Relias Dysrhythmia Basic A Exam (Latest 2025/2026 Update)
Complete Questions and Guide Answers, 100% Verified
Graded A+
250 ORIGINAL exam-style practice questions — not an official Relias exam, not leaked exam content, and not a claim that these
are proprietary/verified Relias questions.
Human torso/heart location schematic
1. What is the usual resting adult heart-rate range?
40–60 beats/min
60–100 beats/min
100–150 beats/min
150–250 beats/min
2. Which ECG component represents atrial depolarization?
P wave
QRS complex
T wave
U wave
3. Which ECG component primarily represents ventricular depolarization?
P wave
PR segment
QRS complex
T wave
4. Which waveform represents ventricular repolarization?
P wave
QRS complex
T wave
PR interval
5. One small ECG box represents how much time at standard paper speed?
Original practice material — not an official Relias exam Page 1
, 0.02 sec
0.04 sec
0.10 sec
0.20 sec
6. One large ECG box represents how much time at standard paper speed?
0.04 sec
0.10 sec
0.20 sec
0.40 sec
7. What is the normal PR interval?
0.04–0.10 sec
0.12–0.20 sec
0.21–0.30 sec
0.30–0.40 sec
8. A normal QRS duration is generally:
Less than 0.12 sec
0.12–0.20 sec
0.20–0.30 sec
Greater than 0.30 sec
9. A QRS duration of 0.16 sec is best described as:
Narrow
Normal
Wide
Absent
10. For a regular rhythm, which formula estimates rate from a standard ECG strip?
300 ÷ number of large boxes between R waves
60 ÷ number of P waves
1000 ÷ number of QRS complexes
PR × QRS
11. For a regular rhythm, which formula uses small boxes between consecutive R waves?
300 ÷ boxes
1500 ÷ boxes
100 ÷ boxes
2000 ÷ boxes
Original practice material — not an official Relias exam Page 2
, Standard ECG grid and normal sinus morphology
12. When assessing rhythm regularity, the nurse primarily compares:
P-wave height
R-R intervals
T-wave polarity
QT amplitude
13. The SA node is normally the heart's:
Primary pacemaker
AV valve
Ventricular backup only
Coronary artery
14. The intrinsic firing rate of the SA node is approximately:
20–40/min
40–60/min
60–100/min
100–150/min
15. The intrinsic rate of the AV junction is approximately:
20–40/min
40–60/min
60–100/min
100–180/min
16. The intrinsic ventricular escape rate is commonly:
20–40/min
20–50/min
60–100/min
120–180/min
17. A P wave before every QRS with a consistent PR interval suggests:
Sinus origin
Ventricular origin
Complete AV dissociation
Atrial fibrillation
18. A QRS that is narrow most strongly suggests ventricular activation through:
The normal His-Purkinje system
Original practice material — not an official Relias exam Page 3
, Only ventricular myocardium
No conduction system
An external pacemaker only
19. What is the best first step when beginning a rhythm interpretation?
Name the rhythm immediately
Determine regularity
Give an antiarrhythmic
Measure blood pressure only
20. A rhythm with identical R-R intervals is described as:
Regular
Irregular
Chaotic
Blocked
21. The QT interval represents ventricular:
Depolarization only
Repolarization only
Depolarization and repolarization
Atrial contraction only
22. At standard calibration, the vertical ECG grid is used primarily to measure:
Time only
Voltage/amplitude
Oxygen saturation
Blood pressure
23. If the ECG paper speed is 25 mm/sec, 5 small boxes equal:
0.04 sec
0.10 sec
0.20 sec
0.50 sec
24. Which finding makes a rhythm strip technically suspect?
Clear baseline
Consistent calibration
Excessive artifact obscuring QRS complexes
Visible P waves
25. A patient moves during ECG recording and the baseline becomes irregular. This is most consistent with:
Artifact
Atrial flutter
Third-degree block
Ventricular fibrillation
26. A rhythm is regular at 78/min with upright P waves before every QRS, PR 0.16 sec, QRS 0.08 sec. What is it?
Normal sinus rhythm
Sinus bradycardia
Sinus tachycardia
Junctional rhythm
Original practice material — not an official Relias exam Page 4
Complete Questions and Guide Answers, 100% Verified
Graded A+
250 ORIGINAL exam-style practice questions — not an official Relias exam, not leaked exam content, and not a claim that these
are proprietary/verified Relias questions.
Human torso/heart location schematic
1. What is the usual resting adult heart-rate range?
40–60 beats/min
60–100 beats/min
100–150 beats/min
150–250 beats/min
2. Which ECG component represents atrial depolarization?
P wave
QRS complex
T wave
U wave
3. Which ECG component primarily represents ventricular depolarization?
P wave
PR segment
QRS complex
T wave
4. Which waveform represents ventricular repolarization?
P wave
QRS complex
T wave
PR interval
5. One small ECG box represents how much time at standard paper speed?
Original practice material — not an official Relias exam Page 1
, 0.02 sec
0.04 sec
0.10 sec
0.20 sec
6. One large ECG box represents how much time at standard paper speed?
0.04 sec
0.10 sec
0.20 sec
0.40 sec
7. What is the normal PR interval?
0.04–0.10 sec
0.12–0.20 sec
0.21–0.30 sec
0.30–0.40 sec
8. A normal QRS duration is generally:
Less than 0.12 sec
0.12–0.20 sec
0.20–0.30 sec
Greater than 0.30 sec
9. A QRS duration of 0.16 sec is best described as:
Narrow
Normal
Wide
Absent
10. For a regular rhythm, which formula estimates rate from a standard ECG strip?
300 ÷ number of large boxes between R waves
60 ÷ number of P waves
1000 ÷ number of QRS complexes
PR × QRS
11. For a regular rhythm, which formula uses small boxes between consecutive R waves?
300 ÷ boxes
1500 ÷ boxes
100 ÷ boxes
2000 ÷ boxes
Original practice material — not an official Relias exam Page 2
, Standard ECG grid and normal sinus morphology
12. When assessing rhythm regularity, the nurse primarily compares:
P-wave height
R-R intervals
T-wave polarity
QT amplitude
13. The SA node is normally the heart's:
Primary pacemaker
AV valve
Ventricular backup only
Coronary artery
14. The intrinsic firing rate of the SA node is approximately:
20–40/min
40–60/min
60–100/min
100–150/min
15. The intrinsic rate of the AV junction is approximately:
20–40/min
40–60/min
60–100/min
100–180/min
16. The intrinsic ventricular escape rate is commonly:
20–40/min
20–50/min
60–100/min
120–180/min
17. A P wave before every QRS with a consistent PR interval suggests:
Sinus origin
Ventricular origin
Complete AV dissociation
Atrial fibrillation
18. A QRS that is narrow most strongly suggests ventricular activation through:
The normal His-Purkinje system
Original practice material — not an official Relias exam Page 3
, Only ventricular myocardium
No conduction system
An external pacemaker only
19. What is the best first step when beginning a rhythm interpretation?
Name the rhythm immediately
Determine regularity
Give an antiarrhythmic
Measure blood pressure only
20. A rhythm with identical R-R intervals is described as:
Regular
Irregular
Chaotic
Blocked
21. The QT interval represents ventricular:
Depolarization only
Repolarization only
Depolarization and repolarization
Atrial contraction only
22. At standard calibration, the vertical ECG grid is used primarily to measure:
Time only
Voltage/amplitude
Oxygen saturation
Blood pressure
23. If the ECG paper speed is 25 mm/sec, 5 small boxes equal:
0.04 sec
0.10 sec
0.20 sec
0.50 sec
24. Which finding makes a rhythm strip technically suspect?
Clear baseline
Consistent calibration
Excessive artifact obscuring QRS complexes
Visible P waves
25. A patient moves during ECG recording and the baseline becomes irregular. This is most consistent with:
Artifact
Atrial flutter
Third-degree block
Ventricular fibrillation
26. A rhythm is regular at 78/min with upright P waves before every QRS, PR 0.16 sec, QRS 0.08 sec. What is it?
Normal sinus rhythm
Sinus bradycardia
Sinus tachycardia
Junctional rhythm
Original practice material — not an official Relias exam Page 4
