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Mayo ECG course Questions and answers rated A+ 2024/2025
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Mayo ECG course Questions and answers rated A+ 2024/2025
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Mayo ECG coursecardiac conduction system
SA Node
Intra-Atrial Pathways
AV Node
Bundle of HIS
Bundle Branches
Purkinje Fibers
Sinoatrial Node (SA Node)
Normal pacemaker of heart
Initiates an impulse
Intrinsic rate of 60 - 100 BPM
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Intra-Atrial and Nodal Pathways
Located in atrial tissue between SA and AV nodes
Conducts impulse from SA node - atrial musculature - AV node
Anterior, middle and posterior tracts
Atrioventricular Node (AV Node)
, Delays impulse from atria
Allows for ventricular filling
Protective mechanism against rapid supraventricular impulses
Junctional Tissue
Tissue in lower AV node
Back up pacemaker
Intrinsic rate of 40 - 60 BPM
Bundle of His and Right/Left Bundle Branches
Bundle of His connects AV node to right and left bundle branches
Right bundle carries impulse to right ventricle; left bundle carries impulse to left ventricle
Ventricular Tissue
Back up pacemaker
Intrinsic rate of 20 - 40 BPM
Purkinje System
Distal to the bundle branches
Rapidly conducts impulses to ventricular sub-endocardial layers
Normal PR Interval measurement
0.12 – 0.20 seconds
Normal QRS Complex measurement
0.04 - < 0.12 seconds
Normal QT Interval measurement
< 0.44 seconds
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