Relias Dysrhythmia Basic Test 35 Questions and Answers
2026/2027 (Basic A Dysrhythmia)
Section 1: ECG Basics and Electrophysiology
1. What does the "P" wave represent on an ECG strip?
A) Ventricular depolarization
B) Ventricular repolarization
C) Atrial depolarization
D) Atrial repolarization
CORRECT ANSWER>: C
Rationale: The P wave represents the electrical impulse traveling through the atria, causing
atrial depolarization (contraction).
2. What is the normal duration of the PR interval?
A) 0.04 - 0.10 seconds
B) 0.12 - 0.20 seconds
C) 0.24 - 0.28 seconds
D) 0.30 - 0.40 seconds
CORRECT ANSWER>: B
Rationale: The normal PR interval (measured from the beginning of the P wave to the beginning
of the QRS complex) is 0.12 to 0.20 seconds. It represents the delay of the electrical impulse at
the AV node.
3. Which portion of the ECG complex represents ventricular depolarization?
A) P wave
B) PR interval
C) QRS complex
, D) T wave
CORRECT ANSWER>: C
Rationale: The QRS complex represents the spread of the electrical impulse through the
ventricles, causing ventricular depolarization (contraction).
4. On a standard ECG monitor, how much time does one small box represent?
A) 0.04 seconds
B) 0.10 seconds
C) 0.20 seconds
D) 1.0 second
CORRECT ANSWER>: A
Rationale: Each small box is 1 mm wide and represents 0.04 seconds. One large box (5 small
boxes) represents 0.20 seconds.
5. What does the T wave represent?
A) Atrial repolarization
B) Ventricular repolarization
C) Ventricular depolarization
D) AV node delay
CORRECT ANSWER>: B
Rationale: The T wave represents ventricular repolarization (the resting state/recovery of the
ventricles). Atrial repolarization is hidden within the QRS complex.
Section 2: Sinus Rhythms
6. Which of the following is a characteristic of Normal Sinus Rhythm (NSR)?
A) Rate of 110 bpm
B) PR interval of 0.24 seconds
2026/2027 (Basic A Dysrhythmia)
Section 1: ECG Basics and Electrophysiology
1. What does the "P" wave represent on an ECG strip?
A) Ventricular depolarization
B) Ventricular repolarization
C) Atrial depolarization
D) Atrial repolarization
CORRECT ANSWER>: C
Rationale: The P wave represents the electrical impulse traveling through the atria, causing
atrial depolarization (contraction).
2. What is the normal duration of the PR interval?
A) 0.04 - 0.10 seconds
B) 0.12 - 0.20 seconds
C) 0.24 - 0.28 seconds
D) 0.30 - 0.40 seconds
CORRECT ANSWER>: B
Rationale: The normal PR interval (measured from the beginning of the P wave to the beginning
of the QRS complex) is 0.12 to 0.20 seconds. It represents the delay of the electrical impulse at
the AV node.
3. Which portion of the ECG complex represents ventricular depolarization?
A) P wave
B) PR interval
C) QRS complex
, D) T wave
CORRECT ANSWER>: C
Rationale: The QRS complex represents the spread of the electrical impulse through the
ventricles, causing ventricular depolarization (contraction).
4. On a standard ECG monitor, how much time does one small box represent?
A) 0.04 seconds
B) 0.10 seconds
C) 0.20 seconds
D) 1.0 second
CORRECT ANSWER>: A
Rationale: Each small box is 1 mm wide and represents 0.04 seconds. One large box (5 small
boxes) represents 0.20 seconds.
5. What does the T wave represent?
A) Atrial repolarization
B) Ventricular repolarization
C) Ventricular depolarization
D) AV node delay
CORRECT ANSWER>: B
Rationale: The T wave represents ventricular repolarization (the resting state/recovery of the
ventricles). Atrial repolarization is hidden within the QRS complex.
Section 2: Sinus Rhythms
6. Which of the following is a characteristic of Normal Sinus Rhythm (NSR)?
A) Rate of 110 bpm
B) PR interval of 0.24 seconds
