retrograde P wave

ret·ro·grade P wave

the P wave pattern in the electrocardiogram representing retrograde depolarization of the atria, the impulse spreading from the AV junction or the lower atrium upward.
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In 66% of AVNRTs, the P wave is hidden within the QRS complex; (29) in 30%, a retrograde P wave closely follows the QRS complex, creating a "pseudo-S" wave; and 4% of the time, the P wave precedes the QRS complex.
In AVRT, a retrograde P wave follows the QRS complex.
5) Second, the very short interval from the beginning of each QRS to the beginning of the retrograde P wave (0.
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