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Maria Isabel Sá1, Sofia Cabral, P Dias Costa

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Myotonic dystrophy frequently affects heart conduction, often without symptoms. Larger CTG expansions correlate with more severe neurological and cardiac issues, necessitating close monitoring for myotonic dystrophy patients.

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Area of Science:

  • Cardiology
  • Neurology
  • Genetics

Background:

  • Myotonic dystrophy is a multisystem disorder with frequent cardiac involvement, especially affecting the conduction system.
  • Cardiac symptoms in myotonic dystrophy can vary, requiring vigilant monitoring and potential pacemaker implantation.

Purpose of the Study:

  • To evaluate cardiac alterations in myotonic dystrophy patients.
  • To correlate cardiac findings with genetic (CTG expansion) and neurological data.

Main Methods:

  • Studied 46 patients with myotonic dystrophy.
  • Assessed cardiac conduction, global systolic function, and left ventricular segmental contractility.
  • Analyzed correlations between CTG repeat expansion, neurological disability, and cardiac abnormalities.

Main Results:

  • 80.4% of patients had asymptomatic cardiac conduction abnormalities.
  • Only one patient showed impaired global systolic function, but 32.6% had segmental contractility changes.
  • Left ventricular noncompaction was identified in 8 patients.
  • Greater CTG expansion correlated with more severe neurological involvement and conduction abnormalities.
  • Increased neurological disability was associated with more significant conduction tissue involvement.

Conclusions:

  • Myotonic dystrophy commonly presents with asymptomatic cardiac conduction abnormalities.
  • Genetic and neurological severity in myotonic dystrophy are linked to the extent of cardiac conduction system involvement.