On an ECG when the ventricular heart rate is regular, the rate can be determined by counting the number of large squares between two consecutive QRS complexes then
A) dividing 400 by that number of large squares
B) dividing 600 by that number of large squares
C) dividing 200 by that number of large squares
D) dividing 300 by that number of large squares

Question

Quizplus · Accepted Answer

The correct method to determine the heart rate on an ECG when the ventricular rate is regular is by dividing 300 by the number of large squares between two consecutive QRS complexes. This is based on the standard ECG paper speed of 25 mm/s, with each large square representing 0.2 seconds.

On an ECG When the Ventricular Heart Rate Is Regular