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When the ventricular preexcitation wave leaves the baseline and then falls back to the baseline, it is interpreted as an isoelectric line preexcitation wave.
Ventricular preexcitation is the pre excitation of a portion of the ventricular muscle by the accessory pathway, forming a rough and dull, and fuzzy wave that can be positive, negative, or biphasic.
Ventricular preexcitation is a fusion wave formed by the accessory pathway and normal atrioventricular conduction system exciting a part of ventricle respectively.
When ventricular preexcitation components occupy different proportions of QRS waves, the measured PJ intervals are different.
The polarity of ventricular preexcitation waves can be positive, as shown in Figures A and B, or negative, as shown in Figures C and D.
On the electrocardiogram, the PJ interval is used to distinguish between ventricular heartbeats and ventricular pre excitation. The normal value of PJ interval is less than 270ms.
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