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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.
PFTs involve using a spirometer, a...
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Respiratory Volumes01:15

Respiratory Volumes

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Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
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Respiratory Capacities01:24

Respiratory Capacities

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Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
One key metric is the Inspiratory Capacity (IC), which represents the maximum amount of air that can be inhaled with full effort. IC is calculated by summing the tidal volume and inspiratory reserve volume, typically ranging from 2.4 to 3.6 liters.
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Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

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Besides the pressure difference between the external environment and the lungs, the airflow rate and ease of pulmonary ventilation are also influenced by three other factors: surface tension of the fluid in the alveoli, compliance of the lungs, and airway resistance.
Alveolar Surface Tension
The alveolar fluid lines the luminal surface of the alveoli and exerts a force called surface tension. This force is caused by the polar water molecules in the liquid being more strongly attracted to each...
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Lung Capacity01:47

Lung Capacity

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The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures.
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Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies01:27

Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies

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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.
Medical History
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Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults
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Forced expiratory flows' contribution to lung function interpretation in schoolchildren.

Bernard Boutin1, Marc Koskas2, Houda Guillo2

  • 1APHP, Allergology Dept, Centre de l'Asthme et des Allergies, Hôpital d'Enfants Armand-Trousseau, Paris, France.

The European Respiratory Journal
|September 5, 2014
PubMed
Summary
This summary is machine-generated.

Forced expiratory flow (FEF) measurements rarely indicate lung function impairment in asthmatic children when standard spirometry is normal. Post-bronchodilator FEF changes are also uncommon in this group.

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Area of Science:

  • Pediatric Pulmonology
  • Respiratory Medicine
  • Clinical Diagnostics

Background:

  • Asthma is a common chronic respiratory disease in children.
  • Standard spirometry, including forced expiratory volume in 1 second (FEV1), is used to assess lung function.
  • Forced expiratory flow (FEF) at low lung volumes may offer a more sensitive measure of early airway obstruction in pediatric asthma.

Purpose of the Study:

  • To investigate if FEF measurements can alter the interpretation of baseline and post-bronchodilator spirometry in asthmatic schoolchildren with normal FEV1.
  • To determine the prevalence of abnormal baseline and bronchodilator-responsive FEF in this population.

Main Methods:

  • Prospective spirometry recording in healthy and asthmatic schoolchildren.
  • Defined abnormal baseline FEF (z-scores <-1.645) and FEF reversibility (increase > 2.5th percentile of healthy children's post-bronchodilator changes).
  • Assessed FEV1 reversibility (>12% increase).

Main Results:

  • Only 1.7% of children (2/116) had abnormal baseline FEF25-75% with normal spirometry.
  • Among asthmatic children without FEV1 reversibility, 11.1% (5/45) showed significant post-bronchodilator FEF25-75% changes.
  • Isolated abnormal baseline FEF or significant post-bronchodilator FEF changes were rare in asthmatic children with good spirometry.

Conclusions:

  • Abnormal baseline FEF values are uncommon in asthmatic schoolchildren with normal spirometry.
  • Significant bronchodilator-induced changes in FEF are also infrequent in this specific subgroup.
  • FEF measurements are unlikely to significantly alter spirometry interpretation in asthmatic children with normal FEV1 and vital capacity.