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10 Cards in this Set

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  • Back
Distribution of Ions at Rest:
Nat
K
Cl
Ca
(intracellular first, extracellular 2nd)
Na: 10, 145
K: 140, 4
Cl: 4, 115
Ca: <.001, 2
So who is responsible for the Action Potential breaking the threshold?
Na INFLUX
Two types of Action Potentials?
Fast Response
Slow Response
Where do you find the different Types of Action Potentials?
Fast in working and conduction fibers

Slow in SA and AV nodes
Predominant Ion in each type of AP?
Fast = Na
Slow = Ca
What are three ways the automaticity of the SA and AV nodes can be altered?
Change in slope of phase 4 depolarization
Change in resting membrane potential (RMP)
Change in Threshold
How is the Conduction Velocity represented on the lil graphy graph?
The slope of Phase 0
When the heart beats free from the initiation of the SA node its called a ___________?
Escape Beat
What is the deal with Re-Entry Arrhythmias?
Purkinje Fibers fan out to innervate all of the ventricular muscle.
If there is ischemic tissue, the action potential can't make it through that spot.
The network of purkinje fibers can still make it to the other side of the clot, but not in the normal amount of time or sequence.
This leads to arrhythmias, coupled beats, etc
How can you treat Re-Entry Arrhythmias?
Stop Re-entry via:
Agent decreasing RP so conduction happens
Agent lengthens RP and fully blocks conduction