Relias Advanced Dysrhythmia Exam A | 2025-
2026 Edition EKG Interpretation & Cardiac
Rhythm Mastery | Cardiology & Critical Care
SECTION 1: SINUS RHYTHMS (Questions 1-25)
Q1: Normal Sinus Rhythm
A rhythm strip shows a rate of 88 bpm, regular rhythm, normal P waves, PR interval 0.16
seconds, QRS 0.08 seconds. What is the rhythm?
,Answer: B) Normal sinus rhythm
Rationale: Rate 60-100 bpm, regular rhythm, normal P waves, PR 0.12-0.20 s, QRS <0.12 s
indicate normal sinus rhythm.
Q2: Atrial Fibrillation
A patient has a rhythm with no identifiable P waves, irregular rhythm, and QRS 0.10
seconds. What is the rhythm?
Answer: A) Atrial fibrillation
Rationale: Absent P waves and irregular rhythm are hallmarks of atrial fibrillation; normal QRS
rules out ventricular rhythms.
,Q3: Sinus Bradycardia
A rhythm strip shows a rate of 42 bpm, regular rhythm, normal P waves, PR 0.18
seconds, QRS 0.10 seconds. What is the rhythm?
Answer: C) Sinus bradycardia
Rationale: Rate <60 bpm with normal P waves and conduction indicates sinus bradycardia.
Rate is 42 bpm, well below the normal 60-100 range.
Q4: Sinus Tachycardia
, A rhythm strip shows a rate of 115 bpm, regular rhythm, normal P waves, PR 0.14
seconds, QRS 0.08 seconds. What is the rhythm?
Answer: B) Sinus tachycardia
Rationale: Rate >100 bpm with normal P waves and conduction indicates sinus tachycardia.
The rate of 115 bpm with normal morphology rules out other tachyarrhythmias.
Q5: Sinus Arrhythmia
2026 Edition EKG Interpretation & Cardiac
Rhythm Mastery | Cardiology & Critical Care
SECTION 1: SINUS RHYTHMS (Questions 1-25)
Q1: Normal Sinus Rhythm
A rhythm strip shows a rate of 88 bpm, regular rhythm, normal P waves, PR interval 0.16
seconds, QRS 0.08 seconds. What is the rhythm?
,Answer: B) Normal sinus rhythm
Rationale: Rate 60-100 bpm, regular rhythm, normal P waves, PR 0.12-0.20 s, QRS <0.12 s
indicate normal sinus rhythm.
Q2: Atrial Fibrillation
A patient has a rhythm with no identifiable P waves, irregular rhythm, and QRS 0.10
seconds. What is the rhythm?
Answer: A) Atrial fibrillation
Rationale: Absent P waves and irregular rhythm are hallmarks of atrial fibrillation; normal QRS
rules out ventricular rhythms.
,Q3: Sinus Bradycardia
A rhythm strip shows a rate of 42 bpm, regular rhythm, normal P waves, PR 0.18
seconds, QRS 0.10 seconds. What is the rhythm?
Answer: C) Sinus bradycardia
Rationale: Rate <60 bpm with normal P waves and conduction indicates sinus bradycardia.
Rate is 42 bpm, well below the normal 60-100 range.
Q4: Sinus Tachycardia
, A rhythm strip shows a rate of 115 bpm, regular rhythm, normal P waves, PR 0.14
seconds, QRS 0.08 seconds. What is the rhythm?
Answer: B) Sinus tachycardia
Rationale: Rate >100 bpm with normal P waves and conduction indicates sinus tachycardia.
The rate of 115 bpm with normal morphology rules out other tachyarrhythmias.
Q5: Sinus Arrhythmia
