When assessing an ECG, the nurse knows that the P-R interval represents the time it takes for the:
a. Impulse to begin atrial contraction
b. Impulse to transverse the atria to the AV node
c. SA node to discharge the impulse to begin atrial depolarization
d. Impulse to travel to the ventricles
Answer: d. Impulse to travel to the ventricles
The P-R interval is measured on the ECG strip from the beginning of the P wave to the beginning of the QRS complex. It is the time it takes for the impulse to travel to the ventricle.
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