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Isolated bundle branch block and left ventricular dysfunction.

Seung-Joon Lee1, Charles McCulloch, Iqwal Mangat

  • 1University of California, San Francisco, USA.

Journal of Cardiac Failure
|May 17, 2003
PubMed
Summary
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Left bundle branch block (BBB) can independently cause ventricular dysfunction, even without other heart disease. This finding highlights BBB as a potential risk factor for worsening cardiac health over time.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Cardiac Imaging

Background:

  • Bundle branch block (BBB) is a known mortality risk factor in cardiac patients.
  • The impact of chronic ventricular dyssynchrony from conduction delay alone on ventricular function remains unclear.

Purpose of the Study:

  • To investigate the effect of isolated bundle branch block on left ventricular function over time.
  • To determine if left bundle branch block itself can lead to ventricular dysfunction.

Main Methods:

  • Retrospective analysis of electrocardiogram database for subjects with QRS prolongation.
  • Inclusion of subjects with no evidence of heart disease and serial cardiac evaluations.
  • Longitudinal follow-up assessing left ventricular ejection fraction over a mean of 52 months.

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Main Results:

  • Isolated left bundle branch block (LBBB) cohort showed a significant annual decline in left ventricular ejection fraction (-7.3%).
  • Isolated right bundle branch block (RBBB) and non-specific intraventricular conduction delay cohorts demonstrated smaller reductions in ejection fraction (-1.9% and -1.1% respectively).
  • The difference in ejection fraction decline between LBBB and other cohorts was statistically significant (P = .019).

Conclusions:

  • Left bundle branch block may be an independent cause of ventricular dysfunction.
  • Chronic dyssynchrony from LBBB can negatively impact left ventricular function.
  • Findings suggest LBBB warrants closer monitoring for cardiac health progression.