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Left ventricular function in myasthenia gravis.

K A Johannessen1, A Mygland, N E Gilhus

  • 1Department of Clinical Physiology, Haukeland Hospital, Bergen, Norway.

The American Journal of Cardiology
|January 1, 1992
PubMed
Summary
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Myasthenia gravis patients show impaired left ventricular diastolic function, with reduced filling rates and altered velocity patterns compared to healthy individuals. These findings highlight potential cardiac implications of this autoimmune disorder.

Area of Science:

  • Cardiology
  • Neurology
  • Autoimmune Diseases

Background:

  • Myasthenia gravis is an autoimmune disorder targeting acetylcholine receptors in skeletal muscle.
  • Cardiac involvement in myasthenia gravis is not fully understood, particularly concerning left ventricular diastolic function.

Purpose of the Study:

  • To investigate left ventricular diastolic function in patients with myasthenia gravis using echocardiography.
  • To compare diastolic parameters between myasthenia gravis patients and age- and heart rate-matched controls.

Main Methods:

  • M-mode and Doppler echocardiography were employed to assess diastolic function.
  • 25 patients with myasthenia gravis and a control group underwent echocardiographic studies.
  • Studies were conducted before and after pyridostigmine administration in most participants.

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Main Results:

  • Myasthenia gravis patients exhibited a 37% reduction in peak filling rate and a 12% decrease in early filling velocity (E).
  • Peak atrial filling velocity (A) was increased by 38% in patients, leading to a 33% lower E:A ratio.
  • No significant differences were observed in end-diastolic dimension, ejection fraction, or peak ejection rate between groups.

Conclusions:

  • Patients with myasthenia gravis demonstrate significant abnormalities in left ventricular diastolic function.
  • These diastolic dysfunctions may be a subclinical manifestation in myasthenia gravis patients.
  • Further research is warranted to explore the impact of acetylcholine-esterase inhibitors on these cardiac findings.