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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.
Purpose:
The effect of the sodium-glucose 2 (SGLT-2) inhibitors on microvascular complications remains uncertain. We performed a systematic review to determine the efficacy of the SGLT-2 inhibitors on microvascular outcomes in patients with type 2 diabetes.
Methods:
A comprehensive search was performed using Ovid, MEDLINE, EMBASE, Web of Science, and Scopus from inception to May 2019. Randomized trials comparing SGLT-2 inhibitors with placebo or other medication for type 2 diabetes for ≥ 4 weeks were included. Diabetes-related microvascular complications such as nephropathy, retinopathy, neuropathy, and peripheral vascular disease were evaluated. A random-effect model using mean differences for continuous outcomes and risk ratio for dichotomous outcomes was used to synthesize data. PROSPERO (CRD 42017076460).
Results:
A total of 40 RCTs with overall moderate quality of evidence were included. SGLT-2 inhibitors reduced the risk of renal-replacement therapy (0.65; 95% CI 0.54-0.79), renal death (0.57; 95% CI 0.49-0.65), and progression of albuminuria (0.69; 95% CI 0.66-0.73). Conversely, they appeared ineffective in maintaining eGFR (0.33; 95% CI - 0.74 to 1.41) or reducing serum creatinine (- 0.07; 95% CI - 0.26 to 0.11), whereas urine albumin-creatinine ratio (- 23.4; 95% CI - 44.6 to - 2.2) was reduced. Risk of amputation was non-significant (1.30; 95% CI 0.93-1.83). No available data were found regarding neuropathy and retinopathy to perform a quantitative analysis.
Conclusion:
SGLT-2 inhibitors may reduce the risk of renal patient-important outcomes but fail to improve surrogate outcomes. Apparently, no increased risk of amputations was observed with these medications. No data were available regarding other microvascular complications.
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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