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  • Title: In patients with type 2 diabetes the presence of Hashimoto's thyroiditis reduces the beneficial effect of dipeptidyl peptidase-4 inhibitor on plasma glucose control.
    Author: Watanabe T, Temma Y, Okada J, Yamada E, Saito T, Osaki A, Shimda Y, Matsumoto S, Horiguchi K, Ishida E, Kondo Y, Okada K, Takamizawa T, Nakajima Y, Ozawa A, Okada S, Horigome M, Yamada M.
    Journal: Endocr J; 2021 May 28; 68(5):599-603. PubMed ID: 33408313.
    Abstract:
    In this study, we compared the efficacy of a dipeptidyl peptidase-4 inhibitor (DPP4i) to improve glucose control in patients with type 2 diabetes mellitus (T2DM) with or without Hashimoto's thyroiditis (HT). First, we compared the change in glycated hemoglobin (HbA1c) between the hypothyroid condition (before levothyroxine sodium hydrate [LT4] treatment) and euthyroid condition (after LT4 treatment when patients had achieved euthyroidism for at least six months) in patients with T2DM and HT. Next, we compared the change in HbA1c levels before and six months of DPP4i treatment in patients with T2DM with and without HT. In hypothyroid condition the change in HbA1c after six months of DPP4i treatment was 0.13% ± 0.86%. The change in HbA1c levels from when patients first achieved euthyroidism to after six months in the euthyroid condition was 0.26% ± 0.90%. DPP4i efficacy in patients with T2DM and HT was reduced compared to patients with T2DM but without HT (-0.40 ± 0.90 vs. -0.99 ± 0.5, p = 0.0032). These data suggest that hypothyroidism does not impact on DPP4i efficacy. However, the effect of DPP4i in patients with T2DM and HT was reduced compared to that in T2DM patients without HT. An estimation of thyroid function before prescribing DPP4i may be useful tool for predicting the efficacy of DPP4i, allowing the ruling out complications from HT.
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