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The P wave reflects the electrical impulse of the heart emanating from the atria.

This P wave is a summation wave which is an electrical activity that comes from successive signaling from multiple points, by causing wave-like contractions. These multiple points contain pacemaker cells that generate action potentials independently of the CNS.

The P wave is the first wave found on the electrocardiogram of a healthy individual. P wave render the voltage, which specifically triggers atrial muscle cell contraction. It is accompanied by the PR interval, the QRS complex, the ST interval, and finally the T wave.

When there is a rapid or slow heartbeat then it is easy to recognize it by looking at the intervals between the T wave and the P wave.

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