A combination of the Q wave, R wave and S wave, the “QRS complex” represents ventricular depolarization. This term can be confusing, as not all ECG leads contain all three of these waves; yet a “QRS ...
This tracing shows normal sinus rhythm at a rate of 67 beats/min. The third through the seventh beats, as well as the last 2 beats, have a short PR interval and a slurred up-stroke to the QRS ...
The axis of the ECG is the major direction of the overall electrical activity of the heart. It can be normal, leftward (left axis deviation, or LAD), rightward (right axis deviation, or RAD) or ...
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