Page 1 of 222
RELIAS DYSRHYTHMIA BASIC A 2026/2027
ACTUAL TEST ACCURATE QUESTIONS AND
CORRECT DETAILED ANSWERS (100%
CORRECT VERIFIED SOLUTIONS) A NEW
UPDATED VERSION |ALREADY GRADED A+
(BRAND NEW!) RELIAS DYSRHYTHMIA BASIC
A
1. A nurse is reviewing an ECG strip. To accurately calculate
the ventricular rate for a regular rhythm, which method is
most precise?
,Page 2 of 222
A. Count the number of QRS complexes in a 6-second strip
and multiply by 10.
B. Divide 300 by the number of large boxes between two R
waves (R-R interval).
C. Count the number of small boxes between two R waves
and divide by 1500.
D. Multiply the number of P waves by 10.
Correct Answer: B. Divide 300 by the number of large boxes
between two R waves (R-R interval).
Rationale: For regular rhythms, the "300 method" (300 / # of
large boxes between R waves) is highly accurate. A 6-second
count (Option A) is best for irregular rhythms. Option C is
formulaic but less efficient clinically. Option D calculates atrial
rate, not ventricular.
2. A student nurse asks what the "PR interval" represents
electrically. What is the correct physiological explanation?
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A. The time it takes for the ventricles to contract and eject
blood.
B. The total time of ventricular depolarization.
C. The time from the onset of atrial depolarization to the
onset of ventricular depolarization.
D. The refractory period following the QRS complex.
Correct Answer: C. The time from the onset of atrial
depolarization to the onset of ventricular depolarization.
Rationale: The PR interval measures conduction through the AV
node and the His-Purkinje system before ventricular contraction.
It starts at the beginning of the P wave (atrial kick) and ends
at the Q wave (ventricular depolarization start).
3. On standard ECG paper, a small box represents 0.04
seconds. A QRS complex measuring 3 small boxes wide
would be documented as:
A. 0.04 seconds
B. 0.12 seconds
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C. 0.20 seconds
D. 0.36 seconds
Correct Answer: B. 0.12 seconds
Rationale: Calculation: 3 small boxes × 0.04 seconds/box =
0.12 seconds. A normal QRS is <0.12 seconds. A
measurement of exactly 0.12 seconds represents
intraventricular conduction delay or incomplete bundle branch
block.
4. A patient's ECG shows a prolonged QT interval. The
nurse understands this places the patient at highest risk for
which dysrhythmia?
A. Atrial fibrillation
B. Supraventricular tachycardia
C. Torsade de Pointes
D. Asystole
Correct Answer: C. Torsade de Pointes
RELIAS DYSRHYTHMIA BASIC A 2026/2027
ACTUAL TEST ACCURATE QUESTIONS AND
CORRECT DETAILED ANSWERS (100%
CORRECT VERIFIED SOLUTIONS) A NEW
UPDATED VERSION |ALREADY GRADED A+
(BRAND NEW!) RELIAS DYSRHYTHMIA BASIC
A
1. A nurse is reviewing an ECG strip. To accurately calculate
the ventricular rate for a regular rhythm, which method is
most precise?
,Page 2 of 222
A. Count the number of QRS complexes in a 6-second strip
and multiply by 10.
B. Divide 300 by the number of large boxes between two R
waves (R-R interval).
C. Count the number of small boxes between two R waves
and divide by 1500.
D. Multiply the number of P waves by 10.
Correct Answer: B. Divide 300 by the number of large boxes
between two R waves (R-R interval).
Rationale: For regular rhythms, the "300 method" (300 / # of
large boxes between R waves) is highly accurate. A 6-second
count (Option A) is best for irregular rhythms. Option C is
formulaic but less efficient clinically. Option D calculates atrial
rate, not ventricular.
2. A student nurse asks what the "PR interval" represents
electrically. What is the correct physiological explanation?
,Page 3 of 222
A. The time it takes for the ventricles to contract and eject
blood.
B. The total time of ventricular depolarization.
C. The time from the onset of atrial depolarization to the
onset of ventricular depolarization.
D. The refractory period following the QRS complex.
Correct Answer: C. The time from the onset of atrial
depolarization to the onset of ventricular depolarization.
Rationale: The PR interval measures conduction through the AV
node and the His-Purkinje system before ventricular contraction.
It starts at the beginning of the P wave (atrial kick) and ends
at the Q wave (ventricular depolarization start).
3. On standard ECG paper, a small box represents 0.04
seconds. A QRS complex measuring 3 small boxes wide
would be documented as:
A. 0.04 seconds
B. 0.12 seconds
, Page 4 of 222
C. 0.20 seconds
D. 0.36 seconds
Correct Answer: B. 0.12 seconds
Rationale: Calculation: 3 small boxes × 0.04 seconds/box =
0.12 seconds. A normal QRS is <0.12 seconds. A
measurement of exactly 0.12 seconds represents
intraventricular conduction delay or incomplete bundle branch
block.
4. A patient's ECG shows a prolonged QT interval. The
nurse understands this places the patient at highest risk for
which dysrhythmia?
A. Atrial fibrillation
B. Supraventricular tachycardia
C. Torsade de Pointes
D. Asystole
Correct Answer: C. Torsade de Pointes
