To the Editor,
Thanks for your interest. It is true that QTc interval may be altered by several factors including hemodialysis and electrolyte disturbances. In our study, all electrocardiographic (ECG) measurements were taken just before initiation of dialysis session and all of the patients were undergoing maintenance hemodialysis for at least 12 months, so they were more resistant to antiarrhythmic effects of electrolyte disturbances than new patients to hemodialysis. We did not include patients who had any arrhythmia findings before or during the study, but unfortunately we did not record electrolyte measurements during ECG examination.
Second, we evaluated QTc interval according to Bazzet’s formula, but we did not evaluate intraobserver variability and we accept that this may be a limitation to our study.