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Related Experiment Videos

Intra-His bundle blocks (102 cases).

C Guimond, P Puech

    European Journal of Cardiology
    |December 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Accurate His bundle exploration is crucial for detecting intra-His bundle blocks, often missed on standard ECGs. This study highlights the prevalence and varied presentation of these blocks, emphasizing the need for advanced diagnostic methods.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Medical Diagnostics

    Background:

    • Intra-His bundle (intra-HB) blocks are frequently misdiagnosed as supra- or infrahisian blocks.
    • Routine His bundle exploration may miss concealed or paroxysmal intra-HB blocks.

    Purpose of the Study:

    • To investigate the diagnostic challenges and characteristics of intra-His bundle blocks.
    • To emphasize the necessity of advanced His bundle exploration techniques for accurate diagnosis.

    Main Methods:

    • Analysis of 102 cases with intra-HB blocks.
    • Detailed His bundle activity recording (proximal and distal ends).
    • Inclusion of dynamic tests and drug injections for concealed block detection.

    Main Results:

    Related Experiment Videos

    • 20% of cases showed no surface electrocardiogram criteria for AV block.
    • Only 4% exhibited a completely normal conduction pattern (normal PR interval and QRS).
    • Prevalence of block degrees: 35% first-degree, 23% second-degree, 42% third-degree intra-HB blocks.

    Conclusions:

    • Advanced His bundle exploration is vital for identifying intra-HB blocks, especially paroxysmal types.
    • Intra-HB blocks present diverse ECG findings, often without overt AV block criteria.
    • Isolated intra-HB blocks were common in elderly women with chronic third-degree AV block.