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Acute Respiratory Failure-II

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:

Pneumonia I: Introduction

Pneumonia I: Introduction

Pneumonia is an acute respiratory infection that targets the lungs, specifically the alveoli. These tiny air sacs, essential for oxygen exchange, become engorged with pus and fluid, severely hindering breathing, decreasing oxygen absorption, and causing significant pain and discomfort during respiration.
Risk Factors
Various factors influence the likelihood of developing pneumonia. Age plays a crucial role, with infants, children under two, and individuals over 65 at increased risk due to their...

Pneumonia I: Introduction

Pneumonia I: Introduction

Pneumonia is an infection of the lower respiratory tract that leads to inflammation of the lung parenchyma, often resulting in the accumulation of inflammatory exudate in the alveoli and airways. Unlike the watery, low-protein fluid exudate in pulmonary edema, the exudate in this case is a thick fluid rich in immune cells, proteins, and debris produced during infection and inflammation.This impairs gas exchange and can lead to consolidation of lung tissue. The infection may be caused by a...

Pneumothorax-I

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.

Atelectasis II: Pathophysiology

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...

Pneumothorax II: Pathophysiology

Pneumothorax II: Pathophysiology

Pneumothorax means the presence of air in the pleural space — the thin potential gap between the visceral and parietal pleura. This condition disrupts the normal pressure balance that keeps the lungs inflated, leading to partial or complete collapse of the affected lung.Normal physiologyUnder normal conditions, the pleural space maintains a slightly negative intrapleural pressure, which keeps the lungs expanded against the chest wall. This negative pressure creates a delicate balance between...

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Updated: Jul 5, 2026

Normothermic Negative Pressure Ventilation Ex Situ Lung Perfusion: Evaluation of Lung Function and Metabolism

Normothermic Negative Pressure Ventilation Ex Situ Lung Perfusion: Evaluation of Lung Function and Metabolism

Published on: February 14, 2022

Perioperative lung injury.

Peter Slinger¹

¹University of Toronto, Department of Anesthesia, 3 EN, Toronto General Hospital, 200 Elizabeth Street, Toronto, ON M5G 2C4, Canada. peter.slinger@uhn.on.ca

Best Practice & Research. Clinical Anaesthesiology

|May 23, 2008

Summary

This summary is machine-generated.

Perioperative mechanical ventilation can cause lung injury. Lung-protective strategies using smaller tidal volumes and positive end-expiratory pressure (PEEP) can reduce this risk.

Related Experiment Videos

Last Updated: Jul 5, 2026

Normothermic Negative Pressure Ventilation Ex Situ Lung Perfusion: Evaluation of Lung Function and Metabolism

Normothermic Negative Pressure Ventilation Ex Situ Lung Perfusion: Evaluation of Lung Function and Metabolism

Published on: February 14, 2022

Area of Science:

Anesthesiology
Pulmonology
Critical Care Medicine

Background:

Patients undergoing surgery face risks of perioperative lung injuries, including atelectasis, pneumonia, and acute respiratory distress syndrome.
Anesthetic management plays a critical role in the development, worsening, or improvement of these lung conditions.

Purpose of the Study:

To evaluate the impact of traditional versus lung-protective mechanical ventilation strategies on perioperative lung injury.
To highlight the benefits of lung-protective ventilation in mitigating perioperative lung injury.

Main Methods:

Review of clinical research trends in perioperative mechanical ventilation.
Comparison of outcomes associated with large tidal volumes versus physiologic tidal volumes with positive end-expiratory pressure (PEEP).

Main Results:

Traditional ventilation protocols with large tidal volumes and no PEEP can lead to sub-clinical lung injury.
This injury is exacerbated by other perioperative insults.
Lung-protective ventilation strategies demonstrate a potential to decrease the extent of perioperative lung injury.

Conclusions:

Lung-protective ventilation, characterized by physiologic tidal volumes and adequate PEEP, is crucial for reducing perioperative lung injury.
Anesthetic management strategies should incorporate lung-protective ventilation to improve patient outcomes.