What is the normal range of the QT interval?

The normal range of the QT interval is considered to be between 0.34 and 0.43 seconds. This interval reflects the time it takes for the heart to repolarize after each heartbeat, and it is critical for assessing the heart's electrical activity. A QT interval that falls within this range indicates a normal heart rhythm, suggesting that the heart's repolarization process is functioning properly.

If the QT interval exceeds this range, it may indicate potential issues such as a risk for arrhythmias or other cardiac conditions, which can lead to serious complications. Understanding the normal QT interval helps healthcare professionals in monitoring patients and identifying any abnormalities in heart rhythms.