QT interval Tessa Davis Cite this article as: Tessa Davis. QT interval, Don't Forget the Bubbles, 2014. Available at: https://doi.org/10.31440/DFTB.5749QT interval varies with heart rate. Bazett’s formula is used to correct the QT for HR: QTc = QT measured / (√R–R interval) Normal QTc: Infants less than 6 months is < 0.49 seconds Older than 6 months < 0.44 seconds QTc is prolonged in: Hypocalcaemia Myocarditis Long QT syndromes e.g. Romano‐Ward Head injury Drugs: see table QTc is short in: Hypercalcaemia Digitalis effect April 3, 2014
QT interval
Tessa Davis. QT interval, Don't Forget the Bubbles, 2014. Available at:
https://doi.org/10.31440/DFTB.5749
QT interval varies with heart rate.
Bazett’s formula is used to correct the QT for HR:
Normal QTc:
QTc is prolonged in:
QTc is short in: