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Mechanisms of Tachycardia
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VT is what type of Tachycardia
Reenterant
When a cell reaches its threshold before SA node
enchanced automaticity
Reenterant Tachy makes up what percent?
80
Enchanced Automaticity can be caused by?
electrolyte imbalances
ischemia
drug toxicity
Triggered Automaticity
Catecholamine-dependent arrhythmias
Reentry is caused by?
Scars.......come on rob
3 pre-exisiting conditions for Reentry
1. two limb conduction pathway
2.unidirectional block
3. triggered event
Defibrillators were designed for ____________
tachycardias
Reentrant
Types of SVT
AF
AFL
Inta-atrial reentry tachy
SA node reentry tachy
AV nodal reentry tachy (AVNRT)
Wollf-Parkinson-White
Macro-reentry
Involves a large reentry circuit
-can encompass both atria and ventricles
mirco-reentry
involves a small reentry circuit
-within one chamber
AVNRT
AV Node Reentry Tachycardia
-reentry circuit is entirely within the AV node
3 types of AF
1.paroxysmal
-resolves without treatment, often asymptomatic
2. Persistent
-requires treatment to convert
3. Permanent
How to treat AF
drugs
cardioversion
abaltion
devices
3 types of Ventricular Tachycardia
Automatic
Triggered Automatic
Reentry
Rentry VT
ICD's were designed to treat this type of VT
What does DFT stand for?
Defibrillatory Threshold
What happen in VF
Rates so high cardiac output drops to zero
=death
Ways to treat VT's?
drugs
ablation
device
If you can enduce arrythimias in EP lab it's?
If you can terminate it with ____ its reentrant
Reentrant
PES
Author
jordan1128
ID
242379
Card Set
Mechanisms of Tachycardia
Description
Thats Tachy
Updated
2013-10-24T00:16:10Z
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