The QRS of an ECG falls on a dark vertical line of the ECG paper. Subsequent QRS complexes fall on every other dark line (10 mm apart). What is the ventricular rate?

a. 300/min
b. 200/min
c. 150/min
d. 100/min

ANS: C
You can count the number of large boxes between two successive complexes and divide this number by 300 to obtain the heart rate.

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