SA node - Answers -✔✔ • Normal pacemaker of heart
• Initiates an impulse
• Intrinsic rate of 60-100 BPM
Intra-Atrial & Nodal Pathways - Answers -✔✔ Located in atrial tissue between SA and
AV nodes
• Conducts impulse from SA node - Atrial musculature - AV node
• Anterior, middle and posterior tracts
Atrioventricular (AV) Node - Answers -✔✔ Delays impulse from atria
• Allows for ventricular filling
• Protective mechanism against rapid supraventricular impulses
Junctional Tissue - Answers -✔✔ Tissue in lower AV node
• Back-up pacemaker
• Intrinsic rate of 40-60 BPM
Bundle of HIS/Bundle Branches - Answers -✔✔ 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 - Answers -✔✔ Back up pacemaker
• Intrinsic rate 20-40 BPM
Purkinje system - Answers -✔✔ Distal to the bundle branches
• Rapidly conducts impulses to ventricular sub-endocardial layers
First degree block - Answers -✔✔ prolonged PR interval
"If the R if far from the P then you have first degree"
second degree type 1 blcok - Answers -✔✔ longer PR until beat is dropped
second degree type 2 - Answers -✔✔ constant PR interval
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