Relias Dysrhythmias Exam B With Questions And Vverified
Solutions With Rationales.
Relias Dysrhythmias – Exam B (Practice Module)
Questions 1–30
Q1.
Which rhythm is characterized by a regular rhythm, rate of 60–100 bpm, upright P waves, and
consistent PR intervals?
A. Sinus bradycardia
B. Normal sinus rhythm
C. Atrial flutter
D. Junctional rhythm
Rationale:
Normal sinus rhythm has a rate of 60–100 bpm, regular rhythm, upright P waves before each QRS,
and a constant PR interval.
Q2.
A heart rate of 42 bpm with normal P waves and PR intervals indicates:
A. Junctional rhythm
B. Sinus bradycardia
C. Atrial fibrillation
D. First-degree AV block
Rationale:
Sinus bradycardia originates from the SA node but has a rate below 60 bpm.
Q3.
Which rhythm has no identifiable P waves and an irregularly irregular rhythm?
A. Atrial flutter
B. Atrial fibrillation
C. Sinus arrhythmia
D. Ventricular tachycardia
,Rationale:
Atrial fibrillation causes chaotic atrial activity, eliminating organized P waves and producing an
irregular ventricular response.
Q4.
A saw-tooth pattern on ECG is most consistent with:
A. Atrial fibrillation
B. Junctional rhythm
C. Atrial flutter
D. Ventricular fibrillation
Rationale:
Atrial flutter produces characteristic flutter (F) waves that resemble saw teeth.
Q5.
Which rhythm originates from the AV junction and usually has a rate of 40–60 bpm?
A. Sinus bradycardia
B. Atrial flutter
C. Junctional rhythm
D. Ventricular tachycardia
Rationale:
Junctional rhythms arise from the AV node when the SA node fails.
Q6.
In first-degree AV block, the PR interval is:
A. Variable
B. Shortened
C. Prolonged but constant
D. Absent
Rationale:
First-degree AV block delays conduction but does not drop beats.
Q7.
Which AV block shows progressive PR prolongation followed by a dropped QRS?
A. First-degree
B. Second-degree Type I (Wenckebach)
C. Second-degree Type II
D. Third-degree
, Rationale:
Wenckebach has gradual PR lengthening until conduction fails.
Q8.
Sudden dropped QRS complexes with consistent PR intervals indicate:
A. Wenckebach
B. Junctional rhythm
C. Second-degree Type II AV block
D. Sinus arrest
Rationale:
Type II blocks are dangerous and often progress to complete heart block.
Q9.
Complete dissociation between P waves and QRS complexes is seen in:
A. First-degree AV block
B. Third-degree AV block
C. Atrial fibrillation
D. Ventricular tachycardia
Rationale:
Third-degree AV block causes atria and ventricles to beat independently.
Q10.
Wide QRS complexes with a rate >100 bpm originating from the ventricles indicate:
A. SVT
B. Atrial flutter
C. Ventricular tachycardia
D. Junctional tachycardia
Rationale:
Ventricular tachycardia is life-threatening and requires rapid intervention.
Q11.
Which rhythm has no cardiac output and requires immediate defibrillation?
A. Asystole
B. Ventricular fibrillation
C. Sinus bradycardia
D. PEA
Solutions With Rationales.
Relias Dysrhythmias – Exam B (Practice Module)
Questions 1–30
Q1.
Which rhythm is characterized by a regular rhythm, rate of 60–100 bpm, upright P waves, and
consistent PR intervals?
A. Sinus bradycardia
B. Normal sinus rhythm
C. Atrial flutter
D. Junctional rhythm
Rationale:
Normal sinus rhythm has a rate of 60–100 bpm, regular rhythm, upright P waves before each QRS,
and a constant PR interval.
Q2.
A heart rate of 42 bpm with normal P waves and PR intervals indicates:
A. Junctional rhythm
B. Sinus bradycardia
C. Atrial fibrillation
D. First-degree AV block
Rationale:
Sinus bradycardia originates from the SA node but has a rate below 60 bpm.
Q3.
Which rhythm has no identifiable P waves and an irregularly irregular rhythm?
A. Atrial flutter
B. Atrial fibrillation
C. Sinus arrhythmia
D. Ventricular tachycardia
,Rationale:
Atrial fibrillation causes chaotic atrial activity, eliminating organized P waves and producing an
irregular ventricular response.
Q4.
A saw-tooth pattern on ECG is most consistent with:
A. Atrial fibrillation
B. Junctional rhythm
C. Atrial flutter
D. Ventricular fibrillation
Rationale:
Atrial flutter produces characteristic flutter (F) waves that resemble saw teeth.
Q5.
Which rhythm originates from the AV junction and usually has a rate of 40–60 bpm?
A. Sinus bradycardia
B. Atrial flutter
C. Junctional rhythm
D. Ventricular tachycardia
Rationale:
Junctional rhythms arise from the AV node when the SA node fails.
Q6.
In first-degree AV block, the PR interval is:
A. Variable
B. Shortened
C. Prolonged but constant
D. Absent
Rationale:
First-degree AV block delays conduction but does not drop beats.
Q7.
Which AV block shows progressive PR prolongation followed by a dropped QRS?
A. First-degree
B. Second-degree Type I (Wenckebach)
C. Second-degree Type II
D. Third-degree
, Rationale:
Wenckebach has gradual PR lengthening until conduction fails.
Q8.
Sudden dropped QRS complexes with consistent PR intervals indicate:
A. Wenckebach
B. Junctional rhythm
C. Second-degree Type II AV block
D. Sinus arrest
Rationale:
Type II blocks are dangerous and often progress to complete heart block.
Q9.
Complete dissociation between P waves and QRS complexes is seen in:
A. First-degree AV block
B. Third-degree AV block
C. Atrial fibrillation
D. Ventricular tachycardia
Rationale:
Third-degree AV block causes atria and ventricles to beat independently.
Q10.
Wide QRS complexes with a rate >100 bpm originating from the ventricles indicate:
A. SVT
B. Atrial flutter
C. Ventricular tachycardia
D. Junctional tachycardia
Rationale:
Ventricular tachycardia is life-threatening and requires rapid intervention.
Q11.
Which rhythm has no cardiac output and requires immediate defibrillation?
A. Asystole
B. Ventricular fibrillation
C. Sinus bradycardia
D. PEA
