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Related Experiment Videos

Anaesthesia in first degree atrioventricular block

R Hayward, N Domanic, G E Enderby

    Anaesthesia
    |December 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

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    A long-standing, asymptomatic first-degree atrioventricular block worsened during general anesthesia, revealing a vagal cause for complete heart block. This case highlights the importance of evaluating conduction defects before anesthesia.

    Area of Science:

    • Cardiology
    • Electrophysiology
    • Anesthesiology

    Background:

    • First-degree atrioventricular block (AVB) is typically benign, characterized by prolonged AV nodal conduction.
    • This case involves a patient with a 32-year history of asymptomatic first-degree AVB, occasionally progressing to transient Wenckebach block.

    Observation:

    • Profound bradycardia and complete atrioventricular block developed abruptly during general anesthesia.
    • Investigations revealed delayed intracardiac conduction specifically through the atrioventricular node.

    Findings:

    • Excessive vagal activity, rather than structural heart disease, was identified as the cause of the acute atrioventricular block.
    • The patient's prolonged first-degree AVB was attributed to increased atrioventricular nodal refractoriness and slowed transmission.

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    Implications:

    • This case underscores the potential for previously asymptomatic conduction defects to decompensate under anesthetic stress.
    • It emphasizes the need for careful pre-anesthetic evaluation of patients with any degree of AVB.
    • Recommendations for temporary pacing in patients with AVB undergoing elective general anesthesia are discussed.