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Intraventricular Conduction: Difference between revisions
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→Fixed Bundle Branch Block
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This is the most common mechanism for sustained aberrancy during tachycardia. The sequence of QRS widening that is often observed is phase 3 aberration in the first premature beat. This can leave the left bundle (for example) refractory for the next complex. This next beat is conducted by the right bundle and once it reaches the apex, it is conducted retrograde by the left bundle. This can continue until a new premature ventricular complex causes a compensatory pause and 'resets' the system. | This is the most common mechanism for sustained aberrancy during tachycardia. The sequence of QRS widening that is often observed is phase 3 aberration in the first premature beat. This can leave the left bundle (for example) refractory for the next complex. This next beat is conducted by the right bundle and once it reaches the apex, it is conducted retrograde by the left bundle. This can continue until a new premature ventricular complex causes a compensatory pause and 'resets' the system. | ||
===Fixed Bundle Branch Block=== | ===Fixed Bundle Branch Block=== | ||
[[File:Fixed_LBBB.svg|thumb|LBBB due to fixed bundle branch block | [[File:Fixed_LBBB.svg|thumb|LBBB due to fixed bundle branch block]] | ||
Complete or marked conduction delay in a bundle branch leading to complete ventricular activation over the contralateral bundle branch. | Complete or marked conduction delay in a bundle branch leading to complete ventricular activation over the contralateral bundle branch. | ||
{{clr}} | {{clr}} | ||