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Related Concept Videos

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...
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.
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Pulmonary Edema II: Pathophysiology01:18

Pulmonary Edema II: Pathophysiology

Pulmonary edema is the accumulation of fluid in the interstitial and alveolar spaces of the lungs, impairing gas exchange and oxygen delivery. It may be cardiogenic or noncardiogenic, but both reduce oxygenation and lung compliance.Cardiogenic Pulmonary EdemaCardiogenic edema results from increased hydrostatic pressure in pulmonary capillaries, usually due to left ventricular dysfunction from myocardial infarction, heart failure, or valvular disease. Ineffective cardiac pumping causes blood to...
Vascular Resistance01:20

Vascular Resistance

Vascular resistance is a critical concept in understanding blood flow dynamics in the circulatory system. It refers to the resistance that blood encounters as it flows through the blood vessels. This resistance is a key factor in determining blood pressure and cardiac workload.
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Pleural Effusion I: Introduction01:25

Pleural Effusion I: Introduction

Pleural effusion is an abnormal fluid accumulation in the pleural cavity, a narrow space between the lungs and the chest wall. It is not a disease per se but rather a symptom or indication of an underlying disease. In normal circumstances, this space contains a small amount of fluid (5 to 15 mL), a lubricant facilitating the non-frictional movement of the pleural surfaces.
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Atelectasis II: Pathophysiology01:10

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Atelectasis develops when alveoli lose their air and collapse inward. Because lung tissue is naturally elastic, these air sacs shrink rather than remaining open. Collapsed alveoli are no longer ventilated, reducing their role in gas exchange. Blood flow may continue in these regions, creating a ventilation–perfusion mismatch. Clinical findings include decreased breath sounds, dullness to percussion, reduced chest expansion, and decreased tactile fremitus as sound transmission through collapsed...

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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

Perivascular fluid cuffs decrease lung compliance by increasing tissue resistance.

Kevin Lowe1, Diego F Alvarez, Judy A King

  • 1Department of Surgery, Center for Lung Biology, University of South Alabama, Mobile, Alabama, USA.

Critical Care Medicine
|April 20, 2010
PubMed
Summary
This summary is machine-generated.

Perivascular fluid cuffs decrease lung compliance by impairing the mechanical coupling of the bronchovascular bundle to lung tissue. This occurs without causing alveolar edema or affecting central venous pressure.

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Last Updated: Jun 13, 2026

Measurement of the Pressure-volume Curve in Mouse Lungs
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Area of Science:

  • Pulmonary physiology
  • Respiratory mechanics
  • Vascular biology

Background:

  • Lung inflammation can lead to perivascular fluid cuffs around extra-alveolar blood vessels.
  • The physiological impact of these cuffs on lung function is not well understood.
  • This study investigates the direct effect of perivascular cuffs on lung compliance.

Purpose of the Study:

  • To test the hypothesis that perivascular fluid cuffs alone can decrease lung compliance.
  • To elucidate the mechanisms by which these cuffs affect respiratory mechanics.

Main Methods:

  • A prospective, randomized, controlled study was conducted in a research laboratory setting.
  • 120 male CD40 rats were used, with thapsigargin infused to induce perivascular cuffs.
  • Lung mechanics, hemodynamics, and cardiac function were continuously monitored.

Main Results:

  • Thapsigargin induced perivascular cuffs without alveolar flooding or blood gas changes.
  • Lung compliance decreased dose-dependently due to increased tissue resistance (damping and elastance).
  • Cardiac output was reduced by 50%, but rolipram (a PDE4 inhibitor) prevented cuff formation and compliance reduction.

Conclusions:

  • Perivascular cuff formation negatively impacts the mechanical coupling between the bronchovascular bundle and lung parenchyma.
  • This cuff formation decreases lung compliance independently of alveolar edema or changes in central venous pressure.
  • Rolipram demonstrated a protective effect against thapsigargin-induced lung mechanical changes.