Systematic ECG Rhythm Interpretation

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Last updated 5:30 PM on 8/25/26
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5 Terms

1
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What should you evaluate first when interpreting an ECG rhythm strip?

Scan the rhythm for rate, regularity, and abnormal beats.

2
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How do you estimate HR for a regular rhythm?

300 ÷ number of large boxes between consecutive R waves.

3
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How do you estimate HR from a 6-second strip with an irregular rhythm?

Count QRS complexes × 10.

4
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What should be assessed after determining HR and rhythm regularity?

Evaluate P waves → PR interval → QRS → ST segment.

5
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What are the key normal values when analyzing a rhythm strip?

  • PR: 0.12–0.20 sec

  • QRS: approximately ≤0.10–0.12 sec

  • ST: near isoelectric baseline