Certified Rhythm Analysis Technician (CRAT) Practice Exam 2025 – All-in-One Study Guide for Exam Success!

Question: 1 / 400

The atrial rate when 22 small boxes are counted between P waves is determined to be

50

60

70

To determine the atrial rate when 22 small boxes are counted between P waves, it's essential to understand the relationship between the small boxes on an electrocardiogram (ECG) and time. Each small box represents 0.04 seconds. Therefore, 22 small boxes correspond to:

\(22 \text{ boxes} \times 0.04 \text{ seconds/box} = 0.88 \text{ seconds}\).

To find the heart rate, the formula used is:

\[

\text{Heart Rate} = \frac{60 \text{ seconds}}{\text{Duration between P waves in seconds}}.

\]

Substituting the calculated duration:

\[

\text{Heart Rate} = \frac{60 \text{ seconds}}{0.88 \text{ seconds}} \approx 68.18 \text{ beats per minute}.

\]

When rounded to the nearest whole number, this value becomes 70 beats per minute. Therefore, the atrial rate found in the question is appropriately determined to be 70. This corresponds with the correct answer, indicating a proper understanding of how to analyze the atrial rate based on the measured distance between P waves on an ECG.

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