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

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
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: 
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

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....
View Full Document

This note was uploaded on 11/10/2011 for the course PT 101 taught by Professor Staff during the Spring '10 term at Texas State.

Ask a homework question - tutors are online