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Related Concept Videos

Respiratory Volumes01:15

Respiratory Volumes

3.6K
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...
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Respiratory Volumes and Capacities I01:26

Respiratory Volumes and Capacities I

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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...
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Respiratory Volumes and Capacities01:22

Respiratory Volumes and Capacities

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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...
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Pulmonary Cycle: Exhalation01:17

Pulmonary Cycle: Exhalation

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In terms of human respiration, the act of expelling air, known as exhalation (or expiration), operates on the principle of pressure gradients. During expiration, the pressure within the lungs exceeds that of the surrounding atmosphere. Under normal conditions, quiet breathing involves passive exhalation and is free of muscular contractions. This is because the exhalation process is driven by the natural elastic recoil of the lungs and chest wall, both of which have an inherent tendency to...
5.2K
Pulmonary Ventilation: Inhalation01:24

Pulmonary Ventilation: Inhalation

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Pulmonary ventilation is a vital process that ensures the exchange of oxygen and carbon dioxide in the lungs. It refers to the movement of air into and out of the lungs, enabling the body to obtain oxygen and remove waste carbon dioxide. In this article, we will explore the intricacies of pulmonary ventilation, including its underlying principles, mechanisms, and the interplay of pressures within the respiratory system.
Boyle's law becomes particularly pertinent when examining respiratory...
10.5K
Assessment of Ventilation II: Respiratory Depth and Rhythm01:29

Assessment of Ventilation II: Respiratory Depth and Rhythm

2.9K
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:
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Related Experiment Video

Updated: Apr 15, 2026

Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship
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Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship

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[Aex - the area under the expiratory flow-volume loop].

D Stein1, K Stein2, S Ingrisch1

  • 1Fachklinik Gaißach.

Pneumologie (Stuttgart, Germany)
|April 9, 2015
PubMed
Summary
This summary is machine-generated.

Area under the expiratory flow-volume loop (Aex) is a valuable tool for diagnosing obstructive pulmonary diseases in young children when forced expiratory volume in one second (FEV1) is unreliable due to short expiration times.

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Area of Science:

  • Pulmonary physiology
  • Pediatric respiratory medicine

Context:

  • Pulmonary function tests (PFTs) are crucial for diagnosing obstructive airway diseases.
  • Preschool children often have expiratory times too short for reliable FEV1 measurements.
  • FEV1 is a standard PFT parameter but limited in very young children.

Purpose:

  • To evaluate the utility of Aex as an alternative to FEV1 in pediatric PFTs.
  • To compare the correlation between Aex and FEV1 in a large cohort.
  • To assess the responsiveness of Aex to bronchodilator or provocation challenges.

Summary:

  • A large-scale study analyzed 19,882 flow-volume loops, comparing FEV1 and Aex.
  • Aex, independent of expiration time, showed a strong correlation (r=0.99) with FEV1.
  • Both parameters demonstrated similar responsiveness to interventions, with a 20% FEV1 change correlating to a 36% Aex change.

Impact:

  • Aex offers a reliable alternative for assessing obstructive lung disease in preschool children.
  • This finding can improve diagnostic accuracy and management of pediatric respiratory conditions.
  • Wider adoption of Aex measurement could enhance PFT interpretation in pediatric settings.