What are the atrial and ventricular rates for lead I in the following electrocardiogram? Atrial Rate Ventricular Rate
a. 75 225 c. 300 75
b. 180 90 d. 135 45
ANS: C
The strip is 2.4 seconds long, so 60 ÷ 2.4 = 25, making 25 the multiplication factor. Because there are 3 ventricular beats, the ventricular rate is 3 times 25, or 75 beats/min. There are 12 P waves, making the atrial rate 12 times 25, or 300 beats/min.
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