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Junctional Rhythms in Cardiac Electrophysiology Quiz

#1

Which of the following defines a junctional rhythm?

A rhythm originating from the atrioventricular (AV) node
Explanation

AV node origin

#2

What is a common characteristic of junctional rhythms?

Irregular rhythm with no visible P wave
Explanation

Irregular, absent P wave

#3

Which condition might be associated with junctional rhythms?

Atrial fibrillation
Explanation

Associated with atrial fibrillation

#4

What is the typical heart rate range for junctional rhythms?

40-60 beats per minute
Explanation

Heart rate: 40-60 bpm

#5

Which electrolyte imbalance might predispose someone to junctional rhythms?

Hyperkalemia
Explanation

Predisposed by hyperkalemia

#6

In which clinical scenario might you encounter a junctional rhythm?

In a patient with a history of heart failure
Explanation

Common in heart failure patients

#7

What is the typical QRS complex morphology in a junctional rhythm?

Narrow QRS complex
Explanation

QRS: Narrow

#8

Which of the following is a potential complication of untreated junctional rhythms?

Heart block
Explanation

Complication: Heart block

#9

Which ECG characteristic might indicate a junctional rhythm?

Short PR interval
Explanation

Short PR interval

#10

What is the underlying mechanism of a junctional escape rhythm?

Failure of the SA node to fire
Explanation

SA node failure

#11

Which medication might be used to treat symptomatic junctional rhythms?

Atropine
Explanation

Treatment: Atropine

#12

What might be the cause of an accelerated junctional rhythm?

Excessive sympathetic stimulation
Explanation

Cause: Sympathetic stimulation

#13

Which type of AV block might be associated with junctional rhythms?

Second-degree AV block, Mobitz type II
Explanation

Associated with Mobitz II AV block

#14

Which of the following is a potential cause of junctional rhythm in the setting of acute myocardial infarction?

Ischemia or damage to the AV node
Explanation

MI complication: AV node damage

#15

Which of the following statements regarding junctional rhythms is true?

Junctional rhythms typically have a slow heart rate
Explanation

Typically slow heart rate

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