Overview :
The heart rate can be calculated from the
ECG strip since it is printed at a constant speed.
For regular rhythm, the heart rate can be
calculated by:
1) divide
the number of 0.4 second time lines (1 mm) in a P-P or R-R
interval into 1500.
2) divide
the cycle length (time between peaks of 2 successive P or R
waves) expressed in seconds into 60.
If the heart rate is irregular, measure
several R-R intervals:
1) number of 0.4 second lines over the
intervals
2) count the number of R-R intervals
3) divide #1 by #2 to get an average
interval
4) divide #3 into 1500
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