A nurse assesses the heart after acetylcholine because the effect of acetylcholine on the heart is to:
a. decrease the refractory period.
b. increase calcium influx.
c. increase the strength of myocardial con-traction.
d. decrease the heart rate.
ANS: D
Acetylcholine causes decreased heart rate and slows conduction through the AV node; it does not decrease the refractory period nor does it increase calcium influx. It does not increase the strength of myocardial contraction.
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