Q 1: What does QT interval represent?
Q 2: What is the normal duration of QT?
Q 3: What is QTc
Q 4: What conditions prolong QTc interval?
Q 5: What conditions shorten QTc interval?
Q 1: What does QT interval represent?
The QT interval represents the duration of activation and recovery of the ventricular muscle.
Q 2: What is the normal duration of QT?
This duration varies inversely with the heart rate
Q 3: What is QTc
Since the duration of QT varies inversely with the heart rate, the QT is not used, but rather the corrected QT is.
QTc interval
QTc = QT + 1.75 (ventricular rate - 60)
The normal QTc is approximately 0.41 seconds. It tends to be slightly longer for females and increases slightly with age.
Q 4: What conditions prolong QTc interval?
Q 5: What conditions shorten QTc interval?
May be shortened in hypocalcemia.
