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Trifascicular Block



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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