Free CRAT ECG Interpretation Questions and Answers

Question 1

Ensuring that the electrocardiograph is properly grounded reduces the risk of:

Accepted Answer

60-cycle electrical interference

Answer

Explanation:
If the electrocardiograph is not properly grounded, it can pick up interference from the electrical system, including the 60-cycle electrical interference, which can distort the ECG signal and lead to inaccurate interpretations.

Question 2

In a normal sinus rhythm, the sinus node fires at a rate of:

Accepted Answer

61-100 per minute

Answer

Explanation:
In a normal sinus rhythm, the sinus node fires at a rate of 60 to 100 times per minute, which represents the normal range for heart rate in adults.

Question 3

Which of these is a method that can be used to calculate the ventricular rate of a cardiac rhythm when the R-R is regular?

Accepted Answer

Divide the number of large boxes between 2 R waves into 300

Answer

Explanation:
To calculate the ventricular rate when the R-R intervals are regular, divide 300 by the number of large boxes between two consecutive R waves on the ECG strip. This method provides an estimate of the heart rate in beats per minute (bpm).

Question 4

An EKG caliper measurement of peak-to-peak flutter waves reveals five small boxes. What is the atrial rate of for this rhythm?

Accepted Answer

300 BPM

Answer

Explanation:
Each small box represents 0.04 seconds, and since there are five small boxes between the flutter waves, the total time for five small boxes is 0.20 seconds. To convert this to beats per minute (BPM), you invert the time interval (1/0.20) which equals 5, then multiply by 60 to convert seconds to minutes, resulting in 300 beats per minute (BPM).

Question 5

In standard calibration ECG graph paper, a deflection of the tracing upward or downward by one large box (outlined by thick, dark lines) from the baseline represents:

Accepted Answer

0.5 millivolt

Answer

Explanation:
In standard calibration ECG graph paper, each large box represents 0.5 millivolts (mV) of electrical activity. So, a deflection of the tracing upward or downward by one large box from the baseline represents a change of 0.5 millivolts in electrical potential.

CRAT - Certified Rhythm Analysis Technician Practice Test

CRAT - Certified Rhythm Analysis Technician Practice Test

Free CRAT ECG Interpretation Questions and Answers