If the PR interval is abnormal, the nurse would assess for conditions affecting the timing of impulse transmission from which parts of the cardiac conduction system?
1. SA node to the ventricles
2. Bundle of His to the ventricles
3. AV node to the ventricles
4. Purkinje fibers to the ventricles
1
Rationale 1: The PR interval, sometimes referred to as the PRI or PR segment, represents the time it takes for the impulse to travel from the SA node down the intra-atrial pathways to the ventricles. In other words, it represents the beginning of the atrial contraction to the beginning of the ventricular contraction. The normal PR interval is 0.12 to 0.20 seconds.
Rationale 2: The transmission of impulses from the bundle of His to the ventricles is part of the QRS complex.
Rationale 3: The transmission of impulses from the AV node to the ventricles is part of the QRS complex.
Rationale 4: The transmission of impulses from the Purkinje fibers to the ventricles is part of the QRS complex.
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