Nomenclature, categorization and usage of formulae to adjust QT interval for heart rate

Figure 1 The QTc and QTp heart rate corrections for the uncorrected QT interval measured by computerized assessment of a digitized ECG.

Figure 2 The QTc and QTp heart rate corrections for the uncorrected QT interval measured by computerized assessment of a digitized ECG.

Figure 3 The QTc and QTp heart rate corrections for the uncorrected QT interval measured by computerized assessment of a digitized ECG.

Figure 4 The corrected QT interval for the different correction formulae for a 50 years old man with a QT of 400 ms.

Figure 5 The predicted QT interval for the different correction formulae for a 50 years old man with a QT of 400 ms.

Figure 6 The relationship between QTc and heart rate for QTcBZT, QTcFRD, QTcHDG, and QTcFRM. The slope of the line and how significantly it deviates from zero is shown in the insert. The goodness of fit of the data to the linear regression (line) is shown by the standard deviation of residuals.

Figure 7 The relationship between QTc and heart rate for QTcRTHa, QTcDMT, QTcGOT, and QTcMYD. The slope of the line and how significantly it deviates from zero is shown in the insert. The goodness of fit of the data to the linear regression (line) is shown by the standard deviation of residuals.