The distance between the top of the R waves.
Figure 4.15 illustrates the Q waveA Q wave is the first negative deflection of the QRS complex that is not preceded by a R wave. A normal Q wave is narrow and small in amplitude. Note that a wide and/or deep Q wave may signify... More, QT intervalThe QT interval represents a complete ventricular cycle of depolarization and repolarization. The QT interval is measured from the beginning of the QRS complex to the end of the T wave. A QT interval should be less than 1/2 the... More and the R-R intervalA period measured on rhythm strip paper that measures a wave and a segment; the distance measured is equal to time taken as an ECG is voltage over time; a PR interval for example is measured from the beginning of... More. A normal QT interval should be less than half the R-R interval. A prolonged QT interval is associated with increased risk of R-on-T triggered lethal dysrhythmiasUsed interchangeably with arrhythmia, refers to any abnormal rhythm – not normal sinus rhythm or sinus tachycardia. 1. Six Second ECG Guidebook (2012), T Barill, p. 196 More.
1. Six Second ECG GuidebookA Practice Guide to Basic and 12 Lead ECG Interpretation, written by Tracy Barill, 2012 Introduction The ability to correctly interpret an electrocardiogram (ECG), be it a simple six second strip or a 12 lead ECG, is a vital skill... More (2012), T Barill, p. 85