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Related Concept Videos

Acute Inflammation II: Cellular Phase01:26

Acute Inflammation II: Cellular Phase

The cellular phase of acute inflammation is a tightly orchestrated sequence of events that recruits leukocytes, primarily neutrophils, to sites of tissue injury or infection. Following the initial vascular changes, this phase ensures effective immune cell migration, activation, and function at the affected site to eliminate pathogens and initiate tissue repair.Leukocyte Recruitment CascadeLeukocyte recruitment happens in four steps: margination, adhesion, transmigration, and chemotaxis. Reduced...
Acute Inflammation III: Local and Systemic Effects01:25

Acute Inflammation III: Local and Systemic Effects

Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...
Cellular Injury I: Introduction01:00

Cellular Injury I: Introduction

Cellular injury occurs when a cell cannot maintain homeostasis or adapt to stressors such as hypoxia, toxins, or trauma. Depending on severity and duration, injury may be reversible, allowing recovery, or irreversible, leading to cell death.General Mechanisms of Cell InjuryAlthough causes vary, most cellular injuries arise from a few key mechanisms that disrupt essential functions and often amplify one another. Cell survival depends on the extent and balance of these disturbances.ATP depletion...
Inflammatory Response I: Vascular and Cellular01:30

Inflammatory Response I: Vascular and Cellular

The inflammatory response is the body's defense against infection, injury, or irritation from bacteria, trauma, toxins, or heat. Inflammation helps locate and destroy pathogens and remove damaged tissue elements to heal the body. During this initial phase, fluid, blood products, and nutrients migrate to the injured area, resulting in redness, heat, swelling, ache, and loss of function. Moreover, signs of systemic inflammation include fever, increased WBC count, malaise, anorexia, nausea,...
Cellular Injury IV: Necrosis01:16

Cellular Injury IV: Necrosis

Necrosis is a form of irreversible cell death caused by severe injury such as ischemia, toxins, or trauma. Unlike programmed cell death, it is an uncontrolled, pathological process that typically provokes inflammation in surrounding tissues.Pathophysiologic ChangesNecrosis begins when cells sustain critical damage, leading to swelling of organelles, particularly mitochondria, and rapid ATP depletion. As energy levels decline, membrane ion pumps fail, leading to calcium influx and eventually,...
Cellular Injury IlI: Cellular Death01:11

Cellular Injury IlI: Cellular Death

Cell death is the irreversible loss of cellular structure and function, representing the final stage of severe injury. It plays a key role in both normal physiology and disease.Types of Cell DeathThe two main types are necrosis and apoptosis, though others like necroptosis and pyroptosis also exist.Necrosis:Necrosis is an unregulated form of cell death caused by severe injury such as trauma, toxins, or ischemia. It is characterized by cell swelling, membrane loss, rupture, and leakage of...

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Cecal Ligation Puncture Procedure
11:53

Cecal Ligation Puncture Procedure

Published on: May 7, 2011

Cellular processes in sepsis.

Alain Rudiger1, Martin Stotz, Mervyn Singer

  • 1Medical Intensive Care Unit, University Hospital Zurich, Zurich, Switzerland. alain.rudiger@usz.ch

Swiss Medical Weekly
|November 14, 2008
PubMed
Summary
This summary is machine-generated.

Sepsis, a severe infection response, causes organ dysfunction through cellular energy failure. This dysfunction may be a protective hibernation-like state, reversible upon infection clearance.

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Cecal Ligation Puncture Procedure
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Design of Cecal Ligation and Puncture and Intranasal Infection Dual Model of Sepsis-Induced Immunosuppression
07:30

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Evaluation of a Reliable Biomarker in a Cecal Ligation and Puncture-Induced Mouse Model of Sepsis
05:28

Evaluation of a Reliable Biomarker in a Cecal Ligation and Puncture-Induced Mouse Model of Sepsis

Published on: December 9, 2022

Area of Science:

  • Critical care medicine
  • Cellular biology
  • Immunology

Background:

  • Sepsis is a prevalent, life-threatening condition characterized by systemic inflammation following infection.
  • It leads to significant morbidity, mortality, and substantial healthcare costs.
  • Understanding sepsis progression from infection to multi-organ failure is crucial.

Purpose of the Study:

  • To describe the cellular mechanisms underlying sepsis progression.
  • To elucidate the role of mitochondrial dysfunction in sepsis-induced organ dysfunction.
  • To explore the hypothesis that organ dysfunction in sepsis is a protective, reversible state.

Main Methods:

  • Review of the pathophysiology of sepsis.
  • Emphasis on cellular responses, including pathogen recognition and mediator cascades.
  • Analysis of mitochondrial function and cellular energy balance during sepsis.

Main Results:

  • Sepsis triggers a complex inflammatory response involving pro- and anti-inflammatory mediators.
  • Mitochondrial damage is a key feature, leading to cellular energy failure.
  • Organ dysfunction in sepsis appears to be functional, not necrotic, suggesting a reversible state.

Conclusions:

  • Sepsis-induced organ dysfunction may be a protective mechanism, analogous to hibernation.
  • This state is potentially reversible once the infection and inflammation subside.
  • Further research is needed for targeted therapies to reduce sepsis morbidity and mortality.