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Related Concept Videos

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...
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 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 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.

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Related Experiment Video

Updated: Jun 25, 2026

Inspiratory Muscle Training as an Adjunct to the Treatment of Weaning Failure in Critically Ill Patients: A Practical Guide
04:16

Inspiratory Muscle Training as an Adjunct to the Treatment of Weaning Failure in Critically Ill Patients: A Practical Guide

Published on: January 30, 2026

Changes in functional residual capacity during weaning from mechanical ventilation: a pilot study.

Hermann Heinze1, Beate Sedemund-Adib, Matthias Heringlake

  • 1Department of Anesthesiology, University of Lübeck, Ratzeburger Allee 160, 23538 Lübeck, Germany. hermann.heinze@uk-sh.de

Anesthesia and Analgesia
|February 20, 2009
PubMed
Summary

Functional residual capacity (FRC) decreased during mechanical ventilation weaning in cardiac surgery patients. This reduction may be linked to alveolar derecruitment, suggesting FRC changes could inform weaning protocols.

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Inspiratory Muscle Training as an Adjunct to the Treatment of Weaning Failure in Critically Ill Patients: A Practical Guide
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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
  • Mechanical Ventilation

Background:

  • Pressure support ventilation (PSV) and reduced positive end-expiratory pressure (PEEP) are common before extubation.
  • The effect of PSV on functional residual capacity (FRC) during weaning is not well understood.
  • Investigating FRC changes during weaning protocols in post-cardiac surgery patients is crucial.

Purpose of the Study:

  • To assess changes in functional residual capacity (FRC) and pulmonary function during a mechanical ventilation weaning protocol.
  • To evaluate the impact of different ventilation settings on FRC in patients recovering from cardiac surgery.
  • To explore potential links between FRC dynamics and alveolar changes during the weaning process.

Main Methods:

  • Utilized the LUFU system for FRC estimation via oxygen washout.
  • Monitored postoperative cardiac surgery patients through ventilation stages: BiPAP 10, BiPAP 7, CPAP 7_1, and CPAP 7_2.
  • Measured FRC and pulmonary function parameters at each ventilation stage.

Main Results:

  • A statistically significant decrease in FRC was observed across ventilation stages (P = 0.017).
  • Pulmonary to fraction of inspired oxygen (PF) ratio also decreased significantly (P = 0.045).
  • No significant changes in PaCO(2) levels were detected during the weaning protocol (P = 0.221).

Conclusions:

  • Decreased FRC during weaning after cardiac surgery may indicate alveolar derecruitment.
  • Further research is needed to determine if FRC monitoring can guide mechanical ventilation weaning strategies.
  • Alveolar derecruitment is a potential factor contributing to reduced FRC in this patient population.