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Related Concept Videos

Acute Respiratory Failure-II01:21

Acute Respiratory Failure-II

Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
Acute Respiratory Failure-IV01:23

Acute Respiratory Failure-IV

Respiratory failure can manifest suddenly or gradually, characterized by a rapid decline in PaO2 and a rapid rise in PaCO2. This situation indicates a severe respiratory problem that may quickly become a life-threatening emergency. One of the early signs of hypoxemic Acute Respiratory Failure (ARF) is a change in mental status due to the brain's sensitivity to oxygen levels and changes in acid-base balance. Symptoms such as restlessness, confusion, and agitation suggest inadequate oxygen...
Atelectasis II: Pathophysiology01:10

Atelectasis II: Pathophysiology

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...
Hypoxia01:23

Hypoxia

Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
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...
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...

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Updated: Jun 13, 2026

A Swine Model of Neonatal Asphyxia
10:36

A Swine Model of Neonatal Asphyxia

Published on: October 11, 2011

Lung fluid movements in hypoxia.

Claudio Sartori1, Stefano F Rimoldi, Urs Scherrer

  • 1Department of Internal Medicine and the Botnar Center for Extreme Medicine, Centre Hospitalier Universitaire Vaudois, 1011 Lausanne, Switzerland. claudio.sartori@chuv.ch <claudio.sartori@chuv.ch>

Progress in Cardiovascular Diseases
|April 27, 2010
PubMed
Summary
This summary is machine-generated.

Pulmonary edema occurs when lung fluid balance is disrupted. Understanding Starling forces, sodium transport, and hypoxia is key to preventing and treating this serious condition.

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Last Updated: Jun 13, 2026

A Swine Model of Neonatal Asphyxia
10:36

A Swine Model of Neonatal Asphyxia

Published on: October 11, 2011

Point-of-Care Lung Ultrasound in Adults: Image Acquisition
09:17

Point-of-Care Lung Ultrasound in Adults: Image Acquisition

Published on: March 3, 2023

Real-time X-ray Imaging of Lung Fluid Volumes in Neonatal Mouse Lung
11:26

Real-time X-ray Imaging of Lung Fluid Volumes in Neonatal Mouse Lung

Published on: July 18, 2016

Area of Science:

  • Physiology
  • Pathophysiology
  • Altitude Medicine

Background:

  • Pulmonary edema is a critical clinical issue caused by disrupted lung fluid balance.
  • This imbalance arises from opposing forces driving fluid into lung airspaces and mechanisms for fluid removal.
  • Maintaining lung fluid homeostasis is vital for respiratory health.

Purpose of the Study:

  • To review the fundamental mechanisms regulating lung fluid homeostasis.
  • To discuss the role of hypoxia in high-altitude pulmonary edema (HAPE).
  • To explore interventions for preventing and treating pulmonary edema.

Main Methods:

  • Review of Starling forces governing fluid movement.
  • Analysis of respiratory transepithelial sodium transport.
  • Examination of hypoxia's impact on lung fluid balance.

Main Results:

  • Starling forces and sodium transport are central to lung fluid regulation.
  • Hypoxia significantly perturbs lung fluid homeostasis, leading to HAPE.
  • HAPE is a severe condition with high morbidity and mortality.

Conclusions:

  • Understanding lung fluid dynamics is crucial for managing pulmonary edema.
  • Targeting mechanisms of fluid imbalance and hypoxia is essential for HAPE prevention and treatment.
  • Interventions to restore lung fluid homeostasis offer therapeutic potential.