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Related Concept Videos

Pulmonary Ventilation: Inhalation01:24

Pulmonary Ventilation: Inhalation

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...
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...
Pulmonary Cycle: Exhalation01:17

Pulmonary Cycle: Exhalation

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...
Pressure Relationships in Thoracic Cavity01:24

Pressure Relationships in Thoracic Cavity

Breathing, otherwise known as pulmonary ventilation, is the process of air movement into and out of the lungs. The main mechanisms propelling pulmonary ventilation are atmospheric pressure (Patm), intra-pulmonary (Ppul ) or intra-alveolar pressure (Palv) within the alveoli, and intrapleural pressure (Pip) within the pleural cavity.
Breathing Mechanisms
Both intra-alveolar and intrapleural pressures rely on specific lung properties. The ability to breathe—allowing air to enter the lungs during...
Hyperpnea and Hyperventilation01:25

Hyperpnea and Hyperventilation

Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
Acute Respiratory Failure-III01:30

Acute Respiratory Failure-III

Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without causing...

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Related Experiment Video

Updated: Jul 19, 2026

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics
12:09

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics

Published on: April 19, 2024

Alveolar recruitment versus hyperinflation: A balancing act.

Ron Dueck1

  • 1Department of Anesthesiology, University of California, San Diego, California, USA. rdueck@ucsd.edu

Current Opinion in Anaesthesiology
|November 10, 2006
PubMed
Summary

Optimizing positive end-expiratory pressure (PEEP) is crucial for minimizing lung injury from cyclical recruitment and derecruitment. Thoracic tomography aids in balancing lung recruitment and overdistension for better oxygenation and reduced hypercarbia.

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Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome (ARDS)
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Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome (ARDS)

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Related Experiment Videos

Last Updated: Jul 19, 2026

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics
12:09

Ex Vivo Porcine Experimental Model for Studying and Teaching Lung Mechanics

Published on: April 19, 2024

Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome (ARDS)
06:22

Surfactant Depletion Combined with Injurious Ventilation Results in a Reproducible Model of the Acute Respiratory Distress Syndrome (ARDS)

Published on: April 7, 2021

Area of Science:

  • Mechanical Ventilation
  • Respiratory Physiology
  • Critical Care Medicine

Background:

  • Cyclical recruitment of atelectasis causes acute lung injury.
  • Positive end-expiratory pressure (PEEP) titration is complex in acute lung injury (ALI).
  • Regional lung mechanics differ from whole-lung mechanics.

Purpose of the Study:

  • To explore lung recruitment strategies using pressure/volume curves.
  • To evaluate regional recruitment versus hyperinflation with thoracic imaging.
  • To optimize PEEP settings for 'open lung' ventilation.

Main Methods:

  • Analysis of static pressure/volume inflation curves.
  • Utilizing computed tomography (CT) and electrical impedance tomography (EIT).
  • Assessing regional pressure/volume relationships and ventilation-perfusion (V/Q) matching.

Main Results:

  • Lower inflection point plus 2 cmH2O PEEP may be insufficient for severe ALI.
  • CT and EIT can guide PEEP titration for regional lung recruitment.
  • Regional PEEP requirements may not be predictable from global curves.
  • Balancing PEEP involves managing hyperinflation and V/Q mismatch.

Conclusions:

  • Sufficient PEEP is essential to prevent recruitment/derecruitment.
  • Thoracic tomography is valuable for balancing recruitment and overdistension.
  • Optimizing PEEP improves oxygenation while limiting hypercarbia.