Electrophysiology

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Where is the block if no His spike is seen?

AV node
Where is the block if no ventricular signal is seen?

Below the AV node
What is most likely explanation is V comes before His (negative H-V interval)?

Pre excitation
What is the triangle of Coch?

Triangular shape of the AV node consisting of AV nodal body, slow pathway and fast pathway
What is the term given to the switch from fast pathway to slow pathway?
How is this seen in an EP study?
- Jump
- Lengthening of the AH interval (slower conduction)
What arrhythmia cause A&His&V to line up in an EP study?

AVNRT (all being stimulated at the same time)
Why do A&His&V not line up in AVRT?

Not originated from the AV node so one thing becomes depolarised first
What are cannon waves?
- Pulsations/Poundings in the neck
- Caused by atria contracting against closed AV valves
Why is the P wave in AVNRT narrower in comparison to a sinus P wave?

Both atria are activated simultaneously
Pseudo R1 pattern may be seen in AVNRT; Why?

Atria may be activated after ventricles so tails on end of QRS complex
What is the treatment for persistent AVNRT?

Slow pathway ablation
What does an atrial "bump and spike" symbolise?

Activation of atria via the slow pathway
What is orthodromic AVRT?
- Atria - His - Ventricles - Accessory pathway - Atria
- Narrow Complex
What is antidromic AVRT?
- Atria - Accessory pathway - Ventricles - His - Atria
- Broad complex
What is pre-excited AF?

Rapid, broad complex irregular tachy
What type of arrhythmia is WPW?

AVRT
What rhythm occurs during ablation?

Accelerated junctional rhythm
What does a slow junctional rhythm represent during RF ablation?

Procedural success
Complications:

Total AV node destruction resulting in a pacemaker
What are the EP catheters used?
- CS - Coronary sinus
- HIS - His Bundle
- HRA - High right atrium
- HRV - High right ventricle

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Westy50

190754

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Electrophysiology

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Updated

2013-01-03T15:06:08Z