What term defines the ECG pattern between two waves?

• A. QT Interval
• B. Segment
• C. Rhythm Strip
• D. QRS Complex

Answer: (B)

In ECG terminology, the spaces on the tracing that lie between two successive waves are called segments. These segments are the baseline portions where no waves are occurring, showing the heart’s electrical activity between events. For example, the stretch between the P wave and the QRS complex is the PR segment, and the stretch between the end of the QRS and the start of the T wave is the ST segment. The term describes the pattern specifically between waves, not the waves themselves or a time interval that includes waves. A QRS complex is a single wave representing ventricular depolarization, the QT interval spans from the start of a Q wave to the end of the T wave and includes multiple waves, and a rhythm strip is the overall recording view, not the definition of the segment between waves.