Figure 1 shows a premature atrial beat causing aberrant ventricular conduction. This is explained by the changes of the refractoriness in the His-Purkinje system related to changes in the RR interval. II” and “absence of RS patterns in precordial leads. Aberrant conduction occurs when the length of the cardiac cycle is changed without a compensatory change in the length of the refractory period. ≥50 ms at lead II” and for an algorithm with the combination of “RWPT ≥50 ms at lead First, the tracings of our previous study in which we simulated SVT at various rates of RAP in patients with preexisting IVCD 4 were analyzed, searching for morphological criteria described favoring VT, in order to evaluate the specificity of morphological ECG criteria for the differential diagnosis of wide QRS complex tachycardia at high rates in this patient population. It can be seen in a variety of disorders such as myocarditis, cardiomyopathy, ventricular fibrosis, heart failure, a high potassium level, and following a heart attack. The electrical activity in the left lateral wall is unopposed by the usual right ventricular electrical activity. This results in delayed depolarization of the left ventricle, especially the left lateral wall. The patient was also noted to have lost VA conduction at the end of the ablation and also developed new left Intraventricular Conduction Delay (IVCD). The morphology here is not typical for RBBB or LBBB. The burden of proof is on the person who claims a rhythm is SVT with aberrancy (and the evidence should be quite compelling). This suggests that QRS morphological changes during tachycardia should be interpreted more cautiously in right-BBB type tachycardias.
Patients with right-BBB had ECG changes during atrial pacing more frequently than those with other IVCD. 'Wide and fast' is the most important criterion for VT. The type of IVCD was an independent predictor of ECG changes during atrial pacing. In left bundle branch block (LBBB) the conduction in the left bundle is slow. VT is far more common than SVT with aberrancy. Tachycardia, and (2) the superior accuracy to diagnose VT was observed with “RWPT Sometimes: Intraventricular conduction delay (ivcd) refers to a condition in which electrical conduction through the heart muscle is delayed or slowed. On the ECG, V1 will show a negative complex. In patients with IVCD, (1) specificity of most VT criteria is low during RAP, suggestingĪ limited applicability of many of these criteria in case they develop supraventricular
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