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Related Experiment Videos

Intracardiac electrography in endocardial cushion defects

J R Jacobsen, P C Gillette, B N Corbett

    Circulation
    |October 1, 1976
    PubMed
    Summary

    This study found that children with endocardial cushion defects often have delayed conduction from the high right atrium to the ventricles. Standard ECGs did not reliably detect these atrioventricular conduction abnormalities.

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    Area of Science:

    • Cardiology
    • Pediatric Electrophysiology

    Background:

    • Endocardial cushion defects (ECD) are congenital heart abnormalities that can affect cardiac conduction.
    • Understanding the electrophysiological consequences of ECD is crucial for patient management.

    Purpose of the Study:

    • To investigate sino-atrial impulse conduction through the atrioventricular (AV) node in pediatric patients with ECD.
    • To evaluate the accuracy of surface electrocardiography (ECG) in identifying conduction abnormalities in these patients.

    Main Methods:

    • Intracardiac electrography was performed in 21 unoperated pediatric patients (3 months to 11 years) with ECD.
    • Conduction times, including high right atrium-to-low right atrium, low right atrium-to-His bundle (LRA-H), and His bundle-to-ventricle (H-V), were measured.
    • Nine postoperative ECD patients (3 to 21 years) were also studied.

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    Main Results:

    • Prolonged high right atrium-to-low right atrium conduction was observed in 15 of 18 unoperated subjects.
    • Low right atrium-to-His bundle (LRA-H) conduction was mostly normal, but prolonged in one unoperated and two postoperative patients.
    • His bundle-to-ventricle (H-V) conduction was generally normal, though one patient had equivocally short H-V intervals, and two postoperative patients showed prolongation.
    • One postoperative patient developed complete atrioventricular block.

    Conclusions:

    • Children with endocardial cushion defects frequently exhibit prolonged intra-atrial conduction.
    • Intracardiac electrography reveals conduction abnormalities not always apparent on surface ECG.
    • Surface ECG is insufficient for accurately diagnosing AV conduction delays or their specific location in ECD patients.