Bifascicular Block

The term bifascicular block refers to conduction blocks over two fascicles: (1) RBB and LASF, (2) RBB and LPIF, or (3) left bundle branch (LBB) block.

In LBB block, ventricular activation is by way of the RBB and proceeds from right to left and inferior to superior. The ECG characteristics of LBB block are (1) prolonged QRS duration (greater than 0.12 s); (2) large and wide R waves in leads I, aV L, V5, and V6; (3) small r wave followed by deep S wave in leads II, iIi, aVF, and V! to V3; and (4) no q waves in leads I, aVF, V5, and V6 (Fig.:..., .2.4:34.).

FIG. 24-34. Left bundle branch block (LBB block).
Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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