Relias Dysrhythmia Basic A
Final Test Review
(Questions & Solutions)
2025
1
,1. A 68-year-old patient’s intrinsic sinoatrial (SA) node fires at 55 beats
per minute. Which description best characterizes this rate?
A. Normal sinus rate
B. Sinus tachycardia
C. Sinus bradycardia
D. Junctional escape rhythm
ANS: C
Rationale: A normal sinus rate is 60–100 bpm. Rates below 60 bpm
from the SA node define sinus bradycardia.
2. An atrioventricular (AV) junctional focus takes over at 45 bpm. What is
this rhythm called?
A. Accelerated junctional rhythm
B. Junctional escape rhythm
C. Ventricular escape rhythm
D. Premature junctional contraction
ANS: B
Rationale: A junctional escape rhythm originates in the AV node at 40–
60 bpm, typically after sinus arrest or block.
3. During complete heart block, the ventricular rate is 30 bpm. From
which site does the ventricular pacemaker most likely originate?
A. SA node
B. AV node
C. His bundle
D. Purkinje fibers
ANS: D
2
, Rationale: Ventricular escape rhythms below 40 bpm arise from
Purkinje fibers.
4. Which intrinsic rate range corresponds to an accelerated
idioventricular rhythm?
A. 20–40 bpm
B. 40–60 bpm
C. 60–100 bpm
D. 100–120 bpm
ANS: D
Rationale: Accelerated idioventricular rhythms from ventricles fire at
40–100 bpm, but >100 bpm often termed ventricular tachycardia.
5. An atrial focus fires at 150 bpm independently of the SA node. Which
term applies?
A. Atrial fibrillation
B. Multifocal atrial tachycardia
C. Atrial tachycardia
D. Atrial escape rhythm
ANS: C
Rationale: A trial tachycardia is originated from a single ectopic atrial
focus firing at 150 bpm.
6. When the SA node fails and no subsidiary pacemaker takes over, what
is the expected ECG presentation?
A. Asystole
B. Sinus pause
C. Ventricular fibrillation
D. Junctional rhythm
3
Final Test Review
(Questions & Solutions)
2025
1
,1. A 68-year-old patient’s intrinsic sinoatrial (SA) node fires at 55 beats
per minute. Which description best characterizes this rate?
A. Normal sinus rate
B. Sinus tachycardia
C. Sinus bradycardia
D. Junctional escape rhythm
ANS: C
Rationale: A normal sinus rate is 60–100 bpm. Rates below 60 bpm
from the SA node define sinus bradycardia.
2. An atrioventricular (AV) junctional focus takes over at 45 bpm. What is
this rhythm called?
A. Accelerated junctional rhythm
B. Junctional escape rhythm
C. Ventricular escape rhythm
D. Premature junctional contraction
ANS: B
Rationale: A junctional escape rhythm originates in the AV node at 40–
60 bpm, typically after sinus arrest or block.
3. During complete heart block, the ventricular rate is 30 bpm. From
which site does the ventricular pacemaker most likely originate?
A. SA node
B. AV node
C. His bundle
D. Purkinje fibers
ANS: D
2
, Rationale: Ventricular escape rhythms below 40 bpm arise from
Purkinje fibers.
4. Which intrinsic rate range corresponds to an accelerated
idioventricular rhythm?
A. 20–40 bpm
B. 40–60 bpm
C. 60–100 bpm
D. 100–120 bpm
ANS: D
Rationale: Accelerated idioventricular rhythms from ventricles fire at
40–100 bpm, but >100 bpm often termed ventricular tachycardia.
5. An atrial focus fires at 150 bpm independently of the SA node. Which
term applies?
A. Atrial fibrillation
B. Multifocal atrial tachycardia
C. Atrial tachycardia
D. Atrial escape rhythm
ANS: C
Rationale: A trial tachycardia is originated from a single ectopic atrial
focus firing at 150 bpm.
6. When the SA node fails and no subsidiary pacemaker takes over, what
is the expected ECG presentation?
A. Asystole
B. Sinus pause
C. Ventricular fibrillation
D. Junctional rhythm
3
