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Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells
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Modeling Myotonic Dystrophy 1 in C2C12 Myoblast Cells

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Cardiac manifestations of myotonic dystrophy type 1

Helle Petri1, John Vissing, Nanna Witting

  • 1Department of Cardiology, National University Hospital Rigshospitalet, Copenhagen, Denmark. Hellepetri1@gmail.com

International Journal of Cardiology
|September 16, 2011
PubMed

Insights

Myotonic dystrophy type 1 (MD1) patients experience significant cardiac issues, including arrhythmias and heart failure. Early screening is crucial for managing cardiac risks and preventing sudden cardiac death (SCD) in these individuals.

Area of Science:

  • Cardiology
  • Neurology
  • Genetics

Background:

  • Myotonic dystrophy type 1 (MD1) is a multisystem disorder with significant cardiac implications.
  • Cardiac involvement in MD1 can lead to serious complications, including arrhythmias and heart failure.

Purpose of the Study:

  • To assess cardiac involvement in MD1 patients, focusing on ejection fraction, conduction abnormalities, arrhythmia, and sudden cardiac death (SCD) risk.
  • To explore associations between cardiac issues and CTG-repeat length, neuromuscular disease severity, age, and gender in MD1.

Main Methods:

  • A systematic literature review of studies published between 1980 and 2010 was conducted.
  • Included studies focused on cardiac parameters like LVEF, conduction abnormalities, and arrhythmia in MD1 patients, excluding those with ascertainment bias.
  • Data from 18 studies involving 1828 MD1 patients were analyzed.

Main Results:

  • High prevalence of cardiac abnormalities: AVB grade 1 (28.2%), QTc>440 ms (22%), QRS>120 ms (19.9%), frequent VPCs (14.6%), AF/AFL (5%), RBBB/LBBB (4.4%/5.7%), NSVT (4.1%), and LVSD (7.2%).
  • Positive associations found between CTG-repeat size and cardiac involvement, and between neuromuscular and cardiac disease severity.
  • Male gender and older age correlated with increased arrhythmia and conduction abnormalities. Annual SCD risk was 0.56%.

Conclusions:

  • MD1 patients exhibit substantial cardiac morbidity and mortality.
  • Pre-symptomatic screening for arrhythmias and heart failure is essential in MD1 patients.
  • Available preventive strategies can effectively manage cardiac risks in this population.
Abstract

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