Letter: Arrhythmias in Patients with Hyperthyroidism

Abstract

We read the article entitled "The Assessment of Ventricular Arrhythmia Indicators Based on Electrocardiography in Patients With Differentiated Thyroid Cancer Followed Up With Levothyroxine Suppression" by Hepsen et al. with interest. 1 Several studies described the relationship between hyperthyroidism and ventricular arrhythmias. [1][2][3][4] A study of patients with a mean age of 20 years showed that hyperthyroidism was associated with QTc prolongation. 5 Hyperthyroidism has also been related with QT dispersion. 6 Also, Aydin et al. showed that the Tp-e interval, as well as the Tp-e/QT and Tp-e/QTc ratios, was shortened in patients with hyperthyroidism after thyroid surgery; QT dispersion was also significantly different before and after thyroid surgery. 7 Is there any data about the QT dispersion in the Hepsen et al. study? 1 What was the success rate for all surgical procedures? Could this information affect the study results?

Response to Letter to Editor Entitled “Arrhythmias in Patients with Hyperthyroidism”

“…The other question of Yayla et al 1 was the surgical success of the patients in our study. However, our study 2 was not designed to compare presurgical and postsurgical electrocardiography.…”

“…We thank Yayla et al 1 for their interest in our paper entitled “The Assessment of Ventricular Arrhythmia Indicators Based on Electrocardiography in Patients With Differentiated Thyroid Cancer Followed Up With Levothyroxine Suppression.” 2…”

“…Response to Letter to Editor Entitled "Arrhythmias in Patients with Hyperthyroidism" Sema Hepsen, MD 1 , Hilal Erken, MD 2 , and Erman Cakal, MD 1 We thank Yayla et al 1 for their interest in our paper entitled "The Assessment of Ventricular Arrhythmia Indicators Based on Electrocardiography in Patients With Differentiated Thyroid Cancer Followed Up With Levothyroxine Suppression." 2 As we mentioned in our study, ventricular arrhythmia in patients with differentiated thyroid cancer under levothyroxine suppression treatment is not well-established as atrial arrhythmias.…”