A long 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..., wider than 1/2 the R-R intervalThe distance between the top of the R waves. Figure 4.15 The Normal Q Wave and QT Interval Figure 4.15 illustrates the Q wave, QT interval and the R-R interval. A normal QT interval should be less than half the..., is a significant risk factor for developing hemodynamically unstable 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 such as ventricular tachycardiaIs a cardiac rhythm characterized by rapidly occurring wide QRS complexes with absent or infrequent P waves evident; the absence of atrial kick, the lack of filling time, and the tendency for ventricular tachycardia to change to ventricular fibrillation makes... and torsades de pointesMeans the twisting of the points, a polymorphic ventricular tachycardia characterized by periods of increasing QRS amplitude followed with a period of reduced QRS amplitude – then the pattern repeats again; often associated with effects of cardiac drugs or with.... A prolonged QT 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... is also associated with a higher incidence of sudden death.
