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www.ACLScertification.com ECG Elements: The Breakdown: ✔ P wave = Atrial Depolarization ✔ PR interval = Beginning of Atrial Depolarization to the beginning of Ventricular Depolarization; Duration: 0.12-0.20 sec. ✔ QRS complex = Ventricular Depolarization; Duration = 0.08-0.12 sec. ✔ ST segment = End of Ventricular Depolarization and beginning beginning of Ventricular Repolarization ✔ T wave = Relative refractory period of Ventricular Repolarization ✔ QT interval = Ventricular Depolarization and Repolarization; Duration = 0.36-0.44 sec.
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