IV8 - IV. Heart Physiology Electrocardiography: Electrical...

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Heart Physiology IV. Electrocardiography: Electrical Activity of the Heart A. Deflection Waves of ECG 1. P wave - initial wave, demonstrates the depolarization from SA Node through both ATRIA; the ATRIA contract about 0.1 s after start of P Wave 2. QRS complex - next series of deflections, demonstrates the depolarization of AV node through both ventricles; the ventricles contract throughout the period of the QRS complex, with a short delay after the end of atrial contraction; repolarization of atria also obscured 3. T Wave - repolarization of the ventricles (0.16 s) 4. PR (PQ) Interval - time period from beginning of atrial contraction to beginning of ventricular contraction (0.16 s) 5. QT Interval the time of ventricular contraction (about 0.36 s); from beginning of ventricular depolarization to end of repolarization V. The Normal Cardiac Cycle A. General Concepts 1. systole - period of chamber contraction 2. diastole - period of chamber relaxation 3. cardiac cycle - all events of systole and diastole during one heart flow
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IV8 - IV. Heart Physiology Electrocardiography: Electrical...

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