Chapter 5 Rhythm Strip Interpretation and Sinus
Rhythms Questions And Correct Answers With 100%
Complete Solutions
1) What is evaluated and classified when determining dysrhythmias?
A) Rate, artifact, and complexes on the ECG tracing
B) Artifact, complexes, and patient symptoms
C) Waves, segments, and intervals on the ECG tracing
D) Patient condition and symptoms - CORRECT ANSWER- Answer: C
Explanation: The ECG waveform has various components, such as waves, segments, and intervals, that
are evaluated and classified based on their size, length of time, and location on the tracing. All of these
components help determine the type of cardiac rhythm.
2) QRS duration measurement is essential to determine the time it takes for:
A) atrial depolarization.
B) ventricular depolarization.
C) ventricular relaxation.
D) atrial relaxation. - CORRECT ANSWER- Answer: B
Explanation: Measuring the QRS complex is essential in determining the duration of time it takes for the
ventricles to depolarize.
3) The shape of the P wave is analyzed to determine whether:
A) the atrial impulses caused the ventricular contraction.
B) atrial depolarization occurred.
C) all of the atrial current is moving in the same pathway.
D) the atria and ventricles are contracting together. - CORRECT ANSWER- Answer: C
Explanation: If the shapes of the P waves appear different, the current is moving through the atria along
more than one pathway.
,4) Which of the following questions is necessary to analyze a P wave on an ECG tracing?
A) Does each P wave have a QRS complex following it?
B) Is the interval between the P wave and the QRS complex constant?
C) Are the atrial and ventricular rates the same?
D) Is the ST segment at the isoelectric line? - CORRECT ANSWER- Answer: A
Explanation: In normal conduction pathways, a QRS complex always follows the P wave.
5) The normal PR interval measurement is:
A) 0.06 to 0.12 second.
B) 0.20 to 0.24 second.
C) 0.12 to 0.20 second.
D) 0.10 to 0.16 second. - CORRECT ANSWER- Answer: C
Explanation: The normal range of the PR interval is 0.12 to 0.20 second.
6) The normal range for the QRS complex duration is:
A) 0.12 to 0.20 second.
B) greater than 0.12 second.
C) 0.06 to 0.10 second.
D) less than 0.06 second. - CORRECT ANSWER- Answer: C
Explanation: Normal QRS duration is 0.06 to 0.10 second.
7) The QRS complex represents the time it takes for:
A) the ventricles to depolarize or contract.
B) repolarization to take place.
C) the electrical current to be initiated at the SA node.
D) the current to move through the atria. - CORRECT ANSWER- Answer: A
Explanation: Measuring the QRS complex is essential in determining the time it takes for the ventricles
to depolarize or contract.
, 8) Measuring the PR interval requires the ECG technician to measure from the:
A) beginning of the Q wave to the J point.
B) beginning of the Q wave to the beginning to the T wave.
C) beginning of the P wave to the end of the R wave.
D) beginning of the P wave to the beginning of the QRS complex. - CORRECT ANSWER- Answer: D
Explanation: The PR interval is determined by measuring from the beginning of the P wave to the
beginning of the QRS complex.
9) If you can't identify an R wave on the ECG tracing, which of the following wave(s) can you use to
determine the regularity of the ventricles?
A) Q and S wave junction
B) P and R wave junction
C) T wave
D) P wave - CORRECT ANSWER- Answer: A
Explanation: Occasionally, the QRS complex does not exhibit an R wave, in which case you can use the
point of the Q and S wave junction as an easy point of evaluation.
10) What is the rate of a normal sinus rhythm?
A) 60 to 100 bpm
B) 40 to 60 bpm
C) 100 to 150 bpm
D) Greater than 150 bpm - CORRECT ANSWER- Answer: A
Explanation: Both the atrial and ventricular rates are between 60 and 100 bpm in normal sinus rhythm.
11) Identify a rhythm using these criteria: regular rhythm, ventricular and atrial rates are 74
beats/minute, P wave precedes each QRS, PR interval and QRS duration within normal limits.
A) Sinus bradycardia
B) Sinus tachycardia
C) Normal sinus rhythm
Rhythms Questions And Correct Answers With 100%
Complete Solutions
1) What is evaluated and classified when determining dysrhythmias?
A) Rate, artifact, and complexes on the ECG tracing
B) Artifact, complexes, and patient symptoms
C) Waves, segments, and intervals on the ECG tracing
D) Patient condition and symptoms - CORRECT ANSWER- Answer: C
Explanation: The ECG waveform has various components, such as waves, segments, and intervals, that
are evaluated and classified based on their size, length of time, and location on the tracing. All of these
components help determine the type of cardiac rhythm.
2) QRS duration measurement is essential to determine the time it takes for:
A) atrial depolarization.
B) ventricular depolarization.
C) ventricular relaxation.
D) atrial relaxation. - CORRECT ANSWER- Answer: B
Explanation: Measuring the QRS complex is essential in determining the duration of time it takes for the
ventricles to depolarize.
3) The shape of the P wave is analyzed to determine whether:
A) the atrial impulses caused the ventricular contraction.
B) atrial depolarization occurred.
C) all of the atrial current is moving in the same pathway.
D) the atria and ventricles are contracting together. - CORRECT ANSWER- Answer: C
Explanation: If the shapes of the P waves appear different, the current is moving through the atria along
more than one pathway.
,4) Which of the following questions is necessary to analyze a P wave on an ECG tracing?
A) Does each P wave have a QRS complex following it?
B) Is the interval between the P wave and the QRS complex constant?
C) Are the atrial and ventricular rates the same?
D) Is the ST segment at the isoelectric line? - CORRECT ANSWER- Answer: A
Explanation: In normal conduction pathways, a QRS complex always follows the P wave.
5) The normal PR interval measurement is:
A) 0.06 to 0.12 second.
B) 0.20 to 0.24 second.
C) 0.12 to 0.20 second.
D) 0.10 to 0.16 second. - CORRECT ANSWER- Answer: C
Explanation: The normal range of the PR interval is 0.12 to 0.20 second.
6) The normal range for the QRS complex duration is:
A) 0.12 to 0.20 second.
B) greater than 0.12 second.
C) 0.06 to 0.10 second.
D) less than 0.06 second. - CORRECT ANSWER- Answer: C
Explanation: Normal QRS duration is 0.06 to 0.10 second.
7) The QRS complex represents the time it takes for:
A) the ventricles to depolarize or contract.
B) repolarization to take place.
C) the electrical current to be initiated at the SA node.
D) the current to move through the atria. - CORRECT ANSWER- Answer: A
Explanation: Measuring the QRS complex is essential in determining the time it takes for the ventricles
to depolarize or contract.
, 8) Measuring the PR interval requires the ECG technician to measure from the:
A) beginning of the Q wave to the J point.
B) beginning of the Q wave to the beginning to the T wave.
C) beginning of the P wave to the end of the R wave.
D) beginning of the P wave to the beginning of the QRS complex. - CORRECT ANSWER- Answer: D
Explanation: The PR interval is determined by measuring from the beginning of the P wave to the
beginning of the QRS complex.
9) If you can't identify an R wave on the ECG tracing, which of the following wave(s) can you use to
determine the regularity of the ventricles?
A) Q and S wave junction
B) P and R wave junction
C) T wave
D) P wave - CORRECT ANSWER- Answer: A
Explanation: Occasionally, the QRS complex does not exhibit an R wave, in which case you can use the
point of the Q and S wave junction as an easy point of evaluation.
10) What is the rate of a normal sinus rhythm?
A) 60 to 100 bpm
B) 40 to 60 bpm
C) 100 to 150 bpm
D) Greater than 150 bpm - CORRECT ANSWER- Answer: A
Explanation: Both the atrial and ventricular rates are between 60 and 100 bpm in normal sinus rhythm.
11) Identify a rhythm using these criteria: regular rhythm, ventricular and atrial rates are 74
beats/minute, P wave precedes each QRS, PR interval and QRS duration within normal limits.
A) Sinus bradycardia
B) Sinus tachycardia
C) Normal sinus rhythm
