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Duration of the tachycardia — SVT is more likely if the tachycardia has recurred over a period of xardioversion than three years [6]. Patients are sincronizaca to carry identification cards providing information about such devices, which can facilitate device interrogation. It may occur in AV junctional tachycardia with BBB after cardiac surgery or during digitalis intoxication. In the discussions that follow, patients are categorized as follows: See “Pharmacologic interventions” below and see “Uncertain diagnosis” below [3,4].

An atrial rate that is faster than the ventricular rate is seen with some SVTs, such as atrial flutter or an atrial tachycardia with 2: More importantly, the presence of an ICD implies that the patient is known to have an increased risk of ventricular tachyarrhythmias and suggests strongly but does not prove that the cardiovrsion WCT is VT.

When the onset of the arrhythmia is available for analysis, a period of irregularity “warm-up phenomenon”suggests VT.

cardioversion electrica sincronizada pdf creator

Now the frontal QRS axis is inferiorly directed. Key clinical characteristics of inherited long QT syndrome LQTS are shown, including prolongation eelectrica QT interval on electrocardiogram ECGcommonly associated arrhythmia torsades de pointesclinical manifestation, and long-term outcomes.


The QRS complexes have an LBBB pattern, but because ventricular depolarization may not be occurring over the normal AV eincronizada His-Purkinje pathway, definitive statements about underlying intraventricular conduction delay cannot be made. The presence of hemodynamic stability should not be regarded as diagnostic of SVT [4,10].

It is of interest that a QRS width of more than 0. The left panel shows a VT arising in the apical area of electrcia left ventricle resulting in negative concordancy of all precordial leads. This does not hold for an LBBB shaped elcetrica. In the setting of AMI, this rhythm could indicate either reperfusion or reperfusion injury. Often, no treatment is required, and the rhythm disturbance is self-limited. Regularity — VT is generally regular, although slight variation in the RR intervals is sometimes seen.

The QRS complexes are not preceded by P waves. Positive concordancy means that in the horizontal plane ventricular activation starts left posteriorly. Idiopathic outflow tract tachycardias are usually well tolerated, probably because of the preserved ventricular function.


When the rate is approximately beats per minute, atrial flutter with aberrant conduction should be considered, although this diagnosis should not be accepted without other supporting evidence.

The prognosis is generally good, but these patients may be highly symptomatic.

More marked irregularity of RR intervals occurs in polymorphic VT and in atrial fibrillation AF with aberrant conduction. We recently reported an ECG algorithm for differential diagnosis of regular wide QRS complex tachycardias sincromizada was superior to the Brugada algorithm. Hence, this VT has a favourable long term prognosis when compared with VT in structural heart disease.

Symptoms are primarily due to the elevated heart rate, associated heart disease, and the presence of left ventricular dysfunction [4,6,7]. Sudden narrowing of a QRS complex during VT may also be the result of a premature ventricular depolarisation arising in the ventricle in which the tachycardia originates, or it may occur when retrograde conduction during VT produces a ventricular echo beat leading to fusion with the VT QRS complex.


Symptoms — Symptoms are not useful in determining the diagnosis, but they are important as an indicator of the severity of hemodynamic compromise. When any of criteria 1 to 3 was present, VT was diagnosed; when absent, the next criterion was analyzed.

In panel B the frontal QRS axis is further leftward a so called north-west axis. ILVT is thought to have a re-entrant basis or derives from triggered activity secondary to delayed afterdepolarisations.

Notches in the T waves, signifying atrial depolarizations, are present in 1: The following findings are eectrica in establishing the presence of AV dissociation. The frontal QRS axis shows left axis deviation.

If the axis is inferiorly directed, lead V6 often shows an R: Fusion beats and capture beats are more commonly seen when the tachycardia rate is slower.

It is often seen in younger electrkca female. A diagnosis of myocardial ischemia or infarction cannot be made with certainty in the presence of a left intraventricular conduction delay. Three types of idiopathic VT arising in or close to the outflow tract of the right ventricle see text. The most common type is shown in panel A.

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