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Related Concept Videos

Respiratory Volumes01:15

Respiratory Volumes

Respiratory volumes are crucial metrics, meticulously measured to quantify the air exchanged in and out of the lungs during various phases of the breathing cycle. These precise measurements are vital for assessing lung function, diagnosing respiratory conditions, and monitoring overall respiratory health. Each parameter provides specific insights into the mechanics of breathing and the functional capacity of the lungs.
Tidal Volume (TV) Tidal volume (TV) is the air inhaled or exhaled in a...
Respiratory Capacities01:24

Respiratory Capacities

Respiratory capacities are crucial indicators of lung function, representing the maximum amount of air an individual's respiratory system can handle during various breathing phases.
One key metric is the Inspiratory Capacity (IC), which represents the maximum amount of air that can be inhaled with full effort. IC is calculated by summing the tidal volume and inspiratory reserve volume, typically ranging from 2.4 to 3.6 liters.
The Functional Residual Capacity (FRC) represents the air in the...
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...
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...
Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
Respiratory Assessment: Purpose and Indications01:19

Respiratory Assessment: Purpose and Indications

Respiratory assessment is a cornerstone of nursing assessments, crucial for the early detection of patient deterioration. This evaluation transcends routine procedures, representing a critical skill nurses must master to ensure optimal patient care.
Objectives and Importance:
The primary goal of respiratory assessment is to evaluate patients at early risk of clinical deterioration. Since respiratory distress often precedes other signs of declining health, breathing patterns and sounds become a...

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Related Experiment Video

Updated: Jul 17, 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

Respiratory function in healthy young children using forced oscillations.

Graham L Hall1, Peter D Sly, Takayoshi Fukushima

  • 1Respiratory Medicine, Princess Margaret Hospital for Children, and School of Paediatric and Child Health, University of Western Australia, Perth, 6840 Australia. graham.hall@health.wa.gov.au

Thorax
|January 26, 2007
PubMed
Summary

This study establishes reference ranges for respiratory function in healthy children aged two to seven years using the forced oscillation technique. The findings demonstrate good repeatability, aiding in the diagnosis and management of pediatric respiratory conditions.

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Last Updated: Jul 17, 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

Conducting Respiratory Oscillometry in an Outpatient Setting
14:49

Conducting Respiratory Oscillometry in an Outpatient Setting

Published on: April 8, 2022

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique
13:10

Evaluation of Respiratory System Mechanics in Mice using the Forced Oscillation Technique

Published on: May 15, 2013

Area of Science:

  • Pediatric Pulmonology
  • Respiratory Physiology

Background:

  • Monitoring respiratory function is crucial for diagnosing and managing respiratory diseases.
  • The forced oscillation technique (FOT) is ideal for assessing lung function in young children due to minimal cooperation requirements.

Purpose of the Study:

  • To develop reference ranges for respiratory impedance variables in healthy children.
  • To document the short-term repeatability of FOT measurements in this pediatric population.

Main Methods:

  • FOT with a pseudo-random noise signal (4–48 Hz) was used to measure respiratory function in healthy children.
  • Respiratory resistance (Rrs) and reactance (Xrs) were assessed at 6, 8, and 10 Hz.
  • Repeatability was evaluated over a 15-minute period, and regression equations/Z-scores were determined.

Main Results:

  • Data were collected from 158 healthy children (2–7 years old).
  • Respiratory mechanics showed linear relationships with height.
  • Within-test variability was 6–9% for resistance and 17–20% for reactance; no significant changes were observed over 15 minutes.

Conclusions:

  • Reference ranges for respiratory impedance variables in healthy children (2–7 years) are provided.
  • The study reports the short-term repeatability of FOT variables in this age group.
  • These data enable the definition of appropriate cut-off values for therapeutic interventions.