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.

What are two examples of aberrant conduction?

1) Atrial fibrillation( AF): Figure 2; 2) Atrial tachycardia; 3) Premature Atrial Contractions. In this case aberration occurs when a short cycle follows a long one.

What is SVT with aberrant conduction?

Any tachycardic rhythm with a left or right bundle branch block that is NOT ventricular tachycardia is considered “supraventricular tachycardia with aberrancy”.