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[Capillary density and respiratory function in the external intercostal muscle].

M A Jiménez-Fuentes1, J Gea, M C Aguar

  • 1Servicio de Neumología, Hospital del Mar-IMIM, Barcelona.

Archivos De Bronconeumologia
|January 5, 2000
PubMed
Summary

In chronic obstructive pulmonary disease (COPD), respiratory muscle capillary density increases proportionally with disease severity. This structural change in external intercostal muscles likely represents an adaptive response to airflow obstruction.

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Area of Science:

  • Respiratory Medicine
  • Muscle Physiology
  • Pulmonary Disease Research

Context:

  • Lung function changes are linked to adaptive structural modifications in respiratory muscles.
  • Chronic obstructive pulmonary disease (COPD) affects respiratory muscle function.
  • Understanding these adaptations is crucial for managing COPD.

Purpose:

  • To evaluate capillary density (Dcap) in the external intercostal muscle of COPD patients.
  • To determine the relationship between Dcap and respiratory function in COPD.
  • To investigate structural remodeling in respiratory muscles of COPD patients.

Summary:

  • A study analyzed external intercostal muscle biopsies from 42 individuals (10 healthy, 32 COPD patients).
  • Capillary density was significantly higher in severe COPD patients and inversely correlated with FEV1 (forced expiratory volume in 1 second).

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  • Muscle capillarity was unrelated to other functional variables, suggesting a specific adaptation to airflow obstruction.

    • Impact:

    • Reveals increased interfibrillary capillary density in external intercostal muscles of COPD patients.
    • Demonstrates that this increase is proportional to the severity of airflow obstruction.
    • Suggests capillary proliferation is an adaptive phenomenon in response to COPD-related respiratory muscle stress.