Diffusion Capacity
Diffusion Capacity - Related Videos
07:13
Phenotyping Mouse Pulmonary Function In Vivo with the Lung Diffusing Capacity
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Cited by 16 •
2015
We describe a means to quickly and simply measure the lung diffusing capacity in mice and show that it is sufficiently sensitive to phenotype changes in multiple common lung pathologies. This metric thus brings direct translational relevance to the mouse models, since diffusing capacity is also easily measured in humans.
03:31
Diffusion and Osmosis - Concepts
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2019
Cell Membranes and Diffusion In order to function, cells are required to move materials in and out of their cytoplasm via their cell membranes. These membranes are semipermeable, meaning that certain molecules are allowed to pass through, but not others. This movement of molecules is mediated by the phospholipid bilayer and its embedded proteins, some of which act as transport channels for molecules that otherwise would not be able to pass through the membrane, such as ions and carbohydrates.
08:18
Diffusion and Osmosis - Student Protocol
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2019
Diffusion in Agar ExpandNOTE: In this exercise, you will be given agar containing an indicator chemical called phenolphthalein. When phenolphthalein is exposed to the normal alkaline conditions in the agar, it will look pink. But when it is exposed to neutral or acidic conditions, it changes from pink to clear. You will make different size and shaped agar cubes as a model for cells to study the impact of cell size and shape on diffusion rate. To make the first set of cells, measure out and cut...
01:47
Lung Capacity
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2019
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. There are four defined lung volume measures: tidal volume, inspiratory reserve volume, expiratory reserve volume, and residual volume. Tidal volume is the amount of air inhaled and exhaled in a normal breath. Inspiratory...
08:44
Dual Test Gas Pulmonary Diffusing Capacity Measurement During Exercise in Humans Using the Single-Breath Method
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Cited by 2 •
2024
This protocol presents a method to assess pulmonary alveolar-capillary reserve measured by combined single-breath measurement of the diffusing capacity to carbon monoxide (DL,CO) and nitric oxide (DL,NO) during exercise. Assumptions and recommendations for using the technique during exercise form the foundation of this article.
FAQs
Carbon monoxide is useful because it binds rapidly to hemoglobin after inhalation. Measuring the amount remaining after a breath-hold provides a sensitive estimate of how effectively gas crosses from the alveoli into the blood. This approach makes the test informative about both the alveolar-capillary membrane and the pulmonary capillary blood volume involved in gas exchange.
A diffusion capacity result reflects two major parts of pulmonary gas transfer: the condition of the alveolar-capillary membrane and the amount of blood available in pulmonary capillaries. Considering both components helps clinicians assess whether abnormal gas exchange may relate to the lung tissue interface, the pulmonary circulation, or contributions from both areas.
The measurement supplies information about gas exchange that complements other clinical assessments. It can contribute to evaluation of interstitial lung disease, emphysema, and pulmonary vascular disorders, each of which may affect the pathway between inhaled gas and the bloodstream. It is also relevant when breathlessness remains unexplained by the initial clinical evaluation.
The patient inhales a small concentration of carbon monoxide and then holds the breath for a specified measurement period before the gas is assessed. The test compares the inhaled carbon monoxide with the amount remaining after the breath-hold. Because the gas binds rapidly to hemoglobin, this measurement provides information about transfer into pulmonary blood.
Clinicians may request diffusion capacity testing when assessing suspected or known interstitial lung disease, emphysema, or pulmonary vascular disorders. It can also be selected for unexplained breathlessness, when information about gas exchange is needed beyond other pulmonary function findings. The result helps characterize pulmonary involvement within a broader clinical evaluation.
Beyond initial evaluation, the measurement can support disease monitoring and assessment of treatment effects by providing information about gas exchange over time. Clinicians may also include it in preoperative evaluation, where understanding pulmonary function contributes to the overall assessment. Its value therefore extends from identifying abnormalities to following clinical status and planning care.