Sodium-glucose cotransporter 2 (SGLT-2) inhibitors and microvascular outcomes in patients with type 2 diabetes:

E G Dorsey-Treviño1,2, J G González-González1,2,3, N Alvarez-Villalobos2,3,4

  • 1Endocrinology Division, Department of Internal Medicine, University Hospital "Dr. José E. González", Universidad Autonoma de Nuevo Leon, 64460, Monterrey, Mexico.

Abstract

Insights

Sodium-glucose 2 (SGLT-2) inhibitors show promise in reducing serious kidney outcomes for type 2 diabetes patients. However, they do not improve surrogate markers and data on other microvascular issues like neuropathy and retinopathy are lacking.

Area of Science:

  • Nephrology
  • Endocrinology
  • Pharmacology

Background:

  • Microvascular complications represent a significant burden in type 2 diabetes.
  • The precise impact of sodium-glucose 2 (SGLT-2) inhibitors on these complications requires further elucidation.

Purpose of the Study:

  • To systematically review the efficacy of SGLT-2 inhibitors in improving microvascular outcomes for patients with type 2 diabetes.
  • To evaluate the effect of SGLT-2 inhibitors on renal outcomes, including nephropathy, retinopathy, neuropathy, and peripheral vascular disease.

Main Methods:

  • A comprehensive systematic search of randomized controlled trials (RCTs) was conducted across multiple databases (Ovid, MEDLINE, EMBASE, Web of Science, Scopus) up to May 2019.
  • RCTs comparing SGLT-2 inhibitors with placebo or other antidiabetic medications for at least 4 weeks were included.
  • Data synthesis employed random-effect models, calculating mean differences for continuous outcomes and risk ratios for dichotomous outcomes.

Main Results:

  • Forty RCTs of moderate evidence quality were analyzed. SGLT-2 inhibitors significantly reduced the risk of renal-replacement therapy (RR 0.65; 95% CI 0.54-0.79) and renal death (RR 0.57; 95% CI 0.49-0.65).
  • A reduction in the progression of albuminuria (RR 0.69; 95% CI 0.66-0.73) and urine albumin-creatinine ratio was observed. However, no significant improvements were noted in maintaining estimated glomerular filtration rate (eGFR) or reducing serum creatinine.
  • The risk of amputation did not significantly increase (RR 1.30; 95% CI 0.93-1.83). Insufficient data precluded quantitative analysis for neuropathy and retinopathy.

Conclusions:

  • SGLT-2 inhibitors appear to decrease patient-important renal outcomes in type 2 diabetes.
  • These agents did not demonstrate improvement in surrogate renal outcomes and showed no increased risk of amputation.
  • Further research is needed to assess the impact of SGLT-2 inhibitors on other microvascular complications such as neuropathy and retinopathy.

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