Metformin-induced thyrotropin suppression is not associated with cardiac effects

Carlo Cappelli, Mario Rotondi, Ilenia Pirola, Barbara Agosti, Ana Maria Formenti, Pasquale De Cata, Massimo Salvetti, Luca Chiovato, Maurizio Castellano

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OBJECTIVE: Metformin treatment may induce a decrease/suppression in serum TSH levels, mimicking sub-clinical hyperthyroidism (SHT). The aim of the present study was to retrospectively evaluate changes in several electrocardiographic indices in euthyroid subjects with diabetes who, after starting metformin treatment …