Trifascicular Block
Overview
When the right bundle branch and the left bundle branch (or both left-sided fascicles) are blocked, complete heart block occurs. However, several patterns suggest 'incomplete' or 'impending' trifascicular block.
ECG Findings
- Bifascicular block (RBBB and LAFB or LPFB) with first degree AV block
- Alternating LBBB and RBBB
- Fixed RBBB with alternating LAFB and LPFB
- Complete heart block
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