On an ECG recording, five 5-mm boxes are seen between the R waves. What is the patient's heart rate per minute?
A) 60
B) 65
C) 70
D) 80

Question

Quizplus · Accepted Answer

Five sequential large squares show the record of what occurred with the heart during a time span of 1 second (5 large squares * 0.2 second = 1 second). The ventricular contraction rate can be determined by counting the number of complete QRS complexes that occur within 6 seconds and multiplying that number by 10; this gives the number of ventricular contractions in 1 minute.

On an ECG Recording, Five 5-Mm Boxes Are Seen Between