The patient's ECG shows the following characteristics: PR interval .08, QRS .08, and isoelectric ST segment. The nurse realizes that these characteristics indicate which finding?
1. faster than normal conduction from the SA node to the ventricles, normal conduction through the ventricles, and normal ST segment
2. faster than normal conduction from the SA node to the ventricles, faster than normal conduction through the ventricles, and normal ST segment
3. normal conduction from the SA node to the ventricles, normal conduction through the ventricles, and normal ST segment
4. normal conduction from the SA node to the ventricles, normal conduction through the ventricles, and abnormal ST segment
Correct Answer: 1
The PR interval is normally 0.12 second (up to 0.24 second is considered normal in patients over age 65). PR intervals greater than 0.20 second indicate a delay in conduction from the SA note to the ventricles. The normal duration of a QRS complex is from 0.06 to 0.10 second. QRS complexes greater than 0.10 second indicate delays in transmitting the impulse through the ventricular conduction system. The ST segment, the period from the end of the ARS complex to the beginning of the T wave, should be isoelectric. The ST segment, the period from the end of the ARS complex to the beginning of the T wave, should be isoelectric.
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