EP24: Sepsis and Thrombosis: A Complex and Dangerous Relationship

Episode 24 explores the thrombotic consequences of infection and sepsis, potentially devastating complications that can contribute to organ dysfunction and worsen patient outcomes. Join us in spreading awareness and advancing patient care!

At Werfen, we are dedicated to advancing patient care through education and awareness initiatives that support better understanding and management of thrombotic disorders. This episode explores the impact of heat on the human body, with particular attention to cardiovascular function, venous health, and the risk of thrombosis.

Introduction

Sepsis is a life-threatening condition caused by a dysregulated response to infection, frequently associated with bacteremia. It triggers widespread inflammation, leading to organ impairment and, in severe cases, organ failure. Despite advances in critical care and antimicrobial therapies, sepsis remains a major cause of morbidity and mortality worldwide, posing a major global healthcare challenge.

Impact of Sepsis on Thrombosis

In patients with sepsis, coagulation pathways are frequently activated, promoting a prothrombotic state that may contribute to clot development and worsen disease severity and clinical outcomes. Coagulation abnormalities can range from mild thrombocytopenia and subtle clotting disturbances to severe disseminated intravascular coagulation.

Pathophysiology

Immunothrombosis reflects the close interplay between the immune and coagulation systems, serving as a protective mechanism against infection and tissue injury. In sepsis, this defense becomes dysregulated, with inflammation, leukocyte activation, and endothelial injury driving excessive thrombin generation and clot formation. Impaired anticoagulant and fibrinolytic mechanisms promote microvascular thrombosis, compromising organ perfusion, reducing oxygen delivery, and contributing to multi-organ failure.

Sepsis-Induced Coagulopathy

Sepsis-induced coagulopathy (SIC) is an early and clinically significant manifestation of sepsis-related hemostatic dysfunction, characterized by excessive inflammation, endothelial damage, and microvascular thrombosis. Affecting approximately one-quarter of patients with sepsis, SIC is strongly associated with organ failure and mortality. As a precursor to overt disseminated intravascular coagulation, its early recognition is essential.

Septic venous thrombosis

Septic venous thrombosis (SVT) is a rare but serious condition occurring in the context of bacterial or fungal infection. Common sites include the portal, pelvic, jugular, and catheter-associated veins. Although uncommon, SVT can result in significant complications, especially in patients with severe sepsis, immunosuppression, or delayed diagnosis, with mortality rates exceeding 10% in some cases.

Diagnosis

Diagnosing coagulation disorders in sepsis remains challenging due to their evolving pathophysiology and often nonspecific clinical presentation. According to the 2025 ISTH recommendations, SIC is evaluated using platelet count, prothrombin time, and the Sequential Organ Failure Assessment (SOFA) score to capture organ dysfunction. In contrast, SVT is primarily identified through imaging techniques, including Doppler ultrasound, contrast-enhanced computed tomography, or magnetic resonance imaging.

Management of Thrombotic Complications in Sepsis

Effective management should start with prompt control of the underlying infection through targeted antimicrobial therapy and appropriate supportive care. In patients with confirmed thrombotic events, anticoagulation should be considered only after careful assessment of the bleeding risk, with low-molecular-weight heparin generally recommended as the preferred therapeutic option.

Conclusion and Outlook

Thrombosis is increasingly recognized as a major contributor to poor outcomes in sepsis, connecting dysregulated inflammation with organ dysfunction and mortality. Increasing awareness of sepsis-associated thrombosis is essential for improving patient outcomes. Early recognition of coagulation abnormalities and timely intervention can help reduce thrombotic complications, limit organ damage, and ultimately decrease mortality.