What does aberrant conduction mean?
Aberrant conduction occurs when the length of the cardiac cycle is changed without a compensatory change in the length of the refractory period. This is explained by the changes of the refractoriness in the His-Purkinje system related to changes in the RR interval.
What is aberrant SVT?
This usually means SVT with a bundle branch block. You will see that the morphology is quite different to the ECG above. The ECG below shows a LBBB morphology with a rapid rate. However, the QRS is not very wide at all.
What are supraventricular beats?
Supraventricular tachycardia (SVT) is a condition where your heart suddenly beats much faster than normal. It’s not usually serious, but some people may need treatment.
How can you distinguish supraventricular tachycardia from ventricular tachycardia?
During SVT, the tachycardia originates from the atria or involves the atria in the tachycardia circuit. During VT, cardiac activation originates from the ventricle and atrial activation may or may not be linked to ventricular activation.
What does Aberrancy mean?
: the quality or state of being aberrant : deviation from what is known, usual, or expected Sleep is a sophisticated behavior, just like walking and thinking, with its own set of age-related norms and plenty of room for idiosyncrasy, aberrancy and downright criminal behavior.—
Why do aberrant PACS occur?
Aberrant conduction occurs simply because the right and left bundle branches have different lengths of refractory periods. In Figure 2, the shaded area is the refractory period of the left and right bundle branches. As can be seen, one bundle branch, usually the right, has a longer refractory period than the other.
How can Aberrancy determine SVT?
This ECG is a difficult one! Although there is a broad complex tachycardia (HR > 100, QRS > 120), the appearance in V1 is more suggestive of SVT with aberrancy, given that the the complexes are not that broad (< 160 ms) and the right rabbit ear is taller than the left.
Why does supraventricular tachycardia occur?
SVT occurs when faulty electrical connections in the heart set off a series of early beats in the atria. When this happens, the heart rate becomes so fast so quickly, the heart doesn’t have enough time to fill with blood before the chambers contract.
What causes supraventricular premature beats?
Supraventricular premature beats may be associated with emotional stress, excessive intake of caffeinated drinks, or the administration of sympathomimetic agents (epinephrine, albuterol, and other sympathomimetic agents). PACs may also occur with hyperthyroidism.
What does supraventricular tachycardia look like on an ECG?
ECG features: P waves are often hidden – being embedded in the QRS complexes. Pseudo R’ wave may be seen in V1 or V2. Pseudo S waves may be seen in leads II, III or aVF. In most cases this results in a ‘typical’ SVT appearance with absent P waves and tachycardia.
Does aberrant mean abnormal?
deviating from the ordinary, usual, or normal type; exceptional; abnormal. an aberrant person, thing, group, etc.
What is the definition of aberrant ventricular conduction?
Aberrant ventricular conduction definition: It is a term applied to alterations in QRS contour of supraventricular beats resulting from impulse transmition during periods of physiologic refractoriness and/or depressed conductivity. The supraventricular electrical impulse is conducted abnormally through the ventricular conducting system.
How are aberrantly conducted beats different from premature beats?
Aberrantly conducted beats display typical bundle branch block morphology, which premature ventricular complexes do not. Aberrantly conducted beats are not followed by a full compensatory pause (discussed later), which premature ventricular beats are.
What is a QRS complex with aberrant conduction?
Aberrant ventricular conduction is a common electrocardiographic (EKG) manifestation that occurs when the supraventricular electrical impulse is conducted abnormally through the ventricular conducting system. This results in a wide QRS complex that may be confused with a ventricular ectopic beat.
Is the supraventricular extrasystole conducted with aberration?
The figure shows a supraventricular extrasystole (i.e a premature atrial complex/beat) which is conducted with aberration. The supraventricular impulse reaches the His-Purkinje system while the right bundle branch is still refractory and therefore blocks the impulse.