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Related Experiment Videos

Postural heart block

P E Seda, J H McAnulty, C J Anderson

    British Heart Journal
    |August 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

    Orthostatic heart block can cause dizziness and syncope. This condition, where heart block worsens upon standing, may be identified through ambulatory monitoring, especially if electrocardiogram abnormalities are present.

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    Area of Science:

    • Cardiology
    • Electrophysiology
    • Neurology

    Background:

    • Orthostatic symptoms like dizziness and syncope are typically attributed to intravascular volume shifts or autonomic dysfunction.
    • Identifying the precise cause of orthostatic symptoms is crucial for effective patient management.

    Observation:

    • A patient experienced recurrent orthostatic dizziness and syncope.
    • These symptoms were directly correlated with the onset of second-degree type II heart block upon assuming an upright posture.
    • Normal atrioventricular conduction and asymptomatic status were noted when the patient was supine.

    Findings:

    • Electrocardiogram revealed left bundle-branch block.
    • Intracardiac electrophysiological studies indicated the heart block originated distal to the His bundle.

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  • The findings strongly suggest orthostatic heart block as the cause of the patient's symptoms.

    • Implications:

    • Orthostatic heart block is a potential, albeit less common, cause of orthostatic neurological symptoms.
    • Ambulatory monitoring is a valuable diagnostic tool for patients presenting with orthostatic neurological symptoms, particularly those with concurrent electrocardiogram conduction abnormalities.
    • This case highlights the importance of considering cardiac causes in the differential diagnosis of orthostatic intolerance.