Forced Expiratory Volume
Forced Expiratory Volume - Related Videos
11:31
Determination of Impingement Forces on a Flat Plate with the Control Volume Method
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2023
Source: Ricardo Mejia-Alvarez and Hussam Hikmat Jabbar, Department of Mechanical Engineering, Michigan State University, East Lansing, MI The purpose of this experiment is to demonstrate forces on bodies as the result of changes in the linear momentum of the flow around them using a control volume formulation [1, 2]. The control volume analysis focuses on the macroscopic effect of flow on engineering systems, rather than the detailed description that could be achieved with a differential...
04:01
Real Gases: Effects of Intermolecular Forces and Molecular Volume Deriving Van der Waals Equation
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2020
Thus far, the ideal gas law, PV = nRT, has been applied to a variety of different types of problems, ranging from reaction stoichiometry and empirical and molecular formula problems to determining the density and molar mass of a gas. However, the behavior of a gas is often non-ideal, meaning that the observed relationships between its pressure, volume, and temperature are not accurately described by the gas laws. According to kinetic molecular theory, particles of an ideal gas do not exhibit...
13:10
Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique
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Cited by 130 •
2013
The present protocol provides a detailed step-by-step description of the procedures required to execute measurements of respiratory system mechanics as well as the assessment of airway responsiveness to inhaled methacholine in mice using the forced oscillation technique (flexiVent; SCIREQ Inc, Montreal, Qc, Canada).
03:13
Intermolecular Forces
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2020
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
08:00
Force and Acceleration
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2023
Source: Nicholas Timmons, Asantha Cooray, PhD, Department of Physics & Astronomy, School of Physical Sciences, University of California, Irvine, CA The goal of this experiment is to understand the components of force and their relation to motion through the use of Newton's second law by measuring the acceleration of a glider being acted upon by a force. Nearly every aspect of motion in everyday life can be described using Isaac Newton's three laws of motion. They describe how objects in...
FAQs
FEV1 shows how much air leaves the lungs during the first second, whereas forced vital capacity represents the total volume expelled during the maneuver. Comparing these measurements helps clinicians assess whether airflow is limited during forced exhalation. This combined interpretation is more informative for evaluating pulmonary function than considering the first-second volume in isolation.
Airway inflammation can be associated with bronchial obstruction and respiratory impairment, which may reduce the volume expelled during forced exhalation. In immunology and infection research, changes in FEV measurements therefore provide a functional indicator of how airway disease affects breathing. The measurements help connect inflammatory or infectious processes with measurable pulmonary consequences.
FEV1 focuses on the speed of exhalation during its first second, while the total forced vital capacity reflects the complete volume exhaled during the maneuver. A person may therefore have information about both early airflow and overall expelled volume. Examining these complementary values helps characterize airflow limitation and respiratory impairment more precisely.
The individual first inhales fully to establish a maximal starting breath. They then exhale as rapidly and completely as possible while the spirometry recording captures the expelled volume over defined time intervals. This procedure produces measurements such as FEV1 and forced vital capacity, allowing the resulting pattern to be evaluated for pulmonary function.
FEV measurements provide a way to evaluate airway inflammation, bronchial obstruction, and respiratory impairment associated with asthma or pulmonary infection. Investigators can use the recorded values to characterize how these conditions affect lung function. Because the measurements can be collected over time, they also support assessment of disease progression and response to treatment.
Changes in FEV values can help track whether respiratory impairment is progressing, remaining stable, or changing during treatment. In infection and immunology studies, this longitudinal information links pulmonary function with the course of airway disease. Researchers and clinicians can compare measurements across assessments to evaluate treatment response in conditions such as asthma or pulmonary infection.