Frontal QRS-T angle was defined as the absolute value of the difference between the frontal QRS axis and T-wave axis. Change in frontal QRS-T angle was calculated using (QRS-T angle in deep inspirationQRS-T angle in resting state). In resting state, QRS axis and...
1)QRS axisQRS电轴 1.Age trend of the frontal QRS axis in a normal population and its effect on QRS-wave amplitude in the limb leads;正常人额面QRS电轴的年龄趋势以及对肢体导联QRS波振幅的影响 2.Relationship between QRS axis and successful ablation in patients with idiopathic ventricular arrhythmi...
The P-wave ECG interpretation usually starts with an assessment of the P-wave. The P-wave is a small, positive and smooth wave. It is small because the atria make a relatively small muscle mass. If the rhythm is sinus rhythm (i.e. under normal circumstances) the P-wave vector is dire...
1. Age trend of the frontal QRS axis in a normal population and its effect on QRS-wave amplitude in the limb leads; 正常人额面QRS电轴的年龄趋势以及对肢体导联QRS波振幅的影响2. Relationship between QRS axis and successful ablation in patients with idiopathic ventricular arrhythmias; 体表QRS...
robust median was calculated for each time point (sample) in the time series. The QRS‐T angle was subsequently calculated as the absolute difference between the QRS and T‐wave axis. If the difference exceeded 180°, ...
(range, 108 to 180 milliseconds), whereas for right coronary cusp pace maps, it was 164 milliseconds (range, 141 to 241 milliseconds).41Because the left coronary cusp lies on the same cranial plane as the right coronary cusp, the inferior lead morphology (inferior axis) does not differ ...
positive deflection after an S (or s) wave. The duration of theQRS complexreflects the time required forventricular depolarization. Ventricular activation usually requires at least 0.075 second (75 msec, nearly two small boxes). There is some debate regarding theupper limitof the normal range ...
Explain the following waves and intervals: P-wave, P-R interval, QRS wave, S-T segment, QT interval and T wave. Heart: The heart has the right as well as left chambers that are detached by a wall. It is a kind of muscular org...
subjects over the age of 60 years, and no age differences in the healthy normal range of the QRS-T angle were noted. However, the QRS-T angle could potentially increase with other characteristics that were not evaluated in the current study, and this is a limitation. Furthermore, the 95%...
myocardial volume alone. In proportional terms, adult heart sizes are less variable compared to the QRS duration11and while heart size reasonably correlates with body size12, the QRS duration does not9. This all potentially makes the broad range of the normal QRS complex durations somewhat ...