2024年10月8日 · Normal QTc values. QTc is prolonged if > 440ms in men or > 460ms in women; QTc > 500 is associated with an increased risk of torsades de pointes; QTc is abnormally short if < 350ms; A useful rule of thumb is that a normal QT is less than half the preceding RR interval

Definitions of normal QTc vary from being equal to or less than 0.40 s (≤ 400 ms), [13] 0.41 s (≤ 410 ms), [15] 0.42 s (≤ 420 ms) [14] or 0.44 s (≤ 440 ms). [16] For risk of sudden cardiac death , "borderline QTc" in males is 431–450 ms; and, in females, 451–470 ms.

2025年3月17日 · The QT interval varies depending on hear rate, it decreases at faster heart rates and it lengthens at slower rates, so to determine whether is normal or not it should undergo adequate rate correction (corrected QT or QTc). Normal QT interval: QT interval 380 ms, corrected QT interval 425 ms with HR of 75 bpm.

2023年12月23日 · What Is Normal QT QTc On ECG? The normal QTc interval is taken as 0.36-0.44s. The normal QT interval in women is slightly higher than in men. Normal QTc for males 0.36 – 0.44s. Normal QTc for females 0.36 – 0.46s. The heart rate …

2019年6月10日 · Garabelli P, Stavrakis S, Albert M, Koomson E, Parwani P, Chohan J, Smith L, Albert D, Xie R, Xie Q, Reynolds D, Po S. Comparison of QT interval readings in normal sinus rhythm between a smartphone heart monitor and a 12-lead ecg for healthy volunteers and inpatients receiving sotalol or dofetilide.

QT duration and corrected QT (QTc) duration. 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.

QT interval varies with heart rate; females have a longer QT interval than males; definitions vary in the literature but as a guide, normal QTc intervals are <450 milliseconds (ms) for men and <460 ms for women; a QTc between these values and 500 ms is considered prolonged