QT Interval ECG Interpretation #301


The QT interval represents the time for ventricular activity including both depolarization and repolarization.

It is measured from the beginning of the QRS complex to the end of the T wave. Normally, the QT interval is 0.36 to 0.44 seconds (9-11 boxes). The QT interval will vary with patient gender, age and heart rate. Another guideline is that normal QT Intervals is less than half of the R-R Interval for heart rates below 100 bpm.

ekg QT Interval


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uStat: False | db:0 | cc: US
| cDbLookup # 0 | pu: False | pl: System.Collections.Generic.List`1[System.String]
em: | newuser: False | cc: US | showD? False





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