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Related Concept Videos

Pulmonary Function Tests01:25

Pulmonary Function Tests

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Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
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Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

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Chronic Inflammation
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Assessing and diagnosing Chronic Obstructive Pulmonary Disease (COPD) involves a detailed approach that includes a comprehensive review of medical history, physical examination, and a variety of diagnostic tests. This thorough evaluation is essential to ensure an accurate diagnosis and guide effective management strategies.
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Chronic Obstructive Pulmonary Disease-III: Symptoms and Complications.01:25

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Chronic Obstructive Pulmonary Disease (COPD) is a long-lasting respiratory condition requiring continuous attention and care. It is a progressive lung disease that leads to breathing challenges due to airflow obstruction. It manifests as persistent respiratory symptoms and restricted airflow resulting from abnormalities in the airways and alveoli, usually due to long-term exposure to harmful particles or gases. COPD mainly consists of two primary conditions: emphysema and chronic bronchitis.
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Chronic Obstructive Pulmonary Disease01:24

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COPD is defined as a heterogeneous lung condition marked by persistent respiratory symptoms such as dyspnea, cough, and sputum production, caused by abnormalities in the airways that cause airflow obstruction.
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Related Experiment Video

Updated: Apr 16, 2026

Measurements of Motor Function and Other Clinical Outcome Parameters in Ambulant Children with Duchenne Muscular Dystrophy
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Characterization of pulmonary function in Duchenne Muscular Dystrophy.

O H Mayer1, R S Finkel, C Rummey

  • 1Division of Pulmonology, The Children's Hospital of Philadelphia, Philadelphia, USA.

Pediatric Pulmonology
|March 11, 2015
PubMed
Summary

Spirometry is feasible in Duchenne Muscular Dystrophy (DMD) patients using modified criteria. Lung function (FVC, PEF) declines with age but is unaffected by ambulation or steroid use in DMD.

Keywords:
Muscular dystrophyforced vital capacitynatural historypeak expiratory flowpulmonary function test

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Area of Science:

  • Pulmonary Medicine
  • Neuromuscular Disorders
  • Clinical Trials

Background:

  • Pulmonary function decline in Duchenne Muscular Dystrophy (DMD) significantly impacts morbidity and lifespan.
  • Standard spirometry acceptability criteria (American Thoracic Society [ATS]) may be too stringent for neuromuscular disease patients.

Purpose of the Study:

  • To assess the feasibility of obtaining acceptable spirometry in DMD patients.
  • To evaluate lung function (Forced Vital Capacity [FVC], peak expiratory flow [PEF]) changes over time in DMD.
  • To determine if ambulation status or glucocorticoid use affects lung function in DMD.

Main Methods:

  • Prospective spirometry data (FVC, PEF) collected from 60 DMD patients (age 5-24).
  • Data evaluated using modified ATS criteria suitable for neuromuscular disease.
  • Analysis of lung function changes relative to age, ambulation, and steroid treatment.

Main Results:

  • Acceptable spirometry obtained in 73% of subjects and 62% of all studies.
  • Absolute FVC and PEF increased until age 10, stabilized until 18, then declined.
  • Percent predicted FVC and PEF showed a consistent decline of ~5% per year (ages 5-24).
  • No significant differences in FVC or PEF were observed based on ambulation status or steroid treatment.

Conclusions:

  • Modified ATS criteria enable acceptable spirometry in DMD patients across a wide age range.
  • Curated spirometry data provides a reliable method for tracking lung function changes in DMD.
  • Ambulation status and steroid treatment did not appear to influence FVC or PEF trends in this cohort.