Left bifascicular block with normally conducting middle fascicle

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Updated: Sep 2, 2026

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
09:17

High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation

Published on: July 29, 2011

P Alboni, C Malacarne, G Baggioni

    Journal of Electrocardiology
    |January 1, 1977
    PubMed

    Insights

    A case study reveals left ventricular hypertrophy progression in aortic insufficiency. Over one year, ECG showed a new left bifascicular block, suggesting specific fascicle involvement in septal activation.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Cardiac Imaging

    Background:

    • Aortic insufficiency can lead to left ventricular hypertrophy (LVH) and strain.
    • Electrocardiography (ECG) and Vectorcardiography (VCG) are crucial for assessing cardiac electrical activity.

    Observation:

    • A patient with aortic insufficiency initially presented with ECG findings of LVH and strain.
    • Follow-up ECG and VCG recordings after one year demonstrated the development of a left bifascicular block.

    Findings:

    • The left bifascicular block involved the anterior and posterior fascicles.
    • Septal activation remained normal, suggesting the middle fascicle's role in activating the inferior septum.

    Implications:

    • This case suggests a specific pattern of fascicular involvement in aortic insufficiency.
    • The findings prompt further investigation into the electrophysiological mechanisms of septal activation in cardiac disease.

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