A patient is brought to the emergency department by paramedics for a dysrhythmia. When the patient is placed on the cardiac monitor, the pervading rhythm is a premature ventricular contraction (PVC) every other beat
The nurse knows that a PVC is caused by what?
A) Late repolarizations of the atrium of ventricle
B) Early depolarizations of the atrium or ventricle
C) Early firing of the AV node
D) Late firing of the SA node
Ans: B
Feedback: Early depolarizations of the atrium or ventricle cause premature contractions, placing the patient at risk for dysrhythmias. Therefore options A, C, and D are incorrect.
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