications 5 days before open heart surgery appears safe.

Elective peri-operative management of adults taking glucagon-like peptide-1 receptor agonists, glucose-dependent insulinotropic peptide agonists and sodium-glucose cotransporter-2 inhibitors: a multidisciplinary consensus statement: A consensus statement from the Association of Anaesthetists, Association of British Clinical Diabetologists, British Obesity and Metabolic Surgery Society, Centre for Perioperative Care, Joint British Diabetes Societies for Inpatient Care, Royal College of Anaesthetists, Society for Obesity and Bariatric Anaesthesia and UK Clinical Pharmacy Association

INTRODUCTION

Glucagon-like peptide-1 receptor agonists, dual glucose-dependent insulinotropic peptide receptor agonists and sodium-glucose cotransporter-2 inhibitors are used increasingly in patients receiving peri-operative care. These drugs may be associated with risks of peri-operative pulmonary aspiration or euglycaemic ketoacidosis. We produced a consensus statement for the peri-operative management of adults taking these drugs.

METHODS

This multidisciplinary consensus statement included surgeons, anaesthetists, physicians, pharmacists and people with lived experience relevant to these guidelines. Following the directed literature review, a three-round modified Delphi process was conducted to generate and ratify recommendations.

RESULTS

Patients taking glucagon-like peptide-1 receptor agonists and dual glucose-dependent insulinotropic peptide receptor agonists should: continue these drugs before surgery; have full risk assessment and stratification; and receive peri-operative techniques that may mitigate risk of pulmonary aspiration before, during and after sedation or general anaesthesia. Patients taking sodium-glucose cotransporter-2 inhibitors should omit them the day before and the day of a procedure. All patients should have risks and mitigation strategies discussed with a shared decision-making approach.

DISCUSSION

Until more evidence becomes available, this pragmatic, multidisciplinary consensus statement aims to support shared decision-making and improve safety for patients taking glucagon-like peptide-1 receptor agonists, dual glucose-dependent insulinotropic peptide receptor agonists and sodium-glucose cotransporter-2 inhibitors during the peri-operative period.

Preoperative SGLT2 Inhibitor Use and Postoperative Diabetic Ketoacidosis

Importance

Case reports of postoperative diabetic ketoacidosis in patients using sodium-glucose cotransporter 2 inhibitor (SGLT2i) medications underlie guidance by the US Food and Drug Administration to withhold SGLT2i medication for at least 3 days prior to surgery. Given the potential negative consequences associated with preoperative medication withholding, a large-scale evaluation of the risk of diabetic ketoacidosis in this population is needed.

Objective

To estimate the association between preoperative SGLT2i medication use and postoperative diabetic ketoacidosis in a population of patients who underwent a variety of emergency surgeries. Emergency surgery was chosen given the assumption that a patient would be unable to withhold their SGLT2i medication per the current guidance.

Design, Setting, and Participants

This retrospective cohort study was conducted among a nationwide sample of patients aged 18 years or older with type 2 diabetes who were enrolled in commercial or Medicare fee-for-service insurance plans and who underwent 1 of 13 emergency surgeries between January 1, 2016, and December 15, 2022. Emergency surgeries were defined as those occurring on the same day or the 1 to 2 days after an emergency department claim. Data were analyzed from November 2023 through December 2024.

Exposure

SGLT2i medication use.

Main Outcomes and Measures

Diabetic ketoacidosis, defined by diagnosis codes, in the 0 to 14 days after surgery.

Results

Among 34 671 patients with type 2 diabetes who underwent emergency surgery (mean [SD] age, 63.9 [14.0] years; 19 175 female [55.3%] and 15 496 male [44.7%]), the most common surgeries were laparoscopic cholecystectomy (9385 patients) and transurethral procedures (12 246 patients). There were 2607 patients (7.5%) who used SGLT2i medications and 32 064 patients (92.5%) who did not. Unadjusted incidence of diabetic ketoacidosis was 127 patients (4.9%) for those exposed to SGLT2i medications and 1115 patients (3.5%) for those unexposed. After accounting for covariates, including demographic characteristics, indicators of diabetic severity, comorbidities, and surgery type, the incidence of the outcome was 3.8% for those exposed to SGLT2i medications and 3.5% for those unexposed. The average treatment effect [ATE] was 0.2% (95% CI, -1.7% to 2.2%). Results were robust to alternate specifications (eg, intensive care unit-level care as the outcome: ATE, -1.0%; 95% CI, -2.9% to 1.1%).

Conclusions and Relevance

This study found that preoperative use of SGLT2i medications in patients undergoing emergency surgery was not associated with an increased risk for postoperative diabetic ketoacidosis compared with no use of SGLT2i medications. These findings may justify liberalizing current guidance on preoperative SGLT2i medication withholding periods.

Perioperative and periprocedural management of GLP-1 receptor-based agonists and SGLT2 inhibitors: narrative review and the STOP-GAP and STOP DKA-2 algorithms

The GLP-1 receptor-based agonists (GLP-1RAs) and SGLT2 inhibitors (SGLT2i) are major twenty first century breakthroughs in diabetes and obesity medicine but there are important safety considerations regarding the perioperative and periprocedural management of individuals who are treated with these agents. GLP-1RAs have been linked to an increased risk of retained gastric contents and pulmonary aspiration while SGLT2i can be associated with diabetic ketoacidosis. This manuscript provides a narrative review of the available evidence for perioperative and periprocedural risks in people prescribed GLP-1RAs and SGLT2i. The authors provide expert opinion-driven recommendations and algorithms on how to safely manage GLP-1RAs and SGLT2i under perioperative/periprocedural settings.

Metabolic acidosis in patients with diabetes 2 undergoing cardiac surgery: The impact of SGLT2 inhibitor use: a retrospective cohort study

BACKGROUND

Sodium-glucose cotransporter 2 inhibitors (SGLT2-i) lower blood sugar and reduce cardiovascular events and kidney failure. However, there have been increasing reports of euglycaemic diabetic ketoacidosis (eDKA) linked to SGLT2-i medicines.

OBJECTIVE

Investigating the association between SGLT2-i use and the incidence of metabolic acidosis in patients with type 2 diabetes undergoing cardiac surgery.

DESIGN

A retrospective observational cohort study comprising 121 patients, with 38 in the SGLT2-i group and 83 in the control group.

SETTING

A 2-year period at Haukeland University Hospital, a tertiary regional hospital in Western Norway.

PATIENTS

Patients with type 2 diabetes undergoing cardiac surgery.

INTERVENTIONS

Collection of clinical and laboratory data, including acid/base balance parameters, surgery details and SGLT2-i use.

MAIN OUTCOME MEASURES

Base excess and anion gap measurements as indicators of ketosis development. A subgroup analysis in patients without renal failure (glomerular filtration rate > 60 ml min -1  m -2 ) .

RESULTS

Lower base excess levels and increased anion gaps were observed in the SGLT2-i group compared with controls at various time points postoperatively, with no significant differences in serum lactate levels.Twelve hours postoperatively, 41% of SGLT2-i patients without renal failure had a base excess -3 mmol l -1 or less after correction for serum lactate (indicating ketosis) compared with only 8% in the control group ( P  < 0.001). The anion gap was elevated in the SGLT2-i group compared to the control group at 12 h postoperatively ( P  = 0.018).Multivariable regression analysis identified SGLT2-i use as an independent factor associated with a lower base excess after correction for lactate levels ( P  < 0.001). Cessation of SGLT2-i medication did not correlate with the degree of acidosis.

CONCLUSION

While taking SGLT2 inhibitors, diabetic patients undergoing heart surgery are at an increased risk of ketosis and possibly metabolic acidosis. This emphasises the importance of careful observation and effective treatment strategies within this group.

The peri-operative implications of sodium-glucose co-transporter 2 inhibitors: a narrative review

INTRODUCTION

Sodium-glucose co-transporter 2 inhibitors are a novel class of antihyperglycaemic drugs used in the management of type 2 diabetes, that improve glycaemic control, cardiovascular outcomes and promote weight loss. They are also approved for the treatment of heart failure and chronic kidney disease in patients with or without diabetes. This narrative review discusses the peri-operative effects and implications of sodium-glucose co-transporter 2 inhibitors and gives an overview of current evidence and existing peri-operative guidelines.

METHODS

We conducted a literature review to identify peer-reviewed English language articles published since 2000, with further articles identified by reviewing the references of key papers.

RESULTS

Peri-operative sodium-glucose cotransporter 2 inhibitor use carries a risk of euglycaemic ketoacidosis. Although clinically significant diabetic ketoacidosis remains a rare event, sodium-glucose co-transporter 2 inhibitors inhibitor-associated diabetic ketoacidosis has been observed across almost all surgical specialities. Ketoacidosis may present with any blood glucose level. Existing guidelines are inconsistent and may be a source of clinical confusion.

DISCUSSION

Based on the half-life of sodium-glucose cotransporter 2 inhibitors, we recommend withholding treatment for 72 h before elective surgery (5 half-lives), with additional multidisciplinary input for specific procedures with dietary alterations and in patients with poorly controlled diabetes of cardiac/renal disease. In the event of emergency surgery or any surgery within 72 h of sodium-glucose cotransporter 2 inhibitor administration, we recommend pre-, intra- and postoperative blood ketone monitoring (6 hourly for 24 h post-surgery and until full oral diet is resumed). Sodium-glucose cotransporter 2 inhibitor treatment should only be resumed after resumption of full oral diet in the absence of ketosis.

Perioperative Medication Management

Medication management in the perioperative period is a critical part of the decision-making prior to surgery. While randomized trial levels of evidence in this space are scant, retrospective data and expert consensus provide practical guidance for these decisions. Clinicians must understand risks and benefits of withholding versus continuing medications, stop medications based on pharmacokinetics and effect on primary disease and surgical risk, and resume medications after surgery in a timely manner. Knowing alternate routes of medication administration can help keep chronic disease processes stable through surgery.

Anti-Hyperglycemic Medication Management in the Perioperative Setting: A Review and Illustrative Case of an Adverse Effect of GLP-1 Receptor Agonist

A host of anti-hyperglycemic agents are currently available and widely prescribed for diabetes and weight loss management. In patients undergoing surgery, use of these agents poses a clinical challenge to surgeons, anesthesiologists, and other perioperative care providers with regard to optimal timing of discontinuation and resumption of use, as well as possible effects of these agents on physiology and risk of postoperative complications. Here, we provide a comprehensive review of anti-hyperglycemic medications' effects on physiology, risks/benefits, and best practice management in the perioperative setting. Additionally, we report an illustrative case of small bowel obstruction in a patient taking semaglutide for 6 months prior to an otherwise uncomplicated laparoscopic hysterectomy and bilateral salpingo-oophorectomy. This review is meant to serve not as a replacement of, but rather as a consolidated complement to, various society guidelines regarding perioperative anti-hyperglycemic agent management.

Risk of perioperative discontinuation of SGLT2 inhibitors

When sodium-glucose cotransporter-2 (SGLT2) inhibitors were primarily prescribed for treatment of diabetes mellitus, guidelines recommended withholding SGLT2 inhibitors before surgery to mitigate the associated risk of ketoacidosis. However, currently, SGLT2 inhibitors are an established therapy for patients with heart failure, and there is evidence that withholding SGLT2 inhibitors can worsen these patients' cardiovascular risk profile. We present an updated risk-benefit analysis of withholding SGLT2 inhibitors before surgery, focusing on patients with heart failure and addressing the risk of ketoacidosis and its treatment in these patients. Clinicians should consider perioperative continuation of SGLT2 inhibitors when prescribed for treatment of heart failure.

One size does not fit all: Perioperative management of patients with heart failure with preserved ejection fraction

Heart failure with preserved ejection fraction (HFpEF) is recognized as an important risk factor for perioperative complications. However, anesthesia management of HFpEF patients remains a considerable challenge without clear guidance. HFpEF is heterogeneous in its pathophysiological processes, diverse clinical presentations, adverse remodeling of cardiovascular and other organs, and clinical outcomes. It is difficult to manage the disease with one fixed approach because of this. This review phenotypes HFpEF patients by combining their clinical features and anesthesia care issues. Five phenotypes of HFpEF patients are identified: A, O, P, C, and Y. The clinical features, anesthesia implications, and anesthesia management for each phenotype are highlighted and discussed. Such an approach to HFpEF patients in the operating room could deliver safe, high-quality perioperative care.

Perioperative use of glucagon-like peptide-1 receptor agonists and sodium-glucose cotransporter 2 inhibitors for diabetes mellitus

Type 2 diabetes mellitus is an increasingly common long-term condition, and suboptimal perioperative glycaemic control can lead to postoperative harms. The advent of new antidiabetic drugs, in particular glucagon-like peptide-1 (GLP-1) receptor agonists and sodium-glucose cotransporter 2 (SGLT2) inhibitors, has enabled perioperative continuation of these medicines, thus avoiding the harms of variable rate i.v. insulin infusions whilst providing glycaemic control. There are differences between medicines regulatory agencies and organisations on how these classes that are most often used to treat diabetes mellitus, (but also in the case of SGLT2 inhibitors chronic kidney disease and heart failure in those without diabetes) should be managed in the perioperative period. In this commentary, we argue that GLP-1 receptor agonists should continue during the perioperative period and that SGLT2 inhibitors should only be omitted the day prior to a planned procedure . The reasons for the differing advice advocated between regulatory agencies and what anaesthetic practitioners should do in the face of continuing uncertainty are discussed.