Ventricular tachycardia (abbreviated: VT) is a rapid heartbeat (tachycardia) that occurs in the ventricles (Lat. ventriculus ventricle) heart. Ventricular tachycardia is one of the so-called. periarestne arrhythmia, and is a life threatening condition that can result from ventricular fibrillation, asystole or sudden death and it requires ventricular tachycardia treatment.
Ventricular tachycardia is the morphology that is recognized by electrocardiography, can be divided into:
Monomorphic ventricular tachycardia - all heartbeat (QRS complexes) are of the same shape in each of the ECG leads.
polymorphic ventricular tachycardia - on the ECG monitor changes in the shape of the QRS beat to beat.
Ventricular tachycardia symptoms are three or more beats in a row from the ventricles, which have frequencies greater than 100 beats / min. According to the duration of VT can be divided into:
Ventricular tachycardia (non-sustained) - is the name for three or more beats of ventricular rate over 100 beats / minute, which lasts less than 30 seconds and stops spontaneously
Ventricular tachycardia (sustained) - is a ventricular tachycardia lasting longer than 30 seconds, regardless of whether some process is interrupted or stopped spontaneously.
Monomorphic ventricular tachycardia is characterized by the ventricular tachycardia ecg in the same types of beats, an increase of sending pulses with a center from the left or right ventricle or due to circular currents (reentry) within the ventricles. Usually occurs as a result of scarring in the myocardium after myocardial infarction.
Polymorphic ventricular tachycardia is usually due to abnormalities of ventricular repolarization of muscle fibers. Predisposition abnormalities are usually the ventricular tachycardia ecg manifests as QT prolongation, which may be acquired or congenital. Causes include congenital long QT syndrome, and earned mostly related to the toxic effects of drugs or electrolyte disturbances. The possible effect known antiarrhythmics (sotalol, amiodarone) on QT prolongation, but it is known that many drugs and the frequent use such as antibiotics, antihistamines may prolong the QT interval.