Which term refers to the ECG feature between two waves?

• A. Rhythm Strip
• B. QT Interval
• C. Segment
• D. Purkinje Fibers

Answer: (C)

Think of the ECG tracing as waves and the flat parts between them. The flat portion between two waves is called a segment. Examples include the PR segment, which lies between the P wave and the QRS complex, and the ST segment, which sits between the end of the QRS complex and the start of the T wave. The QT interval, by contrast, measures a span from the start of the Q wave to the end of the T wave and includes the waves themselves, so it isn’t just the feature between two waves. Rhythm strip refers to the long recording of the rhythm, and Purkinje fibers are part of the heart’s conduction system, not a tracing feature. So the term for the feature between two waves is segment.