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

242379

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Mechanisms of Tachycardia

Description

Thats Tachy

Updated

2013-10-24T00:16:10Z

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