Search for: [Abstract = "BACKGROUND. Electrocardiographic dispersion reflects the heterogeneity of ventricular re\-polarization. It has been suggested that changes in QT dispersion in thyroid dysfunction can be a prognostic factor in different arrhythmias, especially ventricular arrhythmias. Calculations can be done from easily available tests such as\: TSH serum level and resting electrocardiogram. AIM. The aim of the present study was to evaluate the prognostic value of the changes in thyroid dysfunction estimates of TSH, FT3, FT4 serum level and QT parameters \(QTc, QTcd\). I was looking for the answer concerning the correlation between these hormones and QTc and QTcd and whether QT parameters will be the prognostic factor for arrhythmias. METHODS. Out of 18 573 examined cardiology patients in years 2000\-2005, a group of 516 was selected \(2.77%\) with thyroid dysfunction. The study group consists of 84 patients \(0.45%\) with isolated primary thyroid dysfunction in whom TSH, FT3, FT4 serum level was checked and resting electrocardiogram was made. There were 68 \(81.0%\) women and 16 \(19.0%\) men aged 27 to 78. The medium age was 54.7\+\-10.2 years old. The observation included patients with TSH level below 0.4 uU\/ml or above 4.0 uU\/ml in screening. It was confirmed by the FT3, FT4 serum levels. The results have been analyzed retrospectively in two groups\: first \(1\)\- with hyperthyroidism \- 46 persons\; 36 women \("]

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