Right Bundle Branch Block
April 24th, 2019
Overview
Right bundle branch block occurs due to failure of conduction down the right bundle, resulting in slowed right ventricular depolarisation.
Look For
- Wide QRS >120ms (complete BBB) or 110-120ms (incomplete BBB)
- Added R wave in right precordial leads (R') - RSR' pattern in leads V1 or V2
- Slurred S wave in lateral leads - S wave duration > R wave duration (or >50ms) in leads I, V5 and V6
May be associated with ST depression / T wave inversion in V1 and V2
Causes of Right Bundle Branch Block
- Right ventricular hypertrophy
- Pulmonary embolism
- Rheumatic heart disease
- Ischaemia
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