Ventricular tachycardia: Difference between revisions
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*Right ventricular outflow tract - right axis deviation; [[LBBB]] pattern; provoked by [[catecholamine]] release, sudden changes in heart rate, exercise; responds to alpha-blockers and calcium antagonists. | *Right ventricular outflow tract - right axis deviation; [[LBBB]] pattern; provoked by [[catecholamine]] release, sudden changes in heart rate, exercise; responds to alpha-blockers and calcium antagonists. | ||
*Polymorphic - looks like [[Torsades de pointes]] (QT interval normal in sinus rhythm); similar to [[AF]]; can lead to [[cardiogenic shock]] and [[VF]]. | *Polymorphic - looks like [[Torsades de pointes]] (QT interval normal in sinus rhythm); similar to [[AF]]; can lead to [[cardiogenic shock]] and [[VF]]. | ||
*[[Torsades de pointes]] | |||
===Risk Factors=== | ===Risk Factors=== | ||
Revision as of 17:28, 7 December 2009
Definition
This is a broad-complex tachycardia (QRS >120ms/3 small squares) which originates in the ventricles.
Epidemiology
Really common and dangerous, particularly in coronary artery disease.
Pathophysiology
There are three different types of VT:
- Fascicular - uncommon; associated with structural heart defects; from left bundle branch; short QRS complexes (0.11-0.14s); QRS complexes look like RBBB
- Right ventricular outflow tract - right axis deviation; LBBB pattern; provoked by catecholamine release, sudden changes in heart rate, exercise; responds to alpha-blockers and calcium antagonists.
- Polymorphic - looks like Torsades de pointes (QT interval normal in sinus rhythm); similar to AF; can lead to cardiogenic shock and VF.
- Torsades de pointes