ADVANCED DYSRHYTHMIA FINAL
EXAM QUESTIONS AND ANSWERS
1. Which characteristic most accurately distinguishes Sinus Exit Block from Sinus Arrest?
A. Sinus Exit Block results in a pause that is a direct multiple of the previous P-P interval.
B. Sinus Arrest features a P-wave that occurs earlier than expected.
C. Sinus Exit Block shows a gradual lengthening of the PR interval before the pause.
D. Sinus Arrest always results in a junctional escape beat.
Answer: A
Conceptual Explanation: In Sinus Exit Block, the sinus node fires but the impulse is
blocked from reaching the atria; thus, the pause is a multiple of the underlying rhythm.
Sinus Arrest is a failure of the node to fire, resulting in a non-mathematical pause.
2. A patient’s ECG shows a shortened PR interval of less than 0.12 seconds and a slurred
upstroke of the QRS complex. What is the most likely diagnosis?
A. Lown-Ganong-Levine Syndrome
B. Wolff-Parkinson-White Syndrome
C. Left Bundle Branch Block
,D. First-degree AV Block
Answer: B
Conceptual Explanation: Wolff-Parkinson-White (WPW) syndrome is characterized by an
accessory pathway (Bundle of Kent) bypassing the AV node, leading to a short PR interval
and a Delta wave (slurred QRS upstroke).
3. In the context of Atrial Fibrillation, the Ashman Phenomenon refers to which of the
following?
A. A paradoxical slowing of the heart rate during exercise.
B. A sudden conversion of Atrial Fibrillation to Sinus Rhythm without intervention.
C. The presence of f-waves exceeding 400 beats per minute.
D. A wide QRS complex following a long R-R interval then a short R-R interval.
Answer: D
Conceptual Explanation: Ashman Phenomenon is a type of aberrant conduction typically
seen in AFib where a long R-R cycle followed by a short R-R cycle causes the second QRS to
be wide, often mimicking a PVC.
4. Which of the following ECG findings is most indicative of Brugada Syndrome?
A. U-waves in leads V4-V6.
B. Coved ST-segment elevation followed by a negative T-wave in leads V1-V3.
C. Delta waves in the precordial leads.
, D. Shortened QT interval less than 300ms.
Answer: B
Conceptual Explanation: Brugada Syndrome typically presents with a RBBB-like pattern
and persistent ST elevation in the right precordial leads (V1-V3), which is linked to sudden
cardiac death.
5. A 2nd-degree AV Block Mobitz Type II is characterized by:
A. A constant PR interval for conducted beats with intermittent dropped QRS complexes.
B. Progressive lengthening of the PR interval until a QRS is dropped.
C. A PR interval that is shorter than 0.12 seconds.
D. Complete dissociation between P waves and QRS complexes.
Answer: A
Conceptual Explanation: Mobitz Type II involves a block below the AV node (usually in
the Bundle of His or Purkinje fibers). The PR interval of conducted beats remains constant,
but some P waves fail to conduct to the ventricles.
6. Multifocal Atrial Tachycardia (MAT) is most frequently associated with which underlying
condition?
A. Acute Myocardial Infarction
B. Hyperkalemia
C. Chronic Obstructive Pulmonary Disease (COPD)
EXAM QUESTIONS AND ANSWERS
1. Which characteristic most accurately distinguishes Sinus Exit Block from Sinus Arrest?
A. Sinus Exit Block results in a pause that is a direct multiple of the previous P-P interval.
B. Sinus Arrest features a P-wave that occurs earlier than expected.
C. Sinus Exit Block shows a gradual lengthening of the PR interval before the pause.
D. Sinus Arrest always results in a junctional escape beat.
Answer: A
Conceptual Explanation: In Sinus Exit Block, the sinus node fires but the impulse is
blocked from reaching the atria; thus, the pause is a multiple of the underlying rhythm.
Sinus Arrest is a failure of the node to fire, resulting in a non-mathematical pause.
2. A patient’s ECG shows a shortened PR interval of less than 0.12 seconds and a slurred
upstroke of the QRS complex. What is the most likely diagnosis?
A. Lown-Ganong-Levine Syndrome
B. Wolff-Parkinson-White Syndrome
C. Left Bundle Branch Block
,D. First-degree AV Block
Answer: B
Conceptual Explanation: Wolff-Parkinson-White (WPW) syndrome is characterized by an
accessory pathway (Bundle of Kent) bypassing the AV node, leading to a short PR interval
and a Delta wave (slurred QRS upstroke).
3. In the context of Atrial Fibrillation, the Ashman Phenomenon refers to which of the
following?
A. A paradoxical slowing of the heart rate during exercise.
B. A sudden conversion of Atrial Fibrillation to Sinus Rhythm without intervention.
C. The presence of f-waves exceeding 400 beats per minute.
D. A wide QRS complex following a long R-R interval then a short R-R interval.
Answer: D
Conceptual Explanation: Ashman Phenomenon is a type of aberrant conduction typically
seen in AFib where a long R-R cycle followed by a short R-R cycle causes the second QRS to
be wide, often mimicking a PVC.
4. Which of the following ECG findings is most indicative of Brugada Syndrome?
A. U-waves in leads V4-V6.
B. Coved ST-segment elevation followed by a negative T-wave in leads V1-V3.
C. Delta waves in the precordial leads.
, D. Shortened QT interval less than 300ms.
Answer: B
Conceptual Explanation: Brugada Syndrome typically presents with a RBBB-like pattern
and persistent ST elevation in the right precordial leads (V1-V3), which is linked to sudden
cardiac death.
5. A 2nd-degree AV Block Mobitz Type II is characterized by:
A. A constant PR interval for conducted beats with intermittent dropped QRS complexes.
B. Progressive lengthening of the PR interval until a QRS is dropped.
C. A PR interval that is shorter than 0.12 seconds.
D. Complete dissociation between P waves and QRS complexes.
Answer: A
Conceptual Explanation: Mobitz Type II involves a block below the AV node (usually in
the Bundle of His or Purkinje fibers). The PR interval of conducted beats remains constant,
but some P waves fail to conduct to the ventricles.
6. Multifocal Atrial Tachycardia (MAT) is most frequently associated with which underlying
condition?
A. Acute Myocardial Infarction
B. Hyperkalemia
C. Chronic Obstructive Pulmonary Disease (COPD)
