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Dapagliflozin effect on endothelial dysfunction in diabetic patients with atherosclerotic disease: a randomized
Andrei C Sposito1, Ikaro Breder2, Alexandre A S Soares2
1Aterosclerose and Vascular Biology Laboratory (Aterolab), Cardiology Division, State University of Campinas Medical School, Rua Tessalia Vieira de Camargo 126, Cidade Universitaria Zeferino Vaz, Campinas, SP, 13084-971, Brazil. sposito@unicamp.br.
Background:
The glucose-lowering independent effect of sodium glucose cotransporter-2 inhibitors (SGLT2i) on arterial wall function has not yet been clarified. This study aims to assess whether SGLT2i treatment can attenuate endothelial dysfunction related to type 2 diabetes mellitus (T2D) compared with glucose-lowering equivalent therapy.
Methods:
In a prospective, open-label, single-center, randomized clinical trial, 98 patients with T2DM and carotid intima-media thickness above the 75th percentile were randomized 1:1 to 12 weeks of therapy with dapagliflozin or glibenclamide in addition to metformin in glucose-lowering equivalent regimens. The coprimary endpoints were 1-min flow-mediated dilation (FMD) at rest and 1-min FMD after 15 min of ischemia followed by 15 min of reperfusion time (I/R).
Results:
Ninety-seven patients (61% males, 57 ± 7 years) completed the study. The median HbA1c decreased by - 0.8 (0.7)% and -0.7 (0.95)% following dapagliflozin and glibenclamide, respectively. The first coprimary endpoint, i.e., rest FMD changed by + 3.3(8.2)% and - 1.2(7.5)% for the dapagliflozin and glibenclamide arms, respectively (p = 0.0001). Differences between study arms in the second coprimary endpoint were not significant. Plasma nitrite 1 min after rest FMD was higher for dapagliflozin [308(220) nmol/L] than for glibenclamide (258[110] nmol/L; p = 0.028). The resistive indices at 1 min [0.90 (0.11) vs. 0.93 (0.07); p = 0.03] and 5 min [0.93 (0.07) vs. 0.95 (0.05); p = 0.02] were higher for the glibenclamide group than for the dapagliflozin group. Plasma biomarkers for inflammation and oxidative stress did not differ between the treatments.
Conclusions:
Dapagliflozin improved micro- and macrovascular endothelial function compared to glibenclamide, regardless of glycemic control in patients with T2DM and subclinical carotid atherosclerotic disease.
Insights
Sodium glucose cotransporter-2 inhibitors (SGLT2i) like dapagliflozin improve arterial wall function in type 2 diabetes mellitus (T2DM) patients. This vascular benefit occurs independently of glucose lowering, suggesting a direct effect on endothelial health.
Area of Science:
- Cardiovascular Medicine
- Endocrinology
- Pharmacology
Background:
- The independent effect of SGLT2 inhibitors (SGLT2i) on arterial wall function in T2DM is unclear.
- This study investigates if SGLT2i can improve endothelial dysfunction beyond glucose control.
Purpose of the Study:
- To assess the efficacy of SGLT2i (dapagliflozin) versus a glucose-lowering equivalent (glibenclamide) in improving endothelial function in T2DM patients.
- To determine if SGLT2i offers vascular benefits independent of glycemic control.
Main Methods:
- A prospective, randomized clinical trial involving 98 T2DM patients with elevated carotid intima-media thickness.
- Patients received either dapagliflozin or glibenclamide for 12 weeks, alongside metformin.
- Coprimary endpoints included resting and ischemia-reperfusion induced flow-mediated dilation (FMD).
Main Results:
- Dapagliflozin significantly improved resting FMD compared to glibenclamide (p=0.0001).
- Higher plasma nitrite levels and lower resistive indices were observed in the dapagliflozin group.
- No significant differences in inflammation or oxidative stress biomarkers were found between groups.
Conclusions:
- Dapagliflozin enhances micro- and macrovascular endothelial function in T2DM patients with subclinical atherosclerosis.
- These improvements are independent of glycemic control, highlighting a direct vascular benefit of SGLT2 inhibitors.
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