The QRS complex shows ventricular depolarization — the signal spreads through the ventricles, causing them to contract. This is the most critical part: if the QRS is wide or abnormal, the ventricles aren’t conducting electricity properly.
QRS duration is the time interval from the onset to the end of the QRS complex. A short QRS complex is desirable as it proves that the ventricles are depolarized rapidly, which in turn implies that the conduction system functions properly.
The amount of electrical energy generated is recorded as a complex of 3 waves known collectively as the QRS complex. Measuring the waves vertically shows voltage. More voltage is required to cause ventricular contraction and therefore the wave is much bigger.
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