The right bundle branch is a thin, cord-like continuation of the bundle of His that carries impulses down the right side of the interventricular septum. A large part of it crosses the right ventricular cavity inside the moderator band to reach the anterior papillary muscle. It then spreads into Purkinje fibres in the right ventricular wall.
| Location | Beneath the endocardium on the right side of the interventricular septum, continuing through the moderator band to the anterior papillary muscle. |
|---|---|
| Parts |
|
| Blood Supply | Septal perforators of the left anterior descending artery |
Conducts the impulse to the right ventricle so that it contracts in time with the left. Its route through the moderator band lets the anterior papillary muscle contract early and tense the tricuspid chordae before the rest of the wall.
Right bundle branch block is common, often found incidentally in healthy people, and by itself usually needs no treatment. New right bundle branch block can appear with pulmonary embolism, right ventricular strain or after septal procedures. It is part of the ECG pattern in Brugada syndrome and after repair of tetralogy of Fallot.
Delayed activation of the right ventricle, showing as a broad QRS with a characteristic pattern on the ECG. It is often benign but can reflect underlying heart or lung disease.
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