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RELIAS DYSRHYTHMIA BASIC TEST ANSWERS 2026/2027 |
Basic A Dysrhythmia | Verified Questions & Answers |
Complete ECG Interpretation | Pass Guaranteed - A+ Graded
Section 1: Sinus Rhythms & Identification (Q1-8)
Q1. A rhythm strip shows a regular rhythm with a rate of approximately 75 bpm.
There are upright P waves present before each QRS complex in lead II. The PR
interval is constant at 0.16 seconds, and the QRS duration is narrow at 0.08 seconds.
What is the rhythm? A. Sinus bradycardia B. Sinus tachycardia C. Normal sinus
rhythm [CORRECT] D. Sinus arrhythmia
Rationale: Normal sinus rhythm requires a regular rhythm, rate 60-100 bpm, upright
P waves before each QRS, a normal PR interval (0.12-0.20 seconds), and narrow QRS
complexes. The other options are incorrect because the rate is neither too slow nor
too fast, and the rhythm is regular without respiratory variation.
Correct Answer: C
Q2. A patient is found to have a heart rate of 52 bpm on the cardiac monitor. The
rhythm is regular with upright P waves before each QRS complex, a normal PR
interval of 0.18 seconds, and narrow QRS complexes. The patient is asymptomatic
with normal blood pressure. What is the most appropriate management? A.
Administer atropine 0.5 mg IV immediately B. Prepare for transcutaneous pacing C.
Continue monitoring; no treatment needed if asymptomatic [CORRECT] D. Perform
synchronized cardioversion
Rationale: Sinus bradycardia is defined as a sinus rhythm with a rate less than 60
bpm. In asymptomatic patients, treatment is not required; atropine and pacing are
reserved for symptomatic bradycardia. Cardioversion is inappropriate for bradycardic
rhythms.
Correct Answer: C
Q3. Which of the following is the correct criteria for sinus tachycardia? A. Sinus
rhythm with a rate less than 60 bpm B. Sinus rhythm with a rate greater than 100
bpm [CORRECT] C. Sinus rhythm with an irregularly irregular rate D. Sinus rhythm
with a rate between 40-60 bpm
, 2
Rationale: Sinus tachycardia is defined as a sinus rhythm with a rate greater than 100
bpm. The primary treatment is addressing the underlying cause. The other options
describe sinus bradycardia, atrial fibrillation, and junctional rhythm respectively.
Correct Answer: B
Q4. A rhythm strip shows a slightly irregular rhythm with a rate varying between 68-
78 bpm. Upright P waves are present before each QRS complex, but the PP interval
varies by more than 0.12 seconds. The PR interval is normal and constant, and the
QRS complexes are narrow. The variation increases with the patient's respiration.
What is the rhythm? A. Atrial fibrillation B. Sinus arrhythmia [CORRECT] C. Sinus
tachycardia D. Wandering atrial pacemaker
Rationale: Sinus arrhythmia is characterized by a phasic variation in the PP interval
greater than 0.12 seconds, typically related to respiration, with normal P waves and a
normal PR interval. Atrial fibrillation lacks P waves, and WAP shows multiple P wave
morphologies rather than respiratory variation.
Correct Answer: B
Q5. A rhythm strip shows a normal sinus rhythm at 70 bpm. Suddenly, there is a
pause in the rhythm with no P wave, QRS complex, or T wave during the pause. The
duration of the pause is not a multiple of the underlying PP interval. After the pause,
the normal sinus rhythm resumes. What is this finding? A. Second-degree AV block
Type I B. Sinus pause/arrest [CORRECT] C. Third-degree AV block D. Sinus exit block
Rationale: Sinus pause or sinus arrest occurs when the sinus node fails to generate an
impulse, resulting in a pause without PQRST activity that is not a multiple of the
underlying PP interval. AV blocks involve P waves that are not conducted, and sinus
exit block typically shows pauses that are multiples of the PP interval.
Correct Answer: B
Q6. A rhythm strip shows a regular narrow-complex rhythm. Using the large box
method, the R-R interval spans exactly 4 large boxes on the ECG grid. What is the
calculated heart rate? A. 50 bpm B. 75 bpm [CORRECT] C. 100 bpm D. 150 bpm
Rationale: The 300 method calculates rate by dividing 300 by the number of large
boxes between R waves; 300 ÷ 4 = 75 bpm. This is a standard application of the large
box counting method for regular rhythms.
RELIAS DYSRHYTHMIA BASIC TEST ANSWERS 2026/2027 |
Basic A Dysrhythmia | Verified Questions & Answers |
Complete ECG Interpretation | Pass Guaranteed - A+ Graded
Section 1: Sinus Rhythms & Identification (Q1-8)
Q1. A rhythm strip shows a regular rhythm with a rate of approximately 75 bpm.
There are upright P waves present before each QRS complex in lead II. The PR
interval is constant at 0.16 seconds, and the QRS duration is narrow at 0.08 seconds.
What is the rhythm? A. Sinus bradycardia B. Sinus tachycardia C. Normal sinus
rhythm [CORRECT] D. Sinus arrhythmia
Rationale: Normal sinus rhythm requires a regular rhythm, rate 60-100 bpm, upright
P waves before each QRS, a normal PR interval (0.12-0.20 seconds), and narrow QRS
complexes. The other options are incorrect because the rate is neither too slow nor
too fast, and the rhythm is regular without respiratory variation.
Correct Answer: C
Q2. A patient is found to have a heart rate of 52 bpm on the cardiac monitor. The
rhythm is regular with upright P waves before each QRS complex, a normal PR
interval of 0.18 seconds, and narrow QRS complexes. The patient is asymptomatic
with normal blood pressure. What is the most appropriate management? A.
Administer atropine 0.5 mg IV immediately B. Prepare for transcutaneous pacing C.
Continue monitoring; no treatment needed if asymptomatic [CORRECT] D. Perform
synchronized cardioversion
Rationale: Sinus bradycardia is defined as a sinus rhythm with a rate less than 60
bpm. In asymptomatic patients, treatment is not required; atropine and pacing are
reserved for symptomatic bradycardia. Cardioversion is inappropriate for bradycardic
rhythms.
Correct Answer: C
Q3. Which of the following is the correct criteria for sinus tachycardia? A. Sinus
rhythm with a rate less than 60 bpm B. Sinus rhythm with a rate greater than 100
bpm [CORRECT] C. Sinus rhythm with an irregularly irregular rate D. Sinus rhythm
with a rate between 40-60 bpm
, 2
Rationale: Sinus tachycardia is defined as a sinus rhythm with a rate greater than 100
bpm. The primary treatment is addressing the underlying cause. The other options
describe sinus bradycardia, atrial fibrillation, and junctional rhythm respectively.
Correct Answer: B
Q4. A rhythm strip shows a slightly irregular rhythm with a rate varying between 68-
78 bpm. Upright P waves are present before each QRS complex, but the PP interval
varies by more than 0.12 seconds. The PR interval is normal and constant, and the
QRS complexes are narrow. The variation increases with the patient's respiration.
What is the rhythm? A. Atrial fibrillation B. Sinus arrhythmia [CORRECT] C. Sinus
tachycardia D. Wandering atrial pacemaker
Rationale: Sinus arrhythmia is characterized by a phasic variation in the PP interval
greater than 0.12 seconds, typically related to respiration, with normal P waves and a
normal PR interval. Atrial fibrillation lacks P waves, and WAP shows multiple P wave
morphologies rather than respiratory variation.
Correct Answer: B
Q5. A rhythm strip shows a normal sinus rhythm at 70 bpm. Suddenly, there is a
pause in the rhythm with no P wave, QRS complex, or T wave during the pause. The
duration of the pause is not a multiple of the underlying PP interval. After the pause,
the normal sinus rhythm resumes. What is this finding? A. Second-degree AV block
Type I B. Sinus pause/arrest [CORRECT] C. Third-degree AV block D. Sinus exit block
Rationale: Sinus pause or sinus arrest occurs when the sinus node fails to generate an
impulse, resulting in a pause without PQRST activity that is not a multiple of the
underlying PP interval. AV blocks involve P waves that are not conducted, and sinus
exit block typically shows pauses that are multiples of the PP interval.
Correct Answer: B
Q6. A rhythm strip shows a regular narrow-complex rhythm. Using the large box
method, the R-R interval spans exactly 4 large boxes on the ECG grid. What is the
calculated heart rate? A. 50 bpm B. 75 bpm [CORRECT] C. 100 bpm D. 150 bpm
Rationale: The 300 method calculates rate by dividing 300 by the number of large
boxes between R waves; 300 ÷ 4 = 75 bpm. This is a standard application of the large
box counting method for regular rhythms.
