AVNRT Flashcards
Is EP first line treatment - YES/NO
Yes - EPs with possible ablation is 1st line treatment for AVNRT
Ablate slow or fast pathway, why?
Slow - Fast is too close to the AVN and it allows the fast to naturally decrement with age with a higher starting point
What percentage of SVT is AVNRT?
60% - Its the most common SVT
Female / Male dominance?
FEMALE with approx 75% of share
Are hearts structurally normal or diseased
Frequently hearts are structurally normal in absence of disease
What rates are normal for this arrhythmia
Young adults = 150 - 200bpm
Adults = 180 - 200bpm
What are cannon waves
When Atria contract against closed AV valves - Causes pressure buildup downwind - Pulsating jugular veins
Is this arrhythmia well tolerated?
Yes - Symptoms are well managed generally. Sudden onset/offset
How to terminate without drugs
Vagal maneuvers or Carotid massage to increase refractory period/reduce conduction velocities
Define AH Jump
A jump of 50ms or more as a result of a 10ms stim decrement
What does an AH Jump signify
Dual nodal physiology - Fast pathway blocked, therefore slow pathway transports signal through AVN
What is an echo beat?
Effectively 1 cycle of Tachy that terminates
During ablation there is Fast junctional rhythm - What should you do?
Anything <350ms means fast pathway is being damaged - Stop immediately
During ablation there is slow junctional rhythm - What should you do?
Anything >350ms means slow pathway is being ablated - this is good, keep ablating.
If you see AV block - what should you do?
Stop immediately - Block persists in 1% of cases - Requires PPM insertion
