During an analysis of an ECG strip, the critical care nurse assesses heart rate. If the rhythm is irregular, which is the best way to calculate heart rate per minute from a rhythm strip? 1. Count the...

During an analysis of an ECG strip, the critical care nurse assesses heart rate. If the rhythm is irregular, which is the best way to calculate heart rate per minute from a rhythm strip?

1. Count the number of tiny boxes between two

R waves and divide by 1500

2. Count the number of QRS complexes in a threesecond strip and multiply by 25

3. Count the number of QRS complexes in a sixsecond strip and multiply by 10

4. Count the number of large boxes between two

R waves and divide by 300