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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...

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...

Acute Respiratory Failure-III

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-I

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,...

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Updated: Jun 5, 2026

Open Tracheostomy Gastric Acid Aspiration Murine Model of Acute Lung Injury Results in Maximal Acute Nonlethal Lung Injury

Open Tracheostomy Gastric Acid Aspiration Murine Model of Acute Lung Injury Results in Maximal Acute Nonlethal Lung Injury

Published on: February 26, 2017

Aspiration-induced lung injury.

Krishnan Raghavendran¹, Jean Nemzek, Lena M Napolitano

¹Department of Surgery, University of Michigan, Ann Arbor, MI, USA. kraghave@umich.edu

Critical Care Medicine

|January 26, 2011

Summary

Diagnosing aspiration pneumonia in intensive care units (ICUs) is challenging. New biomarkers and predictive models show promise for improving the diagnosis and management of aspiration syndromes.

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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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Area of Science:

Critical care medicine
Pulmonology

Background:

Aspiration of oropharyngeal or gastric contents into the lower respiratory tract is common in critically ill patients.
Aspiration pneumonia is a leading cause of pneumonia in the intensive care unit (ICU) and a risk factor for acute lung injury and acute respiratory distress syndrome.
Diagnosis is often challenging, relying on exclusion and characterized by vague radiographic findings and hypoxia.

Purpose of the Study:

To review the definitions, diagnosis, epidemiology, pathophysiology, and evidence-based management of aspiration.
To provide a review of current and potential biomarkers for aspiration in humans.

Main Methods:

A comprehensive literature search was conducted using PubMed and its "related articles" feature.

Main Results:

Aspiration in the ICU is a significant clinical issue demanding expertise.
Accurate diagnosis of aspiration pneumonitis or pneumonia remains difficult.
Biomarker profiles and prediction models may improve diagnosis and prognosis.

Conclusions:

Evidence-based management includes supportive care, mechanical ventilation, bronchoscopy for particulate aspiration, empiric antibiotics for pneumonia, and lower respiratory tract sampling.
Advances in biomarkers and predictive models are crucial for enhancing the diagnosis and prognosis of aspiration syndromes.