Extravascular Lung Water
Extravascular Lung Water - Related Videos
01:12
Two-Compartment Open Model: Extravascular Administration
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2025
The two-compartment model for extravascular administration represents a drug's absorption and distribution process. It features a central compartment, where the drug is first absorbed, and a peripheral compartment, which illustrates the drug's distribution throughout the body. The rate of change in drug concentration in the central compartment is calculated by three exponents: absorption, distribution, and elimination. The absorption exponent (ka) indicates the speed at which the drug is...
01:15
One-Compartment Open Model for Extravascular Administration: First-Order Absorption Model
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2025
The first-order absorption model for extravascular administration describes the rate at which a drug is absorbed and eliminated, following the principles of first-order kinetics. This model is vital as it provides a mathematical representation of drug behavior within the body. It also allows for the prediction and interpretation of drug absorption and elimination based on the rate of change in drug concentration over time. This model can be visualized as a plasma concentration-time profile...
01:15
Non-Oral Extravascular Drug Absorption Routes
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2024
Non-oral extravascular routes, which encompass sublingual, buccal, topical, intramuscular, and inhalation methods, primarily utilize passive diffusion to transport drugs into the systemic circulation. The absorption rates and effectiveness of these routes depend on the drug's physicochemical properties, as well as the patient's anatomical and pathophysiological state. Lipophilic drugs that are stable at salivary pH (6) and exhibit minimal binding to the oral mucosa are absorbed more effectively...
05:35
Lung Instillation and Fixation: Introducing Liquid into the Trachea and Fixing Lungs to Measure the Fixed Lung Volume
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2023
This video describes a simple and reliable method of introducing liquid into the trachea for lung instillation, fixation, and lung volume measurement.
07:06
A Simple Method of Mouse Lung Intubation
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Cited by 50 •
2013
This paper describes a striaghforward and efficient method of intubating mice for pulmonary function measurements or pulmonary instillation, that allows the mice to recover and be studied at later times. The procedure involves an inexpensive fiberoptic light source that directly illuminates the trachea.
FAQs
An increase can result from either elevated hydrostatic pressure or inflammation. Higher hydrostatic pressure pushes fluid across pulmonary capillaries, whereas inflammatory injury increases vascular permeability, allowing more fluid to leave the vascular space. These mechanisms have different biological triggers, but both enlarge the extravascular fluid burden and can contribute to pulmonary edema in critically ill patients.
Fluid accumulation in the interstitial tissue and alveoli changes the lung environment needed for effective gas exchange and makes the lungs less compliant, meaning they are harder to expand. Consequently, a rising measurement can indicate that pulmonary fluid is beginning to interfere with respiratory function, even when the underlying cause is hydrostatic pressure or increased permeability.
EVLW provides a quantitative estimate of pulmonary fluid burden rather than relying only on the presence of respiratory failure. An elevated value supports pulmonary edema as a contributor, while its use alongside the clinical picture can help separate fluid accumulation from other explanations for impaired breathing. This distinction is useful when assessing disease severity and selecting management priorities.
The technique tracks the dilution of an indicator as it passes through the heart and lungs. The pattern of indicator dilution is then used to estimate fluid outside the pulmonary blood vessels. This approach links a measurable signal from cardiopulmonary transit with the lung’s extravascular fluid burden, allowing clinicians to monitor a physiologic quantity during critical illness.
It is useful when clinicians need to distinguish pulmonary edema from other causes of respiratory failure, judge disease severity, or guide fluid management. Repeated measurements can also show whether the pulmonary fluid burden changes after treatment. In this way, EVLW supports both initial assessment and ongoing evaluation of critically ill patients rather than serving as a one-time observation.
Changes over time can indicate whether the pulmonary fluid burden is improving, worsening, or remaining elevated during treatment. Clinicians can use that information to monitor responses and guide fluid management while also tracking respiratory illness. The value is therefore not limited to diagnosis; it can provide a biologically relevant trend in the patient’s lung-fluid status.