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CGP EDU Academic Team
Published on: August 12, 2026
‘P’ wave of ECG occurs before the
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Atrial systole, normally occurring before ventricular systole, is indicated electrically by the P wave on the ECG. Atrial contraction represented by the P wave of the electrocardiogram is characterized by electrical depolarization of the atria. Approximately 70 percent of blood goes into the ventricle and the remaining 30 percent is squeezed out through atrial contraction ( P -wave).
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