The nurse is told in report that a patient's PR interval is within normal limits. What would the nurse anticipate as a result?
1. The PR interval will be between 0.06 and 0.12 second.
2. The PR interval will extend 8.5 to 11 small boxes on the ECG paper.
3. The PR interval will be between 0.34 and 0.43 second.
4. The PR interval will be between 0.12 and 0.20 second.
4
Rationale 1: This PR interval is shorter (faster) than normal.
Rationale 2: An interval equal to 8.5 to 11 small boxes lasts between 0.34 and 0.43 second, which is longer than the normal PR interval.
Rationale 3: The normal QT interval, not PR interval, is between 0.34 and 0.43 second.
Rationale 4: If a PR interval is within normal limits, it will be between 0.12 and 0.20 second, which is equal to 3 to 5 small boxes.
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