Ventricular Tachycardia

Ventricular Tachycardia - Knowledge Abstraction:...

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Knowledge Abstraction: Ventricular Tachycardia Definition: Originates below the bundle of His at a rate greater than 100 beats per minute, is a wide- complex rhythm that may be monomorphic (uniform) or polymorphic with beat-to-beat changes in the QRS configuration (Fig. 64-3). FIGURE 64-3 Ventricular tachyarrhythmias. A, Rhythm strip showing monomorphic ventricular tachycardia. B, Example of polymorphic ventricular tachycardia. C, Example of ventricular fibrillation. All tracings are from lead V 1 . Sustained VT persists for 30 seconds or longer or requires termination because of hemodynamic instability. Sustained polymorphic VT is generally unstable and often degenerates into VF Sustained monomorphic VT may be stable for long periods or, with faster rates or myocardial ischemia, may degenerate into polymorphic VT or VF Torsades de pointes (TdP), a particular form of polymorphic VT, has a characteristic morphology (“twisting around a point”) and is associated with prolongation of the QT interval on the surface ECG. TABLE 64-1 -- ELECTROCARDIOGRAPHIC CHARACTERISTICS OF VENTRICULAR TACHYCARDIA ATRIOVENTRICULAR RELATIONSHIP Atrioventricular dissociation Sinus capture beats
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This note was uploaded on 02/18/2012 for the course PAS 600 - 601 taught by Professor Garrubba during the Fall '10 term at Chatham University.

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Ventricular Tachycardia - Knowledge Abstraction:...

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