#1
Which of the following is a characteristic feature of junctional rhythms?
Regular R-R intervals
Inverted P waves
Prolonged PR intervals
Wide QRS complexes
#2
In which lead is an inverted P wave most commonly seen in junctional rhythms?
Lead I
Lead II
Lead III
Lead aVR
#3
What is the typical duration of the PR interval in a junctional rhythm?
Normal (0.12-0.20 seconds)
Prolonged (>0.20 seconds)
Shortened (<0.12 seconds)
Variable and unpredictable
#4
Which of the following is a common symptom associated with junctional rhythms?
Palpitations
Hypertension
Polyuria
Hyperactivity
#5
What ECG finding is characteristic of an accelerated junctional rhythm?
Regular R-R intervals
Inverted P waves
Normal PR intervals
Narrow QRS complexes
#6
What is the typical heart rate range for junctional escape rhythms?
60-100 beats per minute
40-60 beats per minute
100-150 beats per minute
Above 150 beats per minute
#7
Which electrolyte imbalance is commonly associated with junctional arrhythmias?
Hypokalemia
Hyperkalemia
Hypocalcemia
Hypernatremia
#8
Which term is used to describe an early, abnormally shaped P wave in a junctional rhythm?
Retrograde P wave
Premature P wave
Ectopic P wave
Absent P wave
#9
What is the primary cause of junctional escape rhythms?
Atrial fibrillation
Sinus node dysfunction
Ventricular tachycardia
Atrioventricular block
#10
Which term is used to describe a junctional rhythm that occurs at a faster rate than normal, but not as fast as a tachycardia?
Escape rhythm
Accelerated junctional rhythm
Premature junctional complex
Paroxysmal junctional tachycardia
#11
What is the key characteristic of accelerated junctional rhythm?
Heart rate below 40 beats per minute
Heart rate between 40-60 beats per minute
Heart rate between 60-100 beats per minute
Heart rate above 100 beats per minute
#12
In a junctional escape rhythm, where is the pacemaker located?
Atria
Atrioventricular (AV) node
Ventricles
Bundle of His
#13
Which medication class is commonly used in the management of junctional arrhythmias?
Beta-blockers
Calcium channel blockers
Antiarrhythmics
Diuretics
#14
What is the significance of a junctional escape rhythm in the absence of other rhythms?
Normal finding
Requires immediate intervention
Indicates atrial fibrillation
Associated with sinus bradycardia
#15
What is the primary mechanism of impulse formation in junctional rhythms?
Sinus node depolarization
Atrial depolarization
Ventricular depolarization
Atrioventricular (AV) node depolarization