QT interval


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QT in·ter·val

time from electrocardiogram Q wave to the end of the T wave corresponding to electrical systole.
Farlex Partner Medical Dictionary © Farlex 2012

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.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Neuberger, "Effect of liver transplantation on QT interval prolongation and autonomic dysfunction in end-stage liver disease," Hepatology, vol.
Electrocardiogram (ECG) (Figure 1) at admission demonstrated normal QT interval and serum potassium was 5.2 mEq/L.
QT interval was prolonged and 2:1 AVB was suspected to be the so-called functional AVB, which develops due to prominently prolonged ventricular repolarization (QT 0.498 s, QTc 0.522).
The patient, aged 80 years, with a significant medical history (schizoaffective disorder and hypertension) presented a favourable evolution under treatment with aripiprazole after an acute myocardial infarction, but with QT interval modification [7].
Patients who had MVP related with secondary causes (rheumatic heart disease, Marfan syndrome, Ehlers-Danlos syndrome, cardiomyopathy, infective endocarditis, atrial septal defect, anorexia nervosa etc.) and patients who were using drugs which prolong QT interval or antiarrhythmic drugs were not included in the study.
Recent ventricular repolarization markers in resistant hypertension: Are they different from the traditional QT interval? Am J Hypertens 2008; 21: 47-53.
Keywords: Thalassaemia major, TM, Iron overload, Cardiac iron, Ferritin, QT interval.
The QT interval was measured from the beginning of the QRS complex to the end of the T wave and corrected for heart rate using the Bazett's formula: cQT = QTV (R-R interval).
There was also decrease in PR and QT intervals. Since the heart rate is the major determinant of QT interval, the QT interval was reduced due to increased heart rate.
KEY WORDS: Long QT interval; Ventricular tachyarrhythmia; Syncope; Beta blocker.
The slow heart rate and the prolonged PR and QT intervals are consistent with hypothermia; the patient's temperature was 89[degrees] F.