Ventricular tachycardia can be classified in a variety of ways.

[2][3], Ventricular tachycardia can occur due to coronary heart disease, aortic stenosis, cardiomyopathy, electrolyte problems (e.g., low blood levels of magnesium or potassium), inherited channelopathies (e.g., long-QT syndrome), catecholaminergic polymorphic ventricular tachycardia, arrhythmogenic right ventricular dysplasia, or a myocardial infarction.[2][3].

Ventricular tachycardia (V-tach or VT) is a type of regular, fast heart rate that arises from improper electrical activity in the ventricles of the heart. Therapy may be directed either at terminating an episode of the abnormal heart rhythm or at reducing the risk of another VT episode. How does a single focus have a multiple… [5] Biphasic defibrillation may be better than monophasic. In monomorphic ventricular tachycardia all QRS complexes display the same morphology (minor differences are allowed). Reentry with continually changing reentrant paths, spiral wave reentry and multiple automatic foci are potential mechanisms . If this fails after a short trial, the ICD will usually stop pacing, charge up and deliver a defibrillation grade shock.

Advances in technology and understanding of VT substrates now allow ablation of multiple and unstable VTs with acceptable safety and efficacy, even in patients with advanced heart disease.[18]. Problems with blood levels of potassium, magnesium and calcium may also contribute. The ECG will demonstrate a wide-complex tachycardia… An implantable ICD is more effective than drug therapy for prevention of sudden cardiac death due to VT and VF, but may be constrained by cost issues, as well as patient co-morbidities and patient preference. Kasper, D. (2012). In structural heart disease (coronary heart disease, heart failure, cardiomyopathy, valvular disease etc) monomorphic ventricular tachycardia is typically caused by re-entry. Monomorphic ventricular ectopics are premature ventricular beats having the same morphology or shape .Monomorphic ventricular ectopics originate from a single focus within the ventricle and can be targeted for radiofrequency catheter ablation after mapping their origin using multiple catheters within the heart to record the electrical activity within the heart. Polymorphic VT is easily diagnosed after exclusion of lead motion artifact.

This scar cannot conduct electrical activity, so there is a potential circuit around the scar that results in the tachycardia. This page was last edited on 14 October 2020, at 19:02. In particular, supraventricular tachycardias with aberrant conduction from a pre-existing bundle branch block are commonly misdiagnosed as ventricular tachycardia. As a low magnesium level in the blood is a common cause of VT, magnesium sulfate can be given for torsades de pointes or if a low blood magnesium level is found/suspected.

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