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| PAC (premature atrial complexes) |
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| PVC (premature ventricular contraction) |
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| electrical impluse starting in the sinus node and spreading through the atria |
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| ventricular depolarization |
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| ventricular repolarization (regaining negative charge; also called the resting state) |
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| represents repolarization of purkinje fibers |
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| measured from the beginning of the wave to the beginning of the QRS complex; normally 0.12-0.20 seconds |
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| represents early ventricular repolarization; lasts from end of QRS complex to beginning of the T wave |
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| total time for ventricular depolarization and repolarization; measured from beginning of QRS complex to end of T wave |
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| measured form end of T wave to beginning of the next P wave |
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| measured from beginning of one P wave to the beginning of the next; used to determine atrial rate and rhythm |
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| measured from beginning of QRS complex to beginning of next QRS complex; used to determine ventricular rate and rhythm |
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