Waveforms, Intervals, and Segments

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Last updated 6:22 PM on 7/21/26
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7 Terms

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P Wave

Represents atrial depolarization (atrial contraction)

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QRS Complex

Represents ventricular depolarization (ventricular contraction); atrial repolarization occurs during this phase but is not visible

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T Wave

Represents ventricular repolarization (ventricular relaxation)

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U Wave

Not always visible; represents repolarization of the Bundle of His and Purkinje fibers

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PR Interval

Begins at the start of the P wave and ends at the start of the Q wave; measures the time from atrial depolarization to ventricular depolarization

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QT Interval

Begins at the start of the Q wave and ends at the end of the T wave; measures the time from the start of ventricular depolarization to the end of ventricular repolarization

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ST Segment

Begins at the end of the S wave and ends at the start of the T wave; measures the time from the end of ventricular depolarization to the beginning of ventricular repolarization