2024年10月8日 · The QT interval is inversely proportional to heart rate: The QT interval shortens at faster heart rates; The QT interval lengthens at slower heart rates; An abnormally prolonged QT is associated with an increased risk of ventricular arrhythmias, especially Torsades de Pointes

where QTc B is the QT interval corrected for heart rate, and RR is the interval from the onset of one QRS complex to the onset of the next QRS complex. This dimensionally correct formula returns the QTc in the same units as QT, generally milliseconds.

2025年2月2日 · The QT interval is measured from the beginning of the QRS complex to the end of the T wave. It represents the duration of ventricular electrical systole (ventricular depolarisation and repolarisation). The QT interval includes the QRS interval, the ST-segment and the T wave. The U wave must be excluded

2023年12月23日 · The QT interval seen in the ECG is measured from the beginning of the QRS complex (starting point of the Q wave) to the end of the T wave as it returns to the baseline and usually measured using either lead II or lead V5 of the 12-lead ECG.

Corrects the QT interval for heart rate extremes (choose from Bazett, Fridericia, Framingham, Hodges, or Rautaharju formulas).

Worried about QT interval prolongation? This online evidence based resource will help guide you how to measure the QT interval and calculate the QTc value with an easy to use calculator which takes into account the patients underlying rhythm, gender and age.

ECG interpretation always includes an assessment of the QT interval (QT duration). The QT duration represents the total time for depolarization and repolarization. It is measured from the beginning of the QRS complex to the end of the T-wave.

2019年6月10日 · Until recently, the heart rate–corrected QT interval (QTc), which represents a dynamic measurement of the time required to reset the heart’s electric system, fell squarely into this latter category.

The QT interval is a measurement that represents the total time from ventricular depolarization to complete repolarization. This process begins at the start of the q wave and extends to the end of the T wave.

2021年2月15日 · The QT interval indicates of the time from ventricular depolarisation (phase 0) to ventricular repolarisation (phases 1-3). It is the duration of activation and recovery of the ventricular myocardium.