Relias Dysrhythmia Basic A - ECG/EKG
Interpretation Exam - Complete Questions
with Answers & Explanations || Latest Test
(Updated 2026-2027) | Graded A+
Question 1
Normal Sinus Rhythm:
Answer: Regular Rate: 60-100, P Wave: Present, upright, PR Interval: 0.12-0.20 sec,
QRS: <0.12 sec ✔✔
Rationale: Normal Sinus Rhythm (NSR) is the default rhythm of the heart. The SA
node fires at 60-100 bpm, producing a normal P wave (upright in lead II), consistent PR
interval (0.12-0.20 sec), and narrow QRS (<0.12 sec).
Question 2
Sinus Bradycardia:
Answer: Regular Rate: <60, P Wave: Present, upright, PR Interval: 0.12-0.20 sec,
QRS: <0.12 sec ✔✔
Rationale: Sinus bradycardia is a normal rhythm but with a rate below 60 bpm. It can
be normal in athletes or during sleep, but may indicate pathology such as increased
pg. 1
,vagal tone, hypothyroidism, or medication effects.
Question 3
Sinus Tachycardia:
Answer: Regular Rate: 100-150, P Wave: Present, upright, PR Interval: 0.12-0.20 sec,
QRS: <0.12 sec ✔✔
Rationale: Sinus tachycardia is a normal rhythm with a rate exceeding 100 bpm. It can
be caused by exercise, fever, pain, anxiety, dehydration, or medications. The hallmark is
a regular rhythm with normal P waves.
Question 4
Premature Atrial Contraction (PAC):
Answer: IRREGULAR Rate: depends on underlying rhythm, P wave: Present or hidden
in T wave, PR Interval: 0.12-0.20 sec, QRS: <0.12 sec ✔✔
Rationale: PACs are early beats originating from an ectopic focus in the atria. The P
wave may be hidden in the preceding T wave, making it difficult to identify. They are
pg. 2
, usually benign.
Question 5
Atrial Fibrillation:
Answer: IRREGULAR, Atrial rate: UNMEASURABLE, Ventricular rate: variable, P
wave: unable to see, PR Interval: N/A, QRS: <0.12 sec ✔✔
Rationale: Atrial fibrillation is characterized by chaotic atrial activity with no
discernible P waves. The ventricular response is irregularly irregular. It increases the
risk of stroke and requires anticoagulation.
Question 6
A Fib RVR (Atrial Fibrillation with Rapid Ventricular Response):
Answer: IRREGULAR, Ventricular rate: 100-175, P wave: unable to see, PR Interval:
N/A, QRS <0.12 sec ✔✔
Rationale: Atrial fibrillation with rapid ventricular response occurs when the
ventricular rate exceeds 100 bpm. The rapid rate can cause symptoms like palpitations,
pg. 3
Interpretation Exam - Complete Questions
with Answers & Explanations || Latest Test
(Updated 2026-2027) | Graded A+
Question 1
Normal Sinus Rhythm:
Answer: Regular Rate: 60-100, P Wave: Present, upright, PR Interval: 0.12-0.20 sec,
QRS: <0.12 sec ✔✔
Rationale: Normal Sinus Rhythm (NSR) is the default rhythm of the heart. The SA
node fires at 60-100 bpm, producing a normal P wave (upright in lead II), consistent PR
interval (0.12-0.20 sec), and narrow QRS (<0.12 sec).
Question 2
Sinus Bradycardia:
Answer: Regular Rate: <60, P Wave: Present, upright, PR Interval: 0.12-0.20 sec,
QRS: <0.12 sec ✔✔
Rationale: Sinus bradycardia is a normal rhythm but with a rate below 60 bpm. It can
be normal in athletes or during sleep, but may indicate pathology such as increased
pg. 1
,vagal tone, hypothyroidism, or medication effects.
Question 3
Sinus Tachycardia:
Answer: Regular Rate: 100-150, P Wave: Present, upright, PR Interval: 0.12-0.20 sec,
QRS: <0.12 sec ✔✔
Rationale: Sinus tachycardia is a normal rhythm with a rate exceeding 100 bpm. It can
be caused by exercise, fever, pain, anxiety, dehydration, or medications. The hallmark is
a regular rhythm with normal P waves.
Question 4
Premature Atrial Contraction (PAC):
Answer: IRREGULAR Rate: depends on underlying rhythm, P wave: Present or hidden
in T wave, PR Interval: 0.12-0.20 sec, QRS: <0.12 sec ✔✔
Rationale: PACs are early beats originating from an ectopic focus in the atria. The P
wave may be hidden in the preceding T wave, making it difficult to identify. They are
pg. 2
, usually benign.
Question 5
Atrial Fibrillation:
Answer: IRREGULAR, Atrial rate: UNMEASURABLE, Ventricular rate: variable, P
wave: unable to see, PR Interval: N/A, QRS: <0.12 sec ✔✔
Rationale: Atrial fibrillation is characterized by chaotic atrial activity with no
discernible P waves. The ventricular response is irregularly irregular. It increases the
risk of stroke and requires anticoagulation.
Question 6
A Fib RVR (Atrial Fibrillation with Rapid Ventricular Response):
Answer: IRREGULAR, Ventricular rate: 100-175, P wave: unable to see, PR Interval:
N/A, QRS <0.12 sec ✔✔
Rationale: Atrial fibrillation with rapid ventricular response occurs when the
ventricular rate exceeds 100 bpm. The rapid rate can cause symptoms like palpitations,
pg. 3
