Search for: [Abstract = "78.0%\), 10 men \(22%\)\; second \(2\)\-with hypothyroidism \- 38 persons\; 32 women \(84%\), 6 men \(16%\). Both groups were divided into two subgroups\: A and B with low and high hyperthyroidism and hypothyroidism. RESULTS. In primary hyperthyroidic group \(1A\+1B\) with TSH serum level below 0.4 uU\/ml QT parameters increased. The relation seems to be inversely proportional. The lower ratio of TSH serum level, the higher the percentage of increasing distance between QTcd and QTc, especially in high level primary hyperthyroidic subgroup \(1A\) with TSH serum level below 0.1uU\/ml. QTcd interval dispersion turned out to be a more sensitive parameter than the QT corrected interval. For QTcd>65 ms the sensitivity is 88.0%\; the specificity is 42.9%. For QTc>448 ms the sensitivity is 60.0%\; specificity is 71.4%. We also observed the proportional relation between free thyroid hormones \(T3 , T4 \) and QT parameters \( QTcd , QTc\). In primary hypothyroidic group \(2A\+2B\) with TSH serum level above 4.0 uU\/ml, we noticed that the QTcd parameter increased. For QTcd>65 ms the sensitivity is 66.7%\; specificity is 20.0%. We did not observe any influence of high TSH serum level on extension of QTc parameter. For QTc>448 ms sensitivity is 44.0%\; specificity is 40.0%. What is more, we did not observe statistical influence of lower ratio of FT3, FT4 on QTc in this group either. There was also no perceptible differenc"]

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