Sepsis and Septic Shock

What are the causative agents of sepsis and septic shock?

Any microorganism that causes a systemic infection can lead to sepsis and septic shock.

What type of bacteria are most commonly associated with fatal cases of sepsis?

Gram-negative bacteria because they contain endotoxin (LPS).

What part of LPS triggers inflammation?

The Lipid A portion.

How does endotoxin contribute to septic shock?

Large amounts of endotoxin trigger an overwhelming inflammatory response that can lead to septic shock.

Can only Gram-negative bacteria cause sepsis?

No. Any microorganism can cause sepsis, but Gram-negative bacteria are associated with many of the most severe and fatal cases.

What is the pathogenesis of sepsis and septic shock?

Sepsis usually begins with an infection somewhere in the body. Microbes enter the bloodstream and trigger an overwhelming inflammatory response. Large amounts of cytokines are released, causing widespread inflammation, tissue damage, organ dysfunction, and potentially septic shock.

How does sepsis typically begin?

It usually starts as a localized infection outside the bloodstream that later spreads.

What happens when pattern recognition receptors (PRRs) detect microbes?

Macrophages and neutrophils recognize microbial molecules and release cytokines to start an immune response.

What is a cytokine storm?

An uncontrolled release of cytokines that causes widespread inflammation throughout the body.

How does a cytokine storm contribute to septic shock?

It causes blood vessels to become leaky, lowering blood volume and blood pressure, which can lead to shock.

Why are the lungs especially vulnerable during sepsis?

Inflammation and fluid buildup in the lungs interfere with oxygen exchange.

How does the complement system contribute to sepsis?

It amplifies the inflammatory response, making tissue damage worse.

What is DIC and how does it develop during sepsis?

Disseminated intravascular coagulation (DIC) occurs when widespread clotting develops throughout small blood vessels, leading to organ failure and bleeding.

Why does DIC cause organ failure?

Small blood clots block blood flow and oxygen delivery to organs.

Why does DIC cause bleeding?

The body's clotting proteins are used up, leaving too few available to stop bleeding.

What is the epidemiology of sepsis and septic shock?

Sepsis is mainly a healthcare-associated disease that occurs in patients with weakened immune systems or bloodstream infections.

What medical devices increase the risk of sepsis?

Catheters, ventilators, and other devices that allow biofilms to develop.

How is sepsis treated?

Treatment includes antimicrobial medications, fluid replacement, oxygen support, and management of organ dysfunction.

Why must antibiotics be used carefully in sepsis?

Bactericidal antibiotics can break open bacterial cells, releasing more inflammatory substances and potentially worsening inflammation.

How can sepsis be prevented?

By identifying and treating localized infections quickly before they spread.