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Left ventricular dysfunction in Duchenne muscular dystrophy.

Katherine A James1, Jane Gralla2, Leslie A Ridall3

  • 1Colorado School of Public Health, University of Colorado, Aurora, CO, USA.

Cardiology in the Young
|January 23, 2020
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Summary

Left ventricle function declines over time in Duchenne muscular dystrophy patients. Respiratory support did not alter this cardiac decline in the study cohort.

Keywords:
Duchenne muscular dystrophyleft ventricular dysfunctionnon-invasive positive pressure ventilation

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Area of Science:

  • Cardiology
  • Neurology
  • Pulmonology

Background:

  • Duchenne muscular dystrophy (DMD) is a genetic disorder causing progressive muscle weakness.
  • Cardiorespiratory failure, including left ventricular dysfunction, is a common complication in DMD.
  • Understanding the progression of cardiac issues in DMD is crucial for patient management.

Purpose of the Study:

  • To analyze the progression of left ventricular dysfunction in Duchenne muscular dystrophy patients.
  • To investigate the impact of non-invasive positive pressure ventilation (NIPPV) on cardiac function decline in DMD.
  • To quantify the rate of ejection fraction decline in DMD patients.

Main Methods:

  • Retrospective analysis of DMD patients diagnosed between 1982-2011 from a surveillance database.
  • Inclusion criteria: patients with ≥2 echocardiograms or NIPPV-compliant patients with ≥1 ejection fraction.
  • Left ventricular dysfunction defined quantitatively (ejection fraction <55%) and qualitatively (mild, moderate, severe).

Main Results:

  • 41% of patients (n=403) had ≥2 ejection fraction assessments; mean age at first echo was 10.8 years.
  • Mean age at diagnosis of left ventricular dysfunction (EF <55%) was 15.2 years.
  • Ejection fraction declined at an estimated rate of 1.6% per year, unaffected by NIPPV initiation.

Conclusions:

  • Left ventricle function significantly declines over time in Duchenne muscular dystrophy patients.
  • Non-invasive positive pressure ventilation use did not alter the rate of cardiac function decline in this cohort.
  • Further research is needed to explore the relationship between respiratory support and cardiac function in DMD.