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Related Concept Videos

Chronic Obstructive Pulmonary Disease-II: Pathophysiology01:20

Chronic Obstructive Pulmonary Disease-II: Pathophysiology

Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
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...
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...
Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features01:24

Chronic Obstructive Pulmonary Disease III: Chronic Bronchitis Features

Chronic bronchitis is a key phenotype of chronic obstructive pulmonary disease (COPD), characterized by airway-centered inflammation and mucus overproduction. It develops from long-term exposure to harmful particles or gases, most commonly cigarette smoke, which triggers a persistent inflammatory response.Cellular and Structural ChangesInflammation initially affects the large bronchi and later the smaller airways, with infiltration by immune cells, including neutrophils, macrophages, and...
Chemical Factors Affecting Respiration Centers01:31

Chemical Factors Affecting Respiration Centers

Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
CO2 has a potent influence on respiration and is strictly regulated. Under...
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:

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Related Experiment Video

Updated: May 7, 2026

Measuring Carbon Content in Airway Macrophages Exposed to Carbon-Containing Particulate Matters
05:18

Measuring Carbon Content in Airway Macrophages Exposed to Carbon-Containing Particulate Matters

Published on: July 12, 2024

Carbon monoxide inhalation increases microparticles causing vascular and CNS dysfunction.

Jiajun Xu1, Ming Yang, Paul Kosterin

  • 1Department of Emergency Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104, USA.

Toxicology and Applied Pharmacology
|October 5, 2013
PubMed
Summary
This summary is machine-generated.

Carbon monoxide (CO) poisoning increases circulating microparticles (MPs) and activates neutrophils, leading to tissue injury. Treating with a microparticle-lytic agent prevented these CO-induced effects.

Keywords:
Action potentialLeukocytesNeurohypophysisNeutrophil activationPlateletsVascular leak

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Published on: August 25, 2017

Area of Science:

  • Toxicology
  • Cell Biology
  • Neuroscience

Background:

  • Carbon monoxide (CO) is a toxic gas known to cause cellular damage.
  • The precise mechanisms underlying CO-induced tissue injury, particularly neuroinflammation, remain incompletely understood.
  • Circulating microparticles (MPs) are implicated in various inflammatory conditions.

Purpose of the Study:

  • To investigate the role of circulating microparticles (MPs) in the pro-inflammatory effects of carbon monoxide (CO) inhalation.
  • To determine if CO exposure leads to increased MPs and subsequent tissue and nerve dysfunction.
  • To explore the therapeutic potential of targeting MPs in CO poisoning.

Main Methods:

  • Mice were exposed to varying concentrations of CO.
  • Circulating MPs and neutrophil activation were quantified.
  • Tissue injury was assessed via vascular leakage and neutrophil sequestration in brain and muscle.
  • Nerve dysfunction was measured by action potential broadening.
  • Mice lacking myeloperoxidase were used to assess its role.
  • MP-lytic agent (polyethylene glycol telomere B) and MPs from CO-exposed mice were infused.

Main Results:

  • CO inhalation increased circulating MPs and neutrophil activation in mice.
  • Tissue injury, including vascular leakage and neutrophil sequestration, and nerve dysfunction (action potential prolongation) were observed following CO exposure.
  • Treatment with a microparticle-lytic agent abrogated CO-induced injuries.
  • Mice lacking myeloperoxidase showed no CO-induced tissue injury.
  • Infusion of MPs from CO-exposed mice induced vascular leakage and nerve dysfunction in naive mice.

Conclusions:

  • CO poisoning elevates circulating MPs, which activate neutrophils.
  • Activated neutrophils contribute to CO-induced tissue injury and central nervous system dysfunction.
  • Targeting microparticles represents a potential therapeutic strategy for CO poisoning.