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Related Experiment Videos

An unusual bundle-branch block.

Andrea T F Mauric1, Maria Pia Calabrò, Giuseppe Oreto

  • 1Department of Cardiology, Hospital of Olbia, Italy.

Journal of Electrocardiology
|January 3, 2006
PubMed
Summary
This summary is machine-generated.

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This case study highlights a diagnostic challenge where right bundle-branch block (RBBB) mimicked left bundle-branch block (LBBB) on ECG. Repositioning electrodes resolved the artifact, confirming RBBB.

Area of Science:

  • Cardiology
  • Electrocardiography
  • Medical Diagnostics

Background:

  • Bundle-branch blocks (BBBs) are critical indicators of cardiac conduction abnormalities.
  • Distinguishing between right bundle-branch block (RBBB) and left bundle-branch block (LBBB) is essential for accurate diagnosis and patient management.

Observation:

  • A patient presented with electrocardiogram (ECG) findings suggestive of LBBB in precordial leads V(5)-V(6), despite initial indicators of RBBB.
  • The QRS axis was +90 degrees, and QRS duration was 0.14 seconds, complicating the interpretation.
  • Unusual QRS morphology in inferior leads and a monophasic R wave with secondary ST-T changes in V(5)-V(6) were noted.

Findings:

  • The diagnostic dilemma was primarily attributed to an inferiorly directed QRS axis.

Related Experiment Videos

  • Repositioning precordial leads (V(4)-V(6)) two intercostal spaces superiorly corrected the QRS configuration, revealing typical RBBB morphology.
  • This suggests that electrode placement and resulting lead vector orientation can significantly influence ECG interpretation in BBB.

    • Implications:

    • This case underscores the importance of considering lead placement artifacts in ECG interpretation.
    • Understanding the impact of QRS axis deviation and lead positioning is crucial for accurate diagnosis of bundle-branch blocks.
    • Correcting for such artifacts can prevent misdiagnosis and ensure appropriate clinical decision-making.