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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-I01:21

Acute Respiratory Failure-I

Acute respiratory failure is a condition characterized by the inability of the lungs to perform their primary function: gas exchange. This failure leads to insufficient oxygen levels (hypoxemia) in the blood, elevated carbon dioxide levels (hypercapnia), or both, causing critical impairment in organ function.
Definition: It is defined by specific criteria based on blood gas measurements. Hypoxemia happens when the partial pressure of oxygen (PaO2) falls below 60 mmHg. At the same time,...
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...
Pneumothorax-I01:26

Pneumothorax-I

A pneumothorax is a condition where air builds up in the space between the lung and the chest wall, causing the lung to collapse. This condition arises when air enters the space between the parietal and visceral pleura, disrupting the negative pressure essential for lung inflation. This can lead to a partial or complete collapse of the lung.
Pneumothorax can be even further classified as spontaneous, traumatic, and tension pneumothorax.
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...

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Visualizing Lung Cellular Adaptations during Combined Ozone and LPS Induced Murine Acute Lung Injury
14:48

Visualizing Lung Cellular Adaptations during Combined Ozone and LPS Induced Murine Acute Lung Injury

Published on: March 21, 2021

Hyperoxic acute lung injury.

Richard H Kallet1, Michael A Matthay

  • 1Respiratory Care Services, Department of Anesthesia, University of California, San Francisco at San Francisco General Hospital, San Francisco, California 94110, USA. rich.kallet@ucsf.edu

Respiratory Care
|December 29, 2012
PubMed
Summary
This summary is machine-generated.

High oxygen concentrations (fraction of inspired oxygen [F(IO(2))] ≥ 0.9) cause severe lung injury and are often fatal. While modern ventilation reduces risk, some patients still require hyperoxic therapy, necessitating adjunctive treatments to prevent hyperoxic acute lung injury (HALI).

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Visualizing Lung Cellular Adaptations during Combined Ozone and LPS Induced Murine Acute Lung Injury
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Open Tracheostomy Gastric Acid Aspiration Murine Model of Acute Lung Injury Results in Maximal Acute Nonlethal Lung Injury
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Published on: February 26, 2017

Area of Science:

  • Pulmonary Medicine
  • Critical Care Medicine
  • Toxicology

Background:

  • Prolonged exposure to high fraction of inspired oxygen (F(IO(2))) (≥ 0.9) uniformly causes severe hyperoxic acute lung injury (HALI), often proving fatal.
  • HALI severity correlates with partial pressure of oxygen (P(O(2))) and exposure duration, particularly when P(O(2)) exceeds 450 mm Hg (F(IO(2)) 0.6).
  • Hyperoxia generates excessive reactive oxygen species, overwhelming antioxidant defenses and causing cellular damage through multiple pathways; genetic predisposition may influence HALI susceptibility in humans.

Purpose of the Study:

  • To review the mechanisms, clinical risks, and historical context of hyperoxic acute lung injury (HALI).
  • To discuss the impact of evolving mechanical ventilation strategies on HALI incidence.
  • To highlight the continued risk of HALI in specific patient populations requiring hyperoxic therapy.

Main Methods:

  • Literature review of hyperoxia effects on lung injury.
  • Analysis of historical and current clinical practices in mechanical ventilation and oxygen therapy.
  • Examination of factors influencing HALI development, including oxygen concentration, duration, and patient genetics.

Main Results:

  • Clinical risk of HALI increases when F(IO(2)) exceeds 0.7 and becomes significant at F(IO(2)) > 0.8 for extended periods.
  • Mechanical ventilation and hyperoxia can potentiate lung injury and increase infection risk.
  • Advancements like PEEP, precise F(IO(2)) control, and lung-protective ventilation have significantly reduced HALI risk in most patients.

Conclusions:

  • Despite advancements, a subset of patients with severe ARDS requiring hyperoxic therapy remains at substantial risk for HALI.
  • Adjunctive therapies are justified for these high-risk patients to mitigate HALI.
  • Understanding the dose-response relationship and individual susceptibility is crucial for managing hyperoxia.