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Serum magnesium levels in TdP patients taking or not taking PPIs. Patients taking PPIs (PPI+), n = 14; patients not taking PPIs (PPI−), n = 13. Two-tail Student's unpaired t-test, *p < 0.05. Horizontal dotted line indicates the lower limit of reference values for serum magnesium levels, i.e., 1.5 mg/dl.
