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Pulmonary Cycle: Exhalation01:17

Pulmonary Cycle: Exhalation

In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...
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Chronic obstructive pulmonary disease is a common, preventable, and treatable respiratory disorder characterized by persistent symptoms and progressive airflow limitation. This limitation results from a combination of small-airway disease (obstructive bronchiolitis) and parenchymal destruction (emphysema), both driven by chronic inflammation from exposure to harmful particles or gases.The disease includes two main pathological entities: emphysema, marked by destruction of alveolar walls and...
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The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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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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Breath Collection from Children for Disease Biomarker Discovery
06:09

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Published on: February 14, 2019

Exhaled breath condensate: an overview.

Michael D Davis1, Alison Montpetit, John Hunt

  • 1Department of Adult Health and Nursing Systems, School of Nursing, Virginia Commonwealth University, Richmond, 23298-0567, USA. mdavis35@vcu.edu

Immunology and Allergy Clinics of North America
|August 11, 2012
PubMed
Summary

Exhaled breath condensate (EBC) offers a promising, non-invasive method for detecting lung disease biomarkers. This article discusses key factors in analyzing EBC composition for diagnostic potential.

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Area of Science:

  • Pulmonary Medicine
  • Biomarker Discovery
  • Analytical Chemistry

Background:

  • Exhaled breath condensate (EBC) is increasingly recognized as a valuable biological fluid.
  • EBC originates from airway lining fluid aerosols and condensation of exhaled gas.
  • It contains nonvolatile and water-soluble volatile compounds relevant to lung health.

Purpose of the Study:

  • To explore the potential of EBC as a source of lung disease biomarkers.
  • To discuss the composition and origins of EBC.
  • To highlight key considerations for EBC analysis.

Main Methods:

  • Review of existing literature on EBC composition and analysis.
  • Discussion of the physical and chemical processes contributing to EBC formation.
  • Identification of key analytical challenges and opportunities.

Main Results:

  • EBC contains diverse nonvolatile and volatile constituents.
  • Understanding EBC's contributors is crucial for accurate biomarker identification.
  • Further research is needed to standardize EBC collection and analysis.

Conclusions:

  • EBC holds significant promise for non-invasive lung disease diagnosis.
  • Standardization of methods is essential for clinical translation.
  • Continued investigation into EBC's molecular content will advance respiratory medicine.