How should the nurse calculate the heart rate from a rhythm strip?
A. Count the number of R waves in 30 large blocks and multiply by 10.
B. Count the number of small squares in a 3-second period and multiply by 0.20.
C. Count the number of large squares and multiply by 3.
D. Count the number of P waves in a 0.04 second and multiply by 5.
Answer: A
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