ECG

Question 1

Rate

Answer 1

The usual paper speed is 25mm/sec:

1mm (small square) = 0.04 sec

5mm (big square) = 0.2 sec

Regular rhythms:

Rate = 300 / number of large squares in between each consecutive R wave.

Very fast rhythms:

Rate = 1500 / number of small squares in between each consecutive R wave.

Slow or irregular rhythms:

Rate = number of complexes on the rhythm strip x 6 (this gives the average rate over a ten-second period).