Electrocardiogram Components

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5 Terms

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Electrocardiogram (ECG)

A graphic recording of the electrical wave patterns from the activity of cardiac muscle

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Principle Deflections

Any major peak or trough that is above or below the baseline

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P Wave

Initial peak that represents atrial depolarization

Means that immediate atrial contraction will follow

Generated by firing of the SA Node

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QRS Complex

Trough, Peak, Trough of large wave

Represents depolarization of the ventricles, followed by ventricular contraction

Generated by firing of the AV node

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T Wave

Represents ventricular repolarization, followed by muscle relaxation

Peak after QRS complex

Muscle still peaks because it is still in a small state of contraction, cardiac muscle will never be fully relaxed