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Ventilatory parameters and maximal respiratory pressure changes with age in Duchenne muscular dystrophy patients

Jerome Gayraud1, Michele Ramonatxo, François Rivier

  • 1Inserm, ERI25, Montpellier F-34295, France.

Pediatric Pulmonology
|May 27, 2010
PubMed

Insights

Maximal inspiratory pressure (Pimax) is a better early indicator of respiratory impairment in Duchenne muscular dystrophy than ventilatory parameters. However, ventilatory parameters become better indicators of disease progression in later stages.

Area of Science:

  • Pediatrics
  • Pulmonology
  • Neuromuscular Disorders

Background:

  • Duchenne muscular dystrophy (DMD) is a progressive genetic disorder affecting muscles, including respiratory muscles.
  • Respiratory complications are a major cause of morbidity and mortality in DMD patients.
  • Longitudinal assessment of respiratory function is crucial for managing DMD.

Purpose of the Study:

  • To compare the functional interest of ventilatory parameters (Vital Capacity, Total Lung Capacity, FEV1) and Maximal Inspiratory Pressure (Pimax) in children with DMD during growth.
  • To determine the most reliable respiratory index for monitoring disease progression in DMD.

Main Methods:

  • A 7-year longitudinal study followed ten boys with DMD (mean age 9.1 to 16 years).
  • Ventilatory parameters (VC, TLC, FEV1) and Pimax were measured and expressed as percentages of predicted values.
  • Data analysis focused on changes and trends during the growth period.

Main Results:

  • Ventilatory parameters initially increased normally then declined after age 11-12.
  • Pimax showed a continuous decline from the study's start, reaching 67% of predicted by age 12.
  • After age 12, VC and FEV1 decreased faster (10.7%, 10.4% per year) than Pimax (6.9% per year).

Conclusions:

  • Pimax is a more sensitive index of early respiratory impairment in DMD than ventilatory parameters.
  • Monitoring ventilatory parameters after their decline begins is a better indicator of DMD progression.
  • In advanced stages, both Pimax and ventilatory parameters provide similar information on functional impact.

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