NCIt definition : The time interval between the start of the Q wave and the end of the T wave in the
cardiac cycle as corrected with a non-specified correction formula.;
Alternative definition : CDISC: A QT interval that is corrected for heart rate by unspecified correction method,
or by non-standard correction methods.; ACC/AHA: The time interval between the start of the Q wave and the end of the T wave
in the cardiac cycle as corrected with a nonspecified correction formula;