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Ventricular late potentials in myotonic dystrophy.

M R Milner1, R J Hawley, M Jachim

  • 1Veterans Affairs Medical Center, Washington, DC.

Annals of Internal Medicine
|October 25, 1991
PubMed
Summary
This summary is machine-generated.

Signal-averaged electrocardiography revealed a high prevalence of ventricular late potentials in myotonic dystrophy patients, similar to those with inducible ventricular tachycardia. This suggests arrhythmias may contribute to sudden cardiac death in this population.

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Area of Science:

  • Cardiology
  • Electrophysiology
  • Genetics

Background:

  • Myotonic dystrophy is a multisystem disorder with potential cardiac involvement.
  • Ventricular arrhythmias and sudden cardiac death are known complications.

Purpose of the Study:

  • To determine the prevalence of ventricular late potentials (VLPs) in patients with myotonic dystrophy using signal-averaged electrocardiography (SAECG).
  • To assess the association of VLPs with cardiac parameters and compare findings to control groups.

Main Methods:

  • Cross-sectional study with blinded analysis of electrocardiographic data.
  • SAECG was performed on 24 patients with myotonic dystrophy, 44 healthy controls, and 30 patients with inducible ventricular tachycardia.
  • Exclusion criteria included history of significant ventricular arrhythmias or bundle-branch block.

Main Results:

  • 75% of myotonic dystrophy patients met at least one criterion for VLPs.
  • Spectrotemporal mapping showed markedly abnormal spectral peaks, approaching the frequency seen in patients with known ventricular tachycardia.
  • VLP presence correlated with longer PR interval and reduced left ventricular fractional shortening.

Conclusions:

  • The prevalence of VLPs in myotonic dystrophy patients is high, similar to those with inducible ventricular tachycardia.
  • Ventricular arrhythmias may contribute to sudden cardiac death in some myotonic dystrophy patients.
  • SAECG is a valuable tool for risk stratification in myotonic dystrophy.