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The Basics
The
QT interval
includes the QRS complex, the ST segment, and
the T wave. It therefore measures the time from the beginning of
ventricular depolarization to the end of ventricular repolarization.
And, yes, the term QT interval is used even if a particular QRS
complex does not have a Q wave.
The term
QRS interval
is used to describe the duration of the
QRS complex alone without any connecting segments. Obviously, it
measures the duration of ventricular depolarization.
QT interval
ST
segment
QRS
interval