The QT interval is the time from the beginning of the QRS complex, representing ventricular depolarization, to the end of the T wave, resulting from ventricular repolarization. The normal QT ...

See the ECG Tutorial section on QT interval to learn how this is measured. Multiple medications, electrolyte abnormalities (hypocalcemia, hypomagnesemia and hypokalemia) and certain disease states ...

The "Texas Hold ‘Em" singer showed off her natural locks in a Cécred hair tutorial on Monday morning ... m able to focus and take [quality time] QT and spend it on me," she said before thanking ...