Pathophysiology of sepsis.

Area of Science:

• Pathophysiology of infectious diseases
• Immunology
• Hematology

Background:

• Sepsis is a life-threatening condition triggered by infection.
• It involves a systemic inflammatory response syndrome (SIRS) with clinical symptoms like fever, tachycardia, and altered white blood cell counts.
• Severe sepsis is characterized by organ dysfunction or metabolic acidosis.

Purpose of the Study:

• To describe the roles of inflammation and coagulation in sepsis pathophysiology.
• To explain the mechanisms linking inflammatory responses to coagulation activation and microvascular thrombosis.
• To highlight the impact of mediator balance on patient outcomes.

Main Methods:

• Review of existing literature on sepsis pathophysiology.
• Description of the inflammatory cascade involving cytokines (TNF-alpha, interleukins, prostaglandins).
• Explanation of the activation of the extrinsic coagulation cascade and inhibition of fibrinolysis.

Main Results:

• Inflammatory mediators activate coagulation and inhibit fibrinolysis, leading to microvascular thrombosis.
• Coagulation activation consumes endogenous anticoagulants (protein C, antithrombin), promoting thrombosis.
• Dysregulation of both inflammatory and anti-inflammatory mediators contributes to organ dysfunction and poor outcomes.

Conclusions:

• Sepsis is a complex syndrome involving the interplay of inflammation and coagulation systems.
• Microvascular thrombosis due to dysregulated inflammation and coagulation is a key factor in organ dysfunction.
• Maintaining a balance of inflammatory and anti-inflammatory mediators is crucial for sepsis management and patient outcomes.