BASIC ARRHYTHMIA Sentara Test 2
Questions and Answers Graded A+, AV
Blocks and Tachyarrhythmias Exam
1. A PR interval longer than 0.20 seconds with every P wave followed by a
QRS suggests:
A. First-degree AV block
B. Mobitz I
C. Mobitz II
D. Complete heart block
Answer: A
Rationale: First-degree AV block is a prolonged PR interval with 1:1
conduction.
2. Which rhythm shows progressive PR prolongation before a dropped QRS?
A. First-degree AV block
B. Mobitz I
C. Mobitz II
D. Complete heart block
Answer: B
Rationale: Wenckebach is defined by progressive PR lengthening until a
beat is dropped.
3. A fixed PR interval with intermittent dropped QRS complexes is most
consistent with:
A. Mobitz I
B. Mobitz II
C. Sinus arrhythmia
D. Atrial flutter
Answer: B
Rationale: Mobitz II has constant PR intervals with sudden non-conducted
P waves.
4. The greatest concern with Mobitz II is progression to:
A. Sinus tachycardia
B. Complete heart block
, C. Atrial fibrillation
D. PACs
Answer: B
Rationale: Mobitz II can worsen to complete AV block.
5. Third-degree AV block is characterized by:
A. PR interval greater than 0.20 seconds
B. Progressive PR prolongation
C. AV dissociation
D. Sawtooth flutter waves
Answer: C
Rationale: Complete heart block means atria and ventricles beat
independently.
6. In complete heart block, the ventricular rhythm is usually:
A. Faster than atrial rate
B. Independent of atrial activity and often slow
C. Always 150 bpm
D. Irregularly irregular
Answer: B
Rationale: A ventricular escape rhythm maintains a slower independent
rate.
7. Which rhythm is most likely to produce a narrow QRS and a regular rate of
45 bpm?
A. Junctional escape rhythm
B. Ventricular tachycardia
C. Atrial fibrillation
D. Mobitz II
Answer: A
Rationale: Junctional escape rhythms often appear at 40 to 60 bpm with
narrow QRS.
8. A patient with a slow regular rhythm, no visible P waves, and narrow QRS
complexes likely has:
A. Junctional escape rhythm
B. Ventricular fibrillation
C. Atrial flutter
D. Complete heart block
, Answer: A
Rationale: Junctional rhythms often suppress or hide P waves.
9. A PR interval that gradually lengthens before a QRS drop most likely
indicates:
A. Mobitz II
B. Mobitz I
C. First-degree AV block
D. Sinus tachycardia
Answer: B
Rationale: This is the classic Wenckebach pattern.
10.Which AV block is usually more benign?
A. Mobitz I
B. Mobitz II
C. Third-degree block
D. Advanced block
Answer: A
Rationale: Mobitz I is generally less dangerous than Mobitz II or complete
block.
11.A patient with first-degree AV block usually has:
A. Dropped beats
B. No P waves
C. Delayed conduction but every impulse conducts
D. Ventricular escape rhythm
Answer: C
Rationale: First-degree block is a conduction delay, not a failure of
conduction.
12.In first-degree AV block, the rhythm is usually:
A. Irregularly irregular
B. Regular
C. Chaotic
D. Completely absent
Answer: B
Rationale: Every atrial impulse still reaches the ventricle.
13.Which finding supports Mobitz II rather than Mobitz I?
A. Progressive PR prolongation
Questions and Answers Graded A+, AV
Blocks and Tachyarrhythmias Exam
1. A PR interval longer than 0.20 seconds with every P wave followed by a
QRS suggests:
A. First-degree AV block
B. Mobitz I
C. Mobitz II
D. Complete heart block
Answer: A
Rationale: First-degree AV block is a prolonged PR interval with 1:1
conduction.
2. Which rhythm shows progressive PR prolongation before a dropped QRS?
A. First-degree AV block
B. Mobitz I
C. Mobitz II
D. Complete heart block
Answer: B
Rationale: Wenckebach is defined by progressive PR lengthening until a
beat is dropped.
3. A fixed PR interval with intermittent dropped QRS complexes is most
consistent with:
A. Mobitz I
B. Mobitz II
C. Sinus arrhythmia
D. Atrial flutter
Answer: B
Rationale: Mobitz II has constant PR intervals with sudden non-conducted
P waves.
4. The greatest concern with Mobitz II is progression to:
A. Sinus tachycardia
B. Complete heart block
, C. Atrial fibrillation
D. PACs
Answer: B
Rationale: Mobitz II can worsen to complete AV block.
5. Third-degree AV block is characterized by:
A. PR interval greater than 0.20 seconds
B. Progressive PR prolongation
C. AV dissociation
D. Sawtooth flutter waves
Answer: C
Rationale: Complete heart block means atria and ventricles beat
independently.
6. In complete heart block, the ventricular rhythm is usually:
A. Faster than atrial rate
B. Independent of atrial activity and often slow
C. Always 150 bpm
D. Irregularly irregular
Answer: B
Rationale: A ventricular escape rhythm maintains a slower independent
rate.
7. Which rhythm is most likely to produce a narrow QRS and a regular rate of
45 bpm?
A. Junctional escape rhythm
B. Ventricular tachycardia
C. Atrial fibrillation
D. Mobitz II
Answer: A
Rationale: Junctional escape rhythms often appear at 40 to 60 bpm with
narrow QRS.
8. A patient with a slow regular rhythm, no visible P waves, and narrow QRS
complexes likely has:
A. Junctional escape rhythm
B. Ventricular fibrillation
C. Atrial flutter
D. Complete heart block
, Answer: A
Rationale: Junctional rhythms often suppress or hide P waves.
9. A PR interval that gradually lengthens before a QRS drop most likely
indicates:
A. Mobitz II
B. Mobitz I
C. First-degree AV block
D. Sinus tachycardia
Answer: B
Rationale: This is the classic Wenckebach pattern.
10.Which AV block is usually more benign?
A. Mobitz I
B. Mobitz II
C. Third-degree block
D. Advanced block
Answer: A
Rationale: Mobitz I is generally less dangerous than Mobitz II or complete
block.
11.A patient with first-degree AV block usually has:
A. Dropped beats
B. No P waves
C. Delayed conduction but every impulse conducts
D. Ventricular escape rhythm
Answer: C
Rationale: First-degree block is a conduction delay, not a failure of
conduction.
12.In first-degree AV block, the rhythm is usually:
A. Irregularly irregular
B. Regular
C. Chaotic
D. Completely absent
Answer: B
Rationale: Every atrial impulse still reaches the ventricle.
13.Which finding supports Mobitz II rather than Mobitz I?
A. Progressive PR prolongation
