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Cardiac conduction in myotonic dystrophy.

R C Griggs, R J Davis, D C Anderson

    The American Journal of Medicine
    |July 1, 1975
    PubMed
    Summary
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    Myotonic dystrophy frequently causes cardiac conduction abnormalities, including heart block. Diphenylhydantoin may be a preferred treatment for myotonia in affected patients due to its effect on heart rhythm.

    Area of Science:

    • Cardiology
    • Neurology
    • Genetics

    Background:

    • Myotonic dystrophy is a multisystem disorder.
    • Cardiac conduction abnormalities are common in myotonic dystrophy and can lead to severe outcomes like complete heart block.
    • Early detection of cardiac involvement is crucial for patient management.

    Purpose of the Study:

    • To investigate the prevalence and patterns of cardiac conduction abnormalities in patients with myotonic dystrophy.
    • To assess the impact of specific medications on cardiac conduction in these patients.

    Main Methods:

    • Study included 26 patients diagnosed with myotonic dystrophy.
    • Electrocardiography (ECG) and His bundle electrocardiography were utilized to evaluate cardiac conduction.
    • Patients were treated with procainamide and diphenylhydantoin to observe their effects on the P-R interval.

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    Main Results:

    • First-degree heart block was observed in 7 patients before clinical symptoms manifested.
    • His bundle electrocardiography revealed widespread conduction system abnormalities, even in patients with only first-degree heart block.
    • Slowing in conduction was consistently present in remaining fascicles when other parts of the bundle branch system were affected.
    • Procainamide prolonged the P-R interval, while diphenylhydantoin shortened it.

    Conclusions:

    • Cardiac conduction abnormalities are a significant and often early feature of myotonic dystrophy.
    • Diphenylhydantoin shows potential as a beneficial therapeutic agent for managing myotonia in myotonic dystrophy patients due to its favorable effects on cardiac conduction.