This change produces a decrease in the length of the QTc interval. There is a lack of correlation QTc and serum calcium. The interval from the qt to the apex of the T wave can be measured most precisely and shows the best correlation with the Ca level (Fig. 94-29c). First degree ...
The Hodges formula correlated best with the RR interval. CONCLUSIONS: These formulae are strongly dependent on heart rate. In the setting of a borderline QTc Bazett prolongation, Hodges formula may be a useful adjunct. Normal infants may have a slightly longer QTc Bazett during sleep. 展开 ...
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normal QT interval Calculate the corrected QT interval (QTc) by dividing the QT interval by the square root of the preceeding R - R interval. Normal = 0.42 s. Causes oflong QT interval myocardial infarction, myocarditis, diffuse myocardial disease ...
A resting standard supine 12-lead EKG was recorded. QTc interval was calculated using Bazett's formula (QTc = QT interval/square root R-R interval). Student t-test and Pearson's correlation coefficient were used for statistical analysis. Results: There was no significant difference between ...