QT interval


QT in·ter·val

time from electrocardiogram Q wave to the end of the T wave corresponding to electrical systole.

QT Interval

Cardiac pacing The interval between the beginning of a paced QRS complex and the peak of the subsequent T wave–evoked QT in response to metabolic needs in a normal EKG; QT shortening signals a need for an ↑ in pacing rate. See Electrocardiogram.