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Hello,

1. You measure in the distance in mm from from one R wave to the next R wave.

2. Then multiply that number by 0.04 (at a normal chart speed of 25mm/sec each mm = 0.04 sec). Answer = R-R interval in seconds.

3. Divide 60 by the answer to 2. (60 seconds in a minute)

Answer = HR in bpm

Hope this helps :)

Hi,

So the above method is fine if the rate is regular (though I prefer to divide the 300 by the R-R interval), but to determine the rate in atrial fibrillation:

1. Count out 6 seconds (ie 30 big squares)

2. Count the number or QRS complexes in that period

3. Times the number of QRS complexes by 10.

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Q: How can you calculate heart rate on ecg of arterial fibrilation?
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