Segment

A line between waves. Segments measure time between waves (waves are not included in a segment).

While waves are fairly self-explanatory, intervals measure time from the start of one wave to the start of another wave (an interval includes at least one wave) and segments measure time between waves (waves are not included in a segment).

The PR segment is the line between the end of the P wave and the beginning of the QRS complex. The PR segment signifies the time taken to conduct through the slow AV junction. This delay allows for atrial kick. The PR segment also serves as a benchmark for the isoelectric line.

Figure 4.12 The P Wave, PR Segment and PR Interval

In Figure 4.12, several ECG components are labelled. Note that a waveform is produced when the electrical potential of cardiac cell membranes change. During atrial depolarization, the atrial cell membranes quickly become more positive producing a P wave. The baseline or isoelectric line represents nothing more than an absence of voltage change to the cardiac cells.

1. Six Second ECG Guidebook (2012), T Barill, p. 81, 205

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Completion Card
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Reference materials included
Dynamic ECG rhythm interpretation
Static ECG rhythm interpretation
Clinical Impact Mapping
Acute Coronary Syndromes Overview
Acute Coronary Syndromes In-Depth
ST Segment & T Wave Differential
Identify Bundle Branch Blocks
15 | 18 Lead View Mapping
Electrical Axis
R Wave Progression
Left Bundle Branch Blocks with ACS
Atypical Findings
Acute Non-Ischemic Disease Conditions
Special Cases

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