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Electrocardiogram Lab


Electrocardiograms are used to obtain information about the function of the heart. An ECG is a recording of the electrical activity of the heart made from electrodes placed on the surface of the skin. Salt solutions are good conductors of electricity and can transfer electrical activity to the skins surface. An ECG tracing shows the sum of the electrical potentials generated by all the cells of the heart at any moment (Silverthorn, 1998). Each point reflects depolarization or repolarization of a portion of the heart. Depolarization is the signal for contraction. There are three major components of an ECG: the p waves, which corresponds to depolarization of the atria (Silverthorn, 1998). The qrs complex represents the progressive wave of ventricular depolarization (Silverthorn, 1998). And the t wave, represents the repolarization of the ventricles. When recording an ECG, one active surface electrode is the positive and the other electrode is negative while the third electrode is inactive. These electrodes are known as leads. Twelve leads are now used to record ECG: the three limb electrodes plus the nine more electrodes placed on the chest and trunk. ECG’S recorded from the different lead look different and give information about different regions of the heart (Purves, 1998). An ECG provides information on heart rate and rhythm, conduction velocity, and even the condition of the tissues within the heart. Although obtaining and ECG is simple, interpreting some of its subtleties can be quite complicated.

To understand the electrical and mechanical events accociated with an ECG tracing (DiFiori and Jarrell, 1998). To record and interpret ECG tracings under a variety of physiological situations (DiFiori and Jarrell, 1998). To determine how changes in an ECG can lead to changes in the heart rate (DiFiori and Jarrell, 1998).
1). What is the effect of the heart rate on a person who is sitting as opposed to exercising?
the heart rate is faster in a person who is exercising.
2) What is the effect of the heart rate on a person who is sitting as opposed to a person demonstrating biofeedback?
the heart rate could be the same if the individual is not totally relaxed, but if the person goes to his or her special place that’s very relaxing for them, the heart while performing biofeedback could be lower than a person sitting down.

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