2021年3月25日 · A high number of R‑R intervals longer than 2 seconds or their absence on 24‑hour ECG may predict mortality in patients with AF.

2024年11月12日 · The RR interval is the time elapsed between two consecutive R waves in an ECG. It's a direct measure of the ventricular rate and an inverse measure of heart rate. Takahashi et al. (1998) define prolonged RR intervals as those exceeding 2.5 seconds, highlighting the importance of understanding normal ranges.

Perhaps the most established ECG difference between men and women is that of the QT interval. A prolonged QTc interval is typically defined as >450 ms in males and >460 ms in females. In clinical practice, an ECG with QTc >480 ms in females and >470 ms in …

The electrocardiographic term ‘pause’ refers to the prolonged R-R interval that represents the interruption in ventricular depolarisation. This article presents a case of sinus node dysfunction and provides a diagnostic approach to pauses on the ECG. Keywords: ECG, sinus node dysfunction, SA exit block, sinus arrest. Introduction

2025年3月17日 · In this calculator you can determine the duration of the R-R interval in milliseconds, just enter the heart rate. If you wish, you can also perform the inverse operation, you can calculate the heart rate from the duration of the R-R interval. This formula is only valid for electrocardiograms with regular rhythm.

长RR间期出现的频数不同心电诊断的疾病分布不同（P<0.01），多重比较显示，3组间均不同，其中频数在1~12的心电诊断以心律不齐和房早未下传为主；频数在13~96的心电诊断以心律不齐和心房颤动为主；频数在97以上的心电诊断以心房颤动和窦性心动过缓为主。 房早未下传和心律不齐的比重随着长RR间期出现频数的增加逐渐降低，而心房颤动、窦性心动过缓和窦性停搏则相反。 Fisher检验显示，睡眠无关比例较大的疾病有心房颤动、心律不齐、房早未下传；其中心律不 …

2021年2月17日 · Paroxysmal atrial fibrillation and flutter are key indicators in evaluating the recovery of automaticity following overdrive suppression of the sinus node by a long R-R interval, and a long...

2025年1月18日 · Prolonged QTc duration may cause malignant arrhythmias (torsade de pointes). Shortened QTc duration (≤0.32 s) is rare, but may also cause malignant ventricular arrhythmias. The U-wave is seen occasionally, especially in well-trained individuals and during low heart rate.

2024年10月3日 · A short R-R interval indicates a faster heart rate (tachycardia), while a long R-R interval suggests a slower heart rate (bradycardia). Both conditions may require medical evaluation. This calculator provides a quick and accurate way to determine heart rate from the R-R interval, making it useful for both clinical and fitness-related applications.

RESULTS The varying length of the longest RR interval corresponded to different electrocardiogram (ECG) diagnosis (Fisher test, P<0.0001). Multiple comparison analysis showed that the ECG diagnosis between the three groups were not the same: mainly arrhythmia and nonconducted atrial premature in 1.5-2.0 s group, mainly atrial fibrillation in 2. ...