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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-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...
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-V01:29

Acute Respiratory Failure-V

The treatment for acute respiratory failure varies based on factors like the underlying cause, overall health, and severity. A collaborative healthcare team is essential for early detection, often through arterial blood gas analysis. Identifying the cause is the primary goal, with treatment strategies adjusted for ventilation/perfusion (V/Q) mismatch, shunting, or diffusion impairment.
Ensure that patients are monitored continuously for their response to therapy, including changes in...
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...
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...

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Updated: May 28, 2026

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

Acute lung failure.

Rob Mac Sweeney1, Daniel F McAuley, Michael A Matthay

  • 1Centre for Infection and Immunity, Queens University Belfast, Belfast, Northern Ireland.

Seminars in Respiratory and Critical Care Medicine
|October 13, 2011
PubMed
Summary
This summary is machine-generated.

Acute respiratory failure (ARF) is common in ICUs. This review covers common ARF causes, their pathology, and critical care management strategies, including supportive and specific therapies.

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Area of Science:

  • Critical Care Medicine
  • Pulmonology
  • Pathophysiology

Background:

  • Acute respiratory failure (ARF) is the most frequent organ failure in intensive care units.
  • Understanding the diverse etiologies of ARF is crucial for effective patient management.
  • Classifying ARF based on its origin aids in diagnosis and treatment.

Purpose of the Study:

  • To review the common causes of acute respiratory failure.
  • To discuss the pathological mechanisms underlying each cause of ARF.
  • To outline the principles of critical care management for ARF.

Main Methods:

  • Literature review of common causes of ARF.
  • Categorization of ARF by pathogenesis: neuromuscular, obstructive airway diseases, alveolar processes, and vascular diseases.
  • Focus on critical care principles and therapeutic strategies.

Main Results:

  • Identified neuromuscular disorders, COPD, pneumonia, pulmonary edema, and pulmonary embolism as common ARF causes.
  • Detailed the pathological mechanisms for each identified cause.
  • Summarized key supportive, specific, and adjunctive therapies for ARF management.

Conclusions:

  • Effective management of ARF requires accurate etiological diagnosis.
  • A systematic approach to ARF, considering its classification, is essential for critical care.
  • Tailored therapeutic strategies, including supportive and specific treatments, improve outcomes in ARF.