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Related Concept Videos

Pulmonary Edema II: Pathophysiology01:18

Pulmonary Edema II: Pathophysiology

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Pulmonary edema is the accumulation of fluid in the interstitial and alveolar spaces of the lungs, impairing gas exchange and oxygen delivery. It may be cardiogenic or noncardiogenic, but both reduce oxygenation and lung compliance.Cardiogenic Pulmonary EdemaCardiogenic edema results from increased hydrostatic pressure in pulmonary capillaries, usually due to left ventricular dysfunction from myocardial infarction, heart failure, or valvular disease. Ineffective cardiac pumping causes blood to...
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Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

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Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
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Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

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Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
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Factors Affecting Pulmonary Ventilation01:19

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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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Related Experiment Video

Updated: Apr 27, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
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Small changes in lung function in runners with marathon-induced interstitial lung edema.

Gerald S Zavorsky1, Eric N C Milne2, Federico Lavorini3

  • 1Department of Health and Sport Sciences, University of Louisville, Louisville, 40292, Kentucky Department of Physiology and Biophysics, University of Louisville, Louisville, 40292, Kentucky.

Physiological Reports
|June 29, 2014
PubMed
Summary

Mild lung edema occurs in marathon runners, but it has minimal physiological impact. Pulmonary function changes are mild and do not predict edema severity, suggesting it is not a significant concern for performance or health.

Keywords:
Enduranceexerciselung fluidlung functionpulmonarywater

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Area of Science:

  • Sports Medicine
  • Pulmonary Physiology
  • Radiology

Background:

  • Marathon running can induce physiological stress, including potential respiratory complications.
  • Pulmonary edema, fluid accumulation in the lungs, is a concern in endurance athletes.
  • Assessing lung function and radiological changes post-marathon is crucial for understanding athlete health.

Purpose of the Study:

  • To evaluate the occurrence and severity of lung edema in marathon runners.
  • To assess changes in pulmonary function following marathon completion.
  • To determine the relationship between radiological signs of edema and pulmonary function parameters.

Main Methods:

  • Posterior/anterior (PA) chest radiographs were taken before and after a marathon.
  • Radiographs were scored for interstitial edema by blinded readers.
  • Pulmonary function tests, including forced vital capacity (FVC) and diffusing capacity for carbon monoxide (DmCO), were performed pre- and post-marathon.

Main Results:

  • Mild pulmonary edema was observed in at least 17% of runners, with a significant increase in edema scores post-marathon.
  • A small but significant decrease in FVC and DmCO was noted after the marathon.
  • No significant correlation was found between the severity of lung edema and the changes in FVC or DmCO.

Conclusions:

  • Mild exercise-induced lung edema is common in marathon runners.
  • Post-marathon pulmonary function changes are mild and not predictive of edema.
  • Lung edema in this context appears to be of minimal physiological significance, not affecting performance or causing significant hypoxemia.