#1
Which of the following defines a junctional rhythm?
A rhythm originating from the sinoatrial (SA) node
A rhythm originating from the atrioventricular (AV) node
A rhythm originating from the Purkinje fibers
A rhythm originating from the bundle of His
#2
What is a common characteristic of junctional rhythms?
Regular rhythm with a normal P wave
Regular rhythm with an inverted P wave
Irregular rhythm with a normal P wave
Irregular rhythm with no visible P wave
#3
Which condition might be associated with junctional rhythms?
Atrial fibrillation
Ventricular tachycardia
Supraventricular tachycardia
Atrial flutter
#4
What is the typical heart rate range for junctional rhythms?
40-60 beats per minute
60-100 beats per minute
100-150 beats per minute
150-200 beats per minute
#5
Which electrolyte imbalance might predispose someone to junctional rhythms?
Hyperkalemia
Hypokalemia
Hypercalcemia
Hypocalcemia
#6
In which clinical scenario might you encounter a junctional rhythm?
During deep sleep
During vigorous exercise
In a patient with a history of heart failure
During fever
#7
What is the typical QRS complex morphology in a junctional rhythm?
Narrow QRS complex
Wide QRS complex
Variable QRS complex
Absent QRS complex
#8
Which of the following is a potential complication of untreated junctional rhythms?
Hypertension
Heart block
Ventricular fibrillation
Hyperthermia
#9
Which ECG characteristic might indicate a junctional rhythm?
Normal PR interval
Long PR interval
Short PR interval
Absent PR interval
#10
What is the underlying mechanism of a junctional escape rhythm?
Increased firing of the sinoatrial (SA) node
Failure of the SA node to fire
Decreased conduction through the atrioventricular (AV) node
Ectopic firing from the atria
#11
Which medication might be used to treat symptomatic junctional rhythms?
Digoxin
Amiodarone
Verapamil
Atropine
#12
What might be the cause of an accelerated junctional rhythm?
Excessive sympathetic stimulation
Increased vagal tone
Parasympathetic blockade
Beta-blocker use
#13
Which type of AV block might be associated with junctional rhythms?
First-degree AV block
Second-degree AV block, Mobitz type I (Wenckebach)
Second-degree AV block, Mobitz type II
Third-degree AV block
#14
Which of the following is a potential cause of junctional rhythm in the setting of acute myocardial infarction?
Sympathetic overdrive
Vagal stimulation
Ischemia or damage to the AV node
Increased circulating catecholamines
#15
Which of the following statements regarding junctional rhythms is true?
Junctional rhythms always have a regular rhythm
Junctional rhythms are always associated with inverted P waves
Junctional rhythms typically have a slow heart rate
Junctional rhythms are a type of supraventricular tachycardia