A prolonged QT interval is a condition where the heart's electrical system takes longer than normal to recharge between beats. This can be seen on an electrocardiogram (ECG) as an extended time between the Q wave and the T wave. The QT interval represents the time it takes for the heart to depolarize and repolarizeâessentially, to prepare for the next beat. A prolonged QT interval can be an indicator of underlying heart conditions and can lead to serious complications such as arrhythmias.
