The PR interval viewed on a normal electrocardiogram represents: ...

[SGallaher96]

The PR interval viewed on a normal electrocardiogram represents:
 
  a. atrial depolarization.
  b. ventricular depolarization.
  c. onset of atrial activation to onset of ven-tricular activity.
  d. electrical systole of the ventricles.

Question 2

A 13-year-old took a weight loss drug that activated the sympathetic nervous system. Which of the following assessment findings would the nurse expect?
 
  a. Decreased myocardial contraction
  b. Decreased heart rate
  c. Increased cardiac conduction
  d. Increased intranodal conduction time

[bd5255]

Answer to Question 1

ANS: C
The PR interval represents the onset of atrial activation to the onset of ventricular activity. The P wave represents atrial depolarization. The QRS complex represents ventricular depolarization. The QT interval represents electrical systole of the ventricles.

Answer to Question 2

ANS: C
Stimulation of the SA node by the sympathetic nervous system rapidly increases cardiac conduc-tion. Stimulation of the sympathetic nervous system would increase myocardial contraction and heart rate. Such simulation would not affect conduction time within the node. These are inherent rates.

[SGallaher96]

Correct answers!

[bd5255]

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