1. Just a few more days before I take the NCLEX. I cannot for the life of me find the formula to calculate fetal heart rate or EKG heart rate, any other formulas or references you can point me to would be very much appreciated, thank you in advance!
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Joined: Oct '07; Posts: 3

3. I'm not sure I understand the question. I don't recall anything about using a formula for determining heart rate in NS, on the NCLEX, or in practice. So I'd say don't freak out about it, but maybe someone else knows.
4. I didn't have any of those kinds of questions on my NCLEX-or in my practice questions. You calculate a heartrate on an EKG strip using calipers-or the quick way is to count the tops of the QRS by 10's. Sorry I can't be more help!
5. Quote from Jules24
count the tops of the QRS by 10's.
That was my first thought too, but I couldn't figure out if that was specific to FHR strips or neonates.

I should make the disclaimer that my NS was horrifically deficient in teaching us EKGs. We only had to learn to recognize fatal rythms.
6. If you're referring to determining the rate on a rhythm strip, you can either use the six-second method x10 that Jules suggests, or with adults and older children you can take 300 and divide it by the # of large boxes between the R waves. The 300 method does tend to get less precise for the faster rates of peds though.
7. On a fetal heart rate strip, you don't count beat-to-beat, unless they have a fetal scalp electrode (which you would count beats like a regular EKG)

You would count a fetal HR by looking at the fetal monitor HR tracing line, which "draws" a horizontal line on paper that is divided vertically with numbers like 130, 145, etc. (trend of heart rate)

All fetal monitors also have a doppler probe that lets you and the machine "hear" the heartbeat, which the machine displays as a number on the screen. You just have to make sure it's not accidentally picking up mom's heartbeat.
8. I swear I was given a study question by Kaplan that said something to the effect of "estimate fetal heart rate on this six second strip." Correct me if I am wrong but if each small square was 0.04 seconds I could count from peak to peak and divide the resultant number into 1500 to estimate the number of beats per minute?