[Disturbances in coagulation, fibrinolytic and complement systems in septic shock]

Area of Science:

• Biochemistry
• Immunology
• Hematology

Context:

• Septic shock is a life-threatening condition characterized by dysregulated host response to infection.
• Coagulation, fibrinolysis, and complement systems play crucial roles in the pathogenesis of sepsis.
• Understanding protein level changes in septic shock is vital for diagnosis and prognosis.

Purpose:

• To investigate plasma levels of key proteins involved in coagulation, fibrinolysis, and complement activation in septic shock patients.
• To elucidate the specific pathways of coagulation and complement activation implicated in septic shock.
• To evaluate the prognostic significance of specific protein level changes in septic shock.

Summary:

• Plasma levels of contact factors (prekallikrein) and complement proteins (C4, HRG, alpha 2-macroglobulin) are significantly decreased in septic shock.
• Findings suggest primary involvement of the contact phase of coagulation and the alternative complement pathway in septic shock.
• Consumption of Factor XIII (F XIII) indicates thrombin generation, while reduced C4 may result from isolated proteolysis.
• Prognostic indicators include increased F XIII A levels (favorable) and persistently low F XIII/fibronectin (unfavorable).

Impact:

• Provides insights into the complex molecular mechanisms underlying septic shock.
• Identifies potential biomarkers for diagnosing septic shock and predicting patient outcomes.
• Highlights the differential involvement of complement pathways in septic shock, suggesting targeted therapeutic strategies.