In general, the normal QT interval is below 400 to 440 milliseconds (ms), or 0.4 to 0.44 seconds. Women have a longer QT interval than men. Lower heart rates also result in a longer QT interval.

Normal blood-potassium levels for a woman of her age should have been about twice that. A QT interval is the time in between the start of the Q wave and the end of the T wave in a patient’s heart.

In simple terms, a QT interval measures the length of time between the start of the Q-wave and the end of the T-wave. This interval represents the time it takes for the lower chambers, or ...

Thus, the small change in the QT interval observed in normal volunteers exposed to usual ... to a potentially increased risk. Elderly women, persons with advanced heart disease, patients receiving ...

had a prolonged QT interval and 226 patients (67.5%) had a normal QT interval. Compared to those with a normal QT interval, patients with a prolonged QT interval were older (70 years on average ...

In an electrocardiogram test, this abnormality appears as a wider-than-normal QT interval, a pattern of “hills” in a map of peaks and valleys corresponding to the heart contracting and relaxing.

The QT interval is the time from the beginning of the QRS complex (ventricular depolarization) to the end of the T wave (ventricular repolarization). The normal QT interval is controversial and ...