Question

When calculating HR on a 6 sec strip and counting 30 boxes you would multiply by what?

Answer 1

To calculate HR on a 6 second ECG strip with 30 boxes counted, you multiply by 10 to get the estimated heart rate in beats per minute.

Step-by-step explanation:

When calculating heart rate (HR) on a 6 second ECG strip, and you count 30 boxes (or QRS complexes for heartbeats), you would multiply by 10 to estimate the number of beats per minute. Each small box on the ECG represents 0.04 seconds, and there are 5 small boxes in a large box, equating to 0.2 seconds per large box. Since there are 30 large boxes in a 6 second strip, this method gives you the number of beats in those 6 seconds. Multiplying that number by 10 converts it to a rate per minute since there are 10 sets of 6 seconds in a minute. For example, if you count 10 QRS complexes in a 6 second strip, the estimated HR would be 10 beats x 10, which is 100 beats per minute.