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A patient in labor is being monitored with a tocotransducer and an ultrasound transducer

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A patient in labor is being monitored with a tocotransducer and an ultrasound transducer. The nurse reviews the electronic fetal monitoring tracing and notes uterine contractions occurring every 3 minutes, lasting 60 seconds each, and peaking at 25 mm Hg before returning to a baseline of 10 mm Hg for 2 minutes between contractions. The patient rates her contraction pain as 8 on a scale of 0 to 10 and asks the nurse why the contractions do not appear larger on the tracing. What is the nurse's best response?

A. "The tocotransducer is an external monitor and cannot accurately measure the intensity of uterine contractions."

B. "The tocotransducer accurately monitors uterine pressure; you probably have a low tolerance for pain."

C. "The tocotransducer is an internal monitor and probably needs to be readjusted."

D. "The ultrasound transducer is an external monitor and needs to be readjusted on the abdomen."