Relias Dysrhythmia Basic A Practice Test 2026 | Verified
Answers | Exam Prep
1. A normal P-R interval on a standard ECG should range from:
0.20 - 0.80 ms.
0.12 - 0.20 ms.
0.04 - 0.10 ms.
0.04 - 0.12 ms.
2. In a patient with a history of heart disease, if an ECG shows unifocal PVCs,
what might be the clinical implication?
The presence of unifocal PVCs is irrelevant in patients with heart
disease.
The presence of unifocal PVCs may suggest a stable ectopic focus
but requires monitoring for potential progression.
The presence of unifocal PVCs indicates an immediate need for
defibrillation.
The presence of unifocal PVCs means the patient is in heart failure.
3. Which of the following best describes an accelerated idioventricular rhythm
(AIVR)?
Essentially regular ventricular rhythm with QRS complexes
measuring 0.12 seconds or greater; atrial rate not discernible;
ventricular rate 41 to 100 beats/min
Gradual alteration in the amplitude and direction of the QRS; atrial
rate indiscernible, ventricular rate 150 to 250 beats/min
Regular ventricular rhythm with QRS complexes measuring 0.10
, seconds or less; P waves may occur before, during, or after the QRS;
ventricular rate 41 to 60 beats/min
Rapid, chaotic rhythm with no pattern or regularity
4. If a patient presents with a heart rhythm showing a progressively longer PR
interval followed by a dropped QRS complex, what diagnosis would be most
appropriate?
Atrial fibrillation
2nd degree AV block Type I
Normal sinus rhythm
3rd degree AV block
5. Which of the following statements about Ventricular Trigeminy is accurate?
It is the least common form of ventricular arrhythmia.
It involves a sequence where two normal heartbeats are followed
by a PVC.
It involves two PVCs occurring back-to-back.
It's a pattern where every heartbeat is a PVC.
6. In a clinical scenario, if a patient presents with an atrial rate of 300 beats per
minute and flutter waves on the ECG, what condition is most likely indicated?
Normal sinus rhythm
Ventricular tachycardia
Atrial flutter
Atrial fibrillation
7. Describe the significance of the absence of P waves in accelerated
idioventricular rhythm.
, The absence of P waves indicates that the rhythm originates from
the ventricles rather than the atria.
The absence of P waves is irrelevant to the rhythm's classification.
The absence of P waves suggests a normal conduction pathway.
The absence of P waves means the heart rate is too slow.
8. Describe the significance of the PR interval in an ECG reading.
The PR interval reflects the time taken for electrical impulses to
travel from the atria to the ventricles, indicating proper conduction
through the AV node.
The PR interval indicates the presence of ventricular arrhythmias.
The PR interval measures the heart rate during tachycardia.
The PR interval is unrelated to heart rhythm analysis.
9. Describe the significance of the QT interval in ECG readings.
The QT interval represents the time taken for the heart's ventricles to
depolarize and repolarize, which is crucial for assessing cardiac
rhythm and potential arrhythmias.
The QT interval measures the time between heartbeats and is
irrelevant in arrhythmia assessment.
The QT interval is the duration of the P wave and is important for
diagnosing AV blocks.
The QT interval indicates the heart rate and is used to measure blood
pressure.
10. Which of the following is true regarding junctional tachycardia?
QRS >.12 seconds
None of the above
, PRI will >.12 seconds
R-R intervals are irregular
P waves will be inverted; can fall before or after the QRS complex
or can be hidden in complex
Rate is <60 bpm
11. What is the heart rate range for supraventricular tachycardia (SVT)?
100-150 beats per minute
150-350 beats per minute
350-450 beats per minute
60-100 beats per minute
12. How does the ventricular rate in atrial fibrillation differ from that in normal
sinus rhythm?
The ventricular rate in atrial fibrillation is the same as in normal sinus
rhythm.
The ventricular rate in atrial fibrillation is variable, unlike the
consistent rate in normal sinus rhythm.
The ventricular rate in atrial fibrillation is always lower than in normal
sinus rhythm.
The ventricular rate in atrial fibrillation is always higher than in normal
sinus rhythm.
13. A Third Degree AV block on an ECG can indicate some version of
no electrical connection between the atria
no electrical connection between each ventricle
no electrical connection between the atria and the ventricles, with
ventricular contraction often absent
Answers | Exam Prep
1. A normal P-R interval on a standard ECG should range from:
0.20 - 0.80 ms.
0.12 - 0.20 ms.
0.04 - 0.10 ms.
0.04 - 0.12 ms.
2. In a patient with a history of heart disease, if an ECG shows unifocal PVCs,
what might be the clinical implication?
The presence of unifocal PVCs is irrelevant in patients with heart
disease.
The presence of unifocal PVCs may suggest a stable ectopic focus
but requires monitoring for potential progression.
The presence of unifocal PVCs indicates an immediate need for
defibrillation.
The presence of unifocal PVCs means the patient is in heart failure.
3. Which of the following best describes an accelerated idioventricular rhythm
(AIVR)?
Essentially regular ventricular rhythm with QRS complexes
measuring 0.12 seconds or greater; atrial rate not discernible;
ventricular rate 41 to 100 beats/min
Gradual alteration in the amplitude and direction of the QRS; atrial
rate indiscernible, ventricular rate 150 to 250 beats/min
Regular ventricular rhythm with QRS complexes measuring 0.10
, seconds or less; P waves may occur before, during, or after the QRS;
ventricular rate 41 to 60 beats/min
Rapid, chaotic rhythm with no pattern or regularity
4. If a patient presents with a heart rhythm showing a progressively longer PR
interval followed by a dropped QRS complex, what diagnosis would be most
appropriate?
Atrial fibrillation
2nd degree AV block Type I
Normal sinus rhythm
3rd degree AV block
5. Which of the following statements about Ventricular Trigeminy is accurate?
It is the least common form of ventricular arrhythmia.
It involves a sequence where two normal heartbeats are followed
by a PVC.
It involves two PVCs occurring back-to-back.
It's a pattern where every heartbeat is a PVC.
6. In a clinical scenario, if a patient presents with an atrial rate of 300 beats per
minute and flutter waves on the ECG, what condition is most likely indicated?
Normal sinus rhythm
Ventricular tachycardia
Atrial flutter
Atrial fibrillation
7. Describe the significance of the absence of P waves in accelerated
idioventricular rhythm.
, The absence of P waves indicates that the rhythm originates from
the ventricles rather than the atria.
The absence of P waves is irrelevant to the rhythm's classification.
The absence of P waves suggests a normal conduction pathway.
The absence of P waves means the heart rate is too slow.
8. Describe the significance of the PR interval in an ECG reading.
The PR interval reflects the time taken for electrical impulses to
travel from the atria to the ventricles, indicating proper conduction
through the AV node.
The PR interval indicates the presence of ventricular arrhythmias.
The PR interval measures the heart rate during tachycardia.
The PR interval is unrelated to heart rhythm analysis.
9. Describe the significance of the QT interval in ECG readings.
The QT interval represents the time taken for the heart's ventricles to
depolarize and repolarize, which is crucial for assessing cardiac
rhythm and potential arrhythmias.
The QT interval measures the time between heartbeats and is
irrelevant in arrhythmia assessment.
The QT interval is the duration of the P wave and is important for
diagnosing AV blocks.
The QT interval indicates the heart rate and is used to measure blood
pressure.
10. Which of the following is true regarding junctional tachycardia?
QRS >.12 seconds
None of the above
, PRI will >.12 seconds
R-R intervals are irregular
P waves will be inverted; can fall before or after the QRS complex
or can be hidden in complex
Rate is <60 bpm
11. What is the heart rate range for supraventricular tachycardia (SVT)?
100-150 beats per minute
150-350 beats per minute
350-450 beats per minute
60-100 beats per minute
12. How does the ventricular rate in atrial fibrillation differ from that in normal
sinus rhythm?
The ventricular rate in atrial fibrillation is the same as in normal sinus
rhythm.
The ventricular rate in atrial fibrillation is variable, unlike the
consistent rate in normal sinus rhythm.
The ventricular rate in atrial fibrillation is always lower than in normal
sinus rhythm.
The ventricular rate in atrial fibrillation is always higher than in normal
sinus rhythm.
13. A Third Degree AV block on an ECG can indicate some version of
no electrical connection between the atria
no electrical connection between each ventricle
no electrical connection between the atria and the ventricles, with
ventricular contraction often absent
