mayo ecg exam questions with all correct answers latest update |2026

mayo ecg exam questions with all correct answers latest update |
2026
1. Sinoatrial
Node (SA Located in RA near superior vena cava
node; Sinus
Node) Normal pacemaker of the heart because it possess the fastest inherent
rate of automaticity

Initiates a rhythmic impulse

2. Intra-atrial Path- Intrinsic rate (adult): 60-100
way
bpm

Conducts impulse from SA node through atrial musculature to AV node.

3. Atrioventricula Consists of:
r Node (AV
node) Anterior tract (Bachmann's):
through LA Middle tract
(Wenckebach's): through RA
Posterior tract (Thorel's): through
RA

Located in the floor of RA, near the tricuspid

valve Delays impulse from atria before it moves to

ventricles Allows for ventricular filling

Serves as a protective mechanism against rapid superventricular impulses

4. Junctional Tissue Located in the tissue surrounding the AV node, above the bifurcation of
the bundle of HIS

Serves as backup pacemaker

Intrinsic rate (adult): 40-60 bpm
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, mayo ecg exam questions with all correct answers latest update |
2026
5. Bundle of HIS Connects AV node to Right and Left bundle branches

6.




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