QT dispersion in hypothyroidism

We studied ten women (age: 40±12 years) with primary hypothyroidism. Baseline and after T4 treatment (euthyroid stage), all patients’ resting ECGs were recorded. After T4 treatment, QTd (P=0.036), QTad (P=0.016), JTd (P=0.0001), JTad (P=0.005), Ted (P=0.036), QRS (P=0.046), QTcd (P=0.036), QTacd (P=0.028), JTcd (P=0.006), JTacd (P=0.016), Tecd (P=0.036) values shortened in patients with hypothyroidism. We found that regional inhomogeneity of ventricular repolarization in patients with hypothyroidism improves after T4 treatment.