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Related Concept Videos

Lung Capacity01:47

Lung Capacity

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.
Assessment of Ventilation I: Respiratory Rate01:20

Assessment of Ventilation I: Respiratory Rate

Assessment of Ventilation
A Ventilation assessment is critical for monitoring a patient's health status. Respiration, one of the most accessible vital signs, provides insights into the function of numerous body systems and can indicate serious health issues, such as brainstem injuries from head trauma.
Critical Guidelines for Assessing Ventilation:
Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

Assessing the respiratory rate and rhythm for a complete minute is crucial for evaluating the breathing pattern. Even a minor increase in the patient's average respiratory rate, by as little as three to five breaths per minute, is an early and vital indicator of respiratory distress. Patients with a respiratory rate exceeding twenty-four breaths per minute require close monitoring to determine the physiological alterations. This careful observation is essential for prompt recognition and...
Factors Affecting Pulmonary Ventilation01:19

Factors Affecting Pulmonary Ventilation

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...
Respiratory Volumes and Capacities01:22

Respiratory Volumes and Capacities

The respiratory system is responsible for the intake of oxygen and the expulsion of carbon dioxide from the body. Respiratory volumes describe the volume of air in the lungs at different phases of the respiratory cycle. Tidal volume is the air breathed in and out during normal, quiet breathing. Inspiratory reserve volume is the air that can be forcefully inspired beyond the tidal volume. In contrast, expiratory reserve volume refers to the air that can be expelled from the lungs after a normal...
Pulmonary Function Tests01:25

Pulmonary Function Tests

Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
PFTs involve using a spirometer, a...

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Related Experiment Video

Updated: Jul 21, 2026

Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults
06:11

Employing the Forced Oscillation Technique for the Assessment of Respiratory Mechanics in Adults

Published on: February 9, 2022

Estimation of the FEV.

P D Oldham, T J Cole

    Thorax
    |September 1, 1983
    PubMed
    Summary

    A new method for measuring forced expiratory volume in one second (FEV1) involves averaging the three highest results from five attempts. This approach is more effective than the current standard for assessing lung function in various populations.

    Area of Science:

    • Pulmonary Medicine
    • Respiratory Physiology
    • Occupational Health

    Background:

    • The Medical Research Council (MRC) recommends averaging the last three of five forced expiratory volume in one second (FEV1) attempts.
    • Alternative methods include using the highest FEV1 from the last three or fewer attempts.
    • Accurate FEV1 measurement is crucial for diagnosing and monitoring respiratory conditions.

    Purpose of the Study:

    • To compare the effectiveness of nine different indices for estimating FEV1 from five attempts.
    • To identify the optimal index for FEV1 measurement in both healthy individuals and those with occupational lung disease.

    Main Methods:

    • Two studies were conducted: one with 40 healthy subjects and another with 335 men exposed to industrial dust.
    • Nine distinct FEV1 indices were derived from five forced expiratory maneuvers.

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  • Indices were compared based on their ability to reflect lung function changes.

    • Main Results:

    • Consistent, albeit small, differences were observed between the various FEV1 indices.
    • The mean of the three highest FEV1 results from five attempts emerged as the best overall index in both studies.
    • This optimal index provided FEV1 values comparable to the MRC-recommended method.

    Conclusions:

    • Averaging the three highest FEV1 results from five attempts is a superior method for estimating lung function.
    • Excluding the two lowest FEV1 results is a rational and effective procedure.
    • This improved index should be formally recognized for its accuracy and reliability.