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Electrocardiogram

Electrocardiogram - The P wave is a small wave that...

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Electrocardiogram Electrical currents generated by the heart during the cardiac cycle can be detected on the surface of  the body by the electrodes of an electrocardiograph. A recording of these currents, called an  electrocardiogram (ECG or EKG), represents a sum of all the concurrent action potentials produced  by the heart as detected by the 12 electrodes of the electrocardiograph. A single cardiac cycle  produces a distinctive wave pattern, where peaks and valleys are indicated by the letters P, Q, R, S,  and T (see Figure 1). An interpretation of the major characteristics of the ECG follows: 
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Unformatted text preview: The P wave is a small wave that represents the depolarization of the atria. During this wave, the muscles of the atria are contracting. • The QRS complex is a rapid down-up-down movement. The upward movement produces a tall peak, indicated by R. The QRS complex represents the depolarization of the ventricles. • The T wave represents the repolarization of the ventricles. Electrical activity generated by the repolarization of the atria is concealed by the QRS complex....
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