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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...
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.
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 Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
Endoscopic Studies II: Thoracocentesis01:26

Endoscopic Studies II: Thoracocentesis

Thoracentesis(Thoracocentesis), commonly known as pleural tap, is a medical procedure where a 22 gauge needle is inserted into the pleural space, the area between the lung and chest wall. This procedure is commonly performed to diagnose or treat various respiratory disorders.
Description
Excess pleural fluid or air may accumulate in some respiratory disorders in the thoracic cavity. To treat pleural effusion, a physician conducts thoracentesis by carefully piercing the chest wall and entering...
Endoscopic Studies I: Bronchoscopy and Thoracoscopy01:30

Endoscopic Studies I: Bronchoscopy and Thoracoscopy

Endoscopy is a non-surgical medical technique used to examine a person's internal organs and vessels. This lesson will focus on two types of endoscopic studies: bronchoscopy and thoracoscopy.
Bronchoscopy
Description
Bronchoscopy is a procedure that involves direct visualization of the larynx, trachea, and bronchi for diagnostic and therapeutic purposes. A flexible fiber optic or rigid bronchoscope is used to carry out the procedure. The fiber-optic bronchoscope is more frequently used due to...

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Related Experiment Video

Updated: May 14, 2026

Measurement of the Pressure-volume Curve in Mouse Lungs
09:49

Measurement of the Pressure-volume Curve in Mouse Lungs

Published on: January 27, 2015

Measuring end expiratory lung volume after cardiac surgery.

G Michiels1, V Marchal, D Ledoux

  • 1Department of General Intensive Care, University Hospital Centre of Liege, Domaine universitaire du Sart-Tilman, 4000 Liege, Belgium. gregoire_michiels@msn.com

Acta Anaesthesiologica Belgica
|February 13, 2013
PubMed
Summary

End expiratory volume (EELV) is significantly reduced post-cardiac surgery. Measuring EELV offers new insights during mechanical ventilation, but recruitment maneuvers do not improve it.

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Last Updated: May 14, 2026

Measurement of the Pressure-volume Curve in Mouse Lungs
09:49

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Published on: January 27, 2015

Combining Volumetric Capnography And Barometric Plethysmography To Measure The Lung Structure-function Relationship
08:25

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

Published on: January 8, 2019

Area of Science:

  • Critical Care Medicine
  • Respiratory Physiology
  • Surgical Outcomes

Background:

  • End expiratory volume (EELV) is a key respiratory parameter.
  • Post-cardiac surgery patients often experience altered lung volumes.
  • The clinical utility of EELV measurement in this population requires investigation.

Purpose of the Study:

  • To evaluate the clinical interest and utility of measuring end expiratory volume (EELV) after cardiac surgery.
  • To assess the relationship between EELV and other physiological parameters.

Main Methods:

  • EELV was measured using nitrogen washout technique at hourly intervals for three hours post-stabilization.
  • EELV was compared to predicted functional residual capacity (FRC).
  • Relationships with respiratory system compliance, PaO2/FiO2 ratio, and BMI were analyzed. Recruitment maneuvers (RM) were performed in half the patients.

Main Results:

  • Measured EELV was 52% of predicted values and remained stable.
  • EELV showed strong correlations with PaO2/FiO2 ratio (r2=0.40) and respiratory compliance (r2=0.525).
  • EELV was inversely correlated with BMI (r2=0.165), and RM did not significantly alter EELV.

Conclusions:

  • End expiratory volume is substantially reduced following cardiac surgery.
  • EELV measurement is a novel tool providing valuable information during mechanical ventilation.
  • Recruitment maneuvers, including sighs, do not impact EELV in this context.