- What is the cause of the U wave in an ECG tracing?
Slow repolarization of the papiliary muscles
- Name the two unipolar chest lead recordings in which there is no representation of the Q wave in a normal ECG.
V1 and V2
- What does the magnitude and direction of the electromotive force in the axis of a lead represent?
Cardiac vector
- What does the cardiac vector of an ECG denote?
The mean electrical axis of the heart
- What is the normal range of direction of the mean QRS vector (electrical axis)?
-30 to +110 degrees
- What does a right axis deviation suggest?
Right ventricular hypertrophy
What is the normal PR interval?
0.12 – 0.2 s
- What is the normal QRS duration?
0.08 – 0.10 s
- What is the normal QT interval?
0.40 – 0.43 s
- What is the normal ST interval?
0.30 – 0.34 s
(Physiology; UMS 2008)
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