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The Relationship between Increases in Morning Spot Urinary Glucose Excretion and Decreases in HbA1C in Patients with Type 2 Diabetes After Taking an SGLT2 Inhibitor: A Retrospective, Longitudinal Study

 So Ra Kim  ;  Yong-ho Lee  ;  Eun Seok Kang  ;  Bong-Soo Cha  ;  Byung-Wan Lee 
 Diabetes Therapy, Vol.8(3) : 601-609, 2017 
Journal Title
 Diabetes Therapy 
Issue Date
SGLT2 inhibitors ; Sodium glucose co-transporter 2 inhibitors ; Type 2 diabetes mellitus ; Urinary glucose excretion ; Urinary glucose-to-creatinine ratio
INTRODUCTION: Sodium glucose co-transporter 2 (SGLT2) inhibitors increase urinary glucose excretion (UGE) by reducing the renal threshold for glucose excretion, which results in decreased serum glucose concentrations in patients with type 2 diabetes mellitus (T2D). However, no study to date has determined whether larger increases in UGE after SGLT2 inhibitor treatment correspond to larger reductions in glycated hemoglobin (HbA1C). METHODS: We enrolled participants who were newly prescribed an SGLT2 inhibitor (dapagliflozin 10 mg or ipragliflozin 50 mg, once daily) as an add-on therapy. Patients were tested for HbA1C and first morning spot urinary-creatinine and -glucose concentrations immediately prior to administration of the SGLT2 inhibitor and at a 12-week follow-up appointment. We investigated the relationship between increases in morning spot UGE and decreases in HbA1C. RESULTS: A total of 101 participants with T2D were enrolled. The median age and diabetes duration were 61.0 and 12.8 years, respectively, and the median HbA1C was 8.10%. SGLT2 inhibitors significantly lowered the HbA1C level, with a median change from baseline to week 12 of -0.60% (p < 0.001). Robust increases from baseline were seen for the morning spot urinary glucose-to-creatinine ratio (UGCR), with a median change at week 12 of 47.3 mg/mg. In the correlation analysis, the ∆HbA1C level showed a significant positive correlation with ∆morning spot UGCR (r = 0.395, p < 0.001). In other words, a greater reduction in HbA1C was correlated with a smaller increase in UGE. After adjusting for confounding variables, ∆HbA1C was significantly associated with ∆morning spot UGCR. CONCLUSIONS: Although SGLT2 inhibitor treatment leads to a reduced HbA1C level by augmenting UGE, larger increases in UGE do not correlate to larger reductions in HbA1C. This suggests that the increase in UGE might not be an indicator of the degree of reductions in blood glucose.
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1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
Yonsei Authors
강은석(Kang, Eun Seok) ORCID logo https://orcid.org/0000-0002-0364-4675
이병완(Lee, Byung Wan) ORCID logo https://orcid.org/0000-0002-9899-4992
이용호(Lee, Yong Ho) ORCID logo https://orcid.org/0000-0002-6219-4942
차봉수(Cha, Bong Soo) ORCID logo https://orcid.org/0000-0003-0542-2854
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