Pre-excitation

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All of the following are responsible for Pre-excitation ECXEPT

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[A] Bundle of Kent
[B] James bundle
[C] Mahaim fibers
[D] Bachmann’s bundle

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Which is TRUE for diagnosis of intermittent pre-excitation?

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[A] Delta wave is abruptly lost
[B] Delta wave is gradually and partially lost
[C] Delta wave is abruptly and completely lost
[D] Delta wave is gradually and completely lost

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ALL are types of pre-excitation syndrome EXCEPT

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[A] Wolff–Parkinson–White syndrome
[B] Lown–Ganong–Levine syndrome
[C] Bradycardia-tachycardia syndrome
[D] Mahaim-type pre-excitation syndrome

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Which of the following is “James bundle” pre-excitation?

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[A] Wolff–Parkinson–White syndrome
[B] Lown–Ganong–Levine syndrome
[C] Bradycardia-tachycardia syndrome
[D] Mahaim-type pre-excitation syndrome

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“James bundle” pre-excitation involves connection of

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[A] Atra to-ventricular pathways
[B] Atrio to fascicular pathways
[C] AV Node to ventricular pathways
[D] Atria directly to the bundle of His

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	Types of pre-excitation syndrome	Conduction fibers	Location and Connection	PR interval	QRS interval	Delta wave
1	Wolff–Parkinson–White syndrome	Bundle of Kent	atria to ventricles	short	long	yes
2	Lown–Ganong–Levine syndrome	James bundle	atria to bundle of His	short	normal	no
3	Mahaim-type	Mahaim fibers	– Atrio-fascicular pathways – Nodo-ventricular pathways – Fasciculo-ventricular pathways	normal	long	no

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Most common sites for accessory pathways -atrio-ventricular pathways [bypassing the atrioventricular] node.

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Rarer sites include connections – Mahaim pathways or Mahaim fibres

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• Atrio-fascicular pathways
• Nodo-ventricular pathways
• Fasciculo-ventricular pathways

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These rarer accessory pathways are sometimes collectively referred to as Mahaim pathways or Mahaim fibres

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