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Related Experiment Videos

Concealed Wolff-Parkinson-White syndrome.

K Hiejima, S Satake

    Japanese Circulation Journal
    |March 1, 1978
    PubMed
    Summary

    This study found concealed accessory pathways (APs) are common in paroxysmal supraventricular tachycardia (PSVT) patients. Electrophysiologic testing is crucial for identifying these pathways and guiding potential surgical therapy.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Medical Diagnostics

    Background:

    • Paroxysmal supraventricular tachycardia (PSVT) is a common arrhythmia.
    • Accessory pathways (APs) are implicated in the pathophysiology of PSVT.
    • Concealed APs, not manifesting with pre-excitation on surface ECG, pose diagnostic challenges.

    Purpose of the Study:

    • To investigate the prevalence and characteristics of concealed accessory pathways (APs) in patients undergoing electrophysiologic studies.
    • To determine the association between concealed APs and documented paroxysmal supraventricular tachycardia (PSVT).
    • To evaluate the diagnostic utility of electrophysiologic testing in identifying concealed APs for potential therapeutic interventions.

    Main Methods:

    • Electrophysiologic study involving atrial and ventricular stimulation with extrastimuli in 69 patients.
    • Analysis of antegrade and retrograde accessory pathway (AP) conduction.
    • Identification of AP types (Kent, Mahaim, James) and their locations.

    Main Results:

    • Antegrade concealed Wolff-Parkinson-White (AC WPW) was found in 7/69 patients, with Kent-type APs being most common.
    • Retrograde concealed Wolff-Parkinson-White (RC WPW) was identified in 8/49 patients with V-A conduction, 7 of whom had documented PSVT.
    • The frequency of RC WPW in PSVT patients was 30.4%, with APs often located on the left side of the heart.

    Conclusions:

    • Concealed accessory pathways (APs) may be more prevalent than previously recognized.
    • Retrograde concealed Wolff-Parkinson-White (RC WPW) is significantly associated with PSVT and may warrant surgical consideration.
    • Comprehensive electrophysiologic evaluation is essential for accurate diagnosis and treatment planning in patients with suspected APs.

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