Premature Junctional Contractions Quiz

What is the primary origin of premature junctional contractions?

• SA node

• Bundle of His

• Purkinje fibers

• AV junction

Which of the following is a characteristic issue with P-waves in PJCs?

• Always visible before QRS

• Always inverted

• Always visible after QRS

• Can be concealed within QRS

How do PJCs differ from junctional escape beats?

• Escape beats are faster than PJCs

• PJCs occur randomly without a pause

• Escape beats occur without a pause

• PJCs have a pause before them

What is the expected PR interval for a PJC when the P-wave is visible before the QRS complex?

• Greater than 0.20 seconds

• Exactly 0.12 seconds

• Between 0.12 and 0.20 seconds

• Less than 0.12 seconds

Which of the following is a common cause of increased automaticity in the AV junction leading to PJCs?

• Hyperglycemia

• Hypertension

• Deox toxicity

• Hypothermia

Which electrolyte imbalance is NOT typically associated with PJCs?

• Magnesium

• Sodium

• Potassium

• Calcium

What is a potential consequence of frequent PJCs?

• Increased cardiac output

• Improved blood pressure

• Lower cardiac output

• Enhanced heart rhythm regularity

Which lifestyle change is recommended to help reduce the occurrence of PJCs?

• Reduce water intake

• Limit alcohol consumption

• Start smoking

• Increase caffeine intake

What should be done if a patient on dexin shows signs of PJCs?

• Notify the healthcare provider

• Ignore the PJCs

• Increase the dexin dose

• Administer more caffeine

What is the antidote for dexin toxicity?

• Lidocaine

• Atropine

• Digifab

• Amiodarone