Junctional Rhythms Flashcards
What is retrograde conduction?
When the impulse spreads upwards from AV node to the atria
Where do impulses go when the AV node assumes pacemaking responsibility?
In the atria and ventricles
In junctional arrhythmias does the p wave precede the QRS complex consistently?
NO
Depends on whether the Atria or ventricles were depolarized first
What comes first if the ventricles are depolarized before the atria?
The QRS complex
What comes first if the atria is depolarized before the ventricles?
The P wave
What happens when the atria and ventricles depolarize simultaneously?
The P waves will be hidden within the QRS complex
How long is the PRI In junction all rhythms?
Less than .12 second
An inverted P wave originates in what two places?
AV node
Atria
What are four basic mechanisms that produce Arrhythmias in the AV junction?
Premature junctional complex
Junctional escape rhythm
Accelerated junctional rhythm
Junctional tachycardia
Premature junctional complex
Regularity
Depends on underlying rhythm
Premature junctional complex
Rate
Depends on underlying rhythm
Premature junctional complex
P Wave morphology (2)
Inverted
Falls before during or after QRS complex
Premature junctional complex
PRI
Less than .12
Only measured if precedes QRS complex
Premature junctional complex
QRS
Less than .12
Junctional escape rhythm
Regularity
Regular
