ECG

Question 1

How to calculate rate?

Answer 1

1 SMALL square (1mm) = 0.04 sec (40ms)
5 SMALL squares (5mm) = 1 LARGE square = 0.2 sec (200ms)
5 LARGE squares = 1 second

calculate bpm by dividing 300 by the number of LARGE squares between each R-R interval