Determining the regularity of a rhythm allows use of the most accurate method of calculating which of these cardiac cycle measurements?
a. P-R interval
b. QRS interval
c. Heart rate
d. ST segment
ANS: C
After the rhythm regularity is determined, the heart rate is counted. For regular rhythms, use the method that is very accurate by counting the number of small boxes between two R waves and divide that number into 1,500. This gives the bpm, because 1,500 small boxes equal 1 minute.
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