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About the process
Conduction System
ECG Interpretation
ECG Rhythm Analysis
Sinus Rhythms
Atrial Rhythms
Ventricular Rhythms
Nodal Rhythms/Heart Blocks
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Process
- Cardiac Conduction System
To watch a video describing the relationship between the anatomy, function and conduction systems, view these two links:
https://www.youtube.com/watch?v=Lt092HZCppo
http://www.smartimagebase.com/view-item?ItemID=68385
Cardiac
Conduction System is composed of the following component
s:
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SA node
-
composed
of pacemaker cells
-
intrinsic
rate is 60-100 bpm
-
richly supplied by sympathetic and parasympathetic nervous systems
-
initiates
atrial depolarizaion (and contraction)
-
P wave
-
AV node - brief conduction delay occurs here to allow atria to contract
completely before the ventricles are stimulated to contract
-
intrinsic
rate is 40-60 bpm
-
PR interval
-
Bundle of
His
-
located
in the intraventricular septum
-
divided
into right and left branches
-
fuses
with Purkinje fibers
-
intrinsic
rate 20-40 bpm
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Purkinje
fibers
-
end of
the conduction system
-
initiates
ventricular depolarization (and contraction)
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intrinsic
rate 20- 40 bpm
-
QRS complex
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