The nurse assesses the patient's rhythm strip and notes several premature ventricular contractions, which the nurse recognizes is caused by what?
A) Stimulation of the ventricles from an ectopic focus in the ventricles
B) Stimulation of the ventricles from the atrioventricular node
C) Stimulation of the ventricles from the Purkinje fibers
D) Stimulation of the ventricles from the bundle of His
A
Feedback:
Premature ventricular contractions are stimulations of the cells caused by an ectopic focus in the ventricles causing an early contraction. The source of these ectopic foci could be anywhere within the ventricles, but the end result is reduced cardiac output due to reduced force of contraction.
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