If there are 9 QRS complexes found in 2 vertical 3 second marks on an ECG, what would the rate equal?
A) 90
B) 60
C) 80
D) 45

Question

Quizplus · Accepted Answer

The heart rate is calculated by counting the number of QRS complexes in a specific time frame and then extrapolating to a minute. Since there are 9 QRS complexes in 6 seconds (2 vertical 3 second marks), the rate per minute is calculated as (9 QRS complexes / 6 seconds) * 60 seconds = 90 beats per minute.

If There Are 9 QRS Complexes Found in 2 Vertical