A nurse is reading a client's ECG tracing. There are nine QRS complexes in a 6-second interval. The client's heart rate is 90 beats per minute (bpm).
The heart rate is calculated by finding out the number of QRS complexes in a 6-second interval and then multiplying this number by ten.
The number obtained thereafter gives the heart rate in beats per minute (bpm). The heart rate determined by this formula is practically an estimation of the actual heart rate.
The nurse notes nine QRS complexes in a 6-second interval. Therefore, the heart rate is given by:-
9 X 10 = 90 bpm.
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