2024年10月8日 · The corrected QT interval (QTc) estimates the QT interval at a standard heart rate of 60 bpm; This allows comparison of QT values over time at different heart rates and improves detection of patients at increased risk of arrhythmias; There are multiple formulas used to estimate QTc. It is not clear which formula is the most useful:

The QT interval is a measurement made on an electrocardiogram used to assess some of the electrical properties of the heart. It is calculated as the time from the start of the Q wave to the end of the T wave, and approximates to the time taken from when the cardiac ventricles start to contract to when they finish relaxing.

The Corrected QT Interval (QTc) adjusts the QT interval correctly for heart rate extremes.

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.

QTc间期是按心率校正的QT间期，是反映心脏去极化和复极作用的指标。QTc间期延长表示心脏复极延迟，反映了心电异常，通常与心律失常敏感性增高密切相关。

Learn about the QT interval and action potential, corrected QT (QTc) calculations, and formulas. Understand normal, prolonged (>440ms), and short QTc (<350ms) intervals.

Corrected QT intervals (QTc) can be calculated below. Short QT syndrome (QTc <0,390 seconds) is uncommon and can be seen in hypocalcemia and during digoxin treatment. It is very rare but may cause malignant arrhythmias. The QT interval varies somewhat in the different leads.

QT interval defines the time from the onset of the QRS complex to the end of the T-wave and expresses the duration of depolarization and repolarization of the ventricular myocardium. It varies according to age, sex, and heart rate.

The QT interval is the duration of time from the beginning of the QRS complex to the end of the T wave. This correlates to the summated action potential duration of all ventricular cardiomyocytes.

2020年10月10日 · QT interval in excess of 0.44 sec is a marker of myocardial electrical instability - prolongation of QT interval is associated with possible development of ventricular arrhythmia, syncope and sudden death