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Acute infectious purpura fulminans: pathogenesis and medical management
1Department of Pediatrics, Children's Hospital and Regional Medical Center, University of Washington School of Medicine, Seattle 98105, USA. gdarms@chmc.org
Abstract:
Purpura fulminans (PF) is a potentially disabling and life-threatening disorder characterized by acute onset of progressive cutaneous hemorrhage and necrosis, and disseminated intravascular necrosis. Acute infectious PF occurs most commonly in the setting of meningococcemia due to elaboration of endotoxin. Presence of purpura, particularly when generalized, is an important predictor of a poor outcome following meningococcal infection. Histopathologic hallmarks of acute infectious PF are dermal vascular thrombosis and secondary hemorrhagic necrosis, findings which are identical to those of the Shwartzman reaction. Acute infectious PF and the Shwartzman reaction have a common pathogenesis, involving a disturbance in the balance of anticoagulant and procoagulant activities of endothelial cells. This disturbance, which is triggered by endotoxin, appears to be mediated by cytokines, particularly interleukin-12, interferon-gamma, tumor necrosis factor-alpha, and interleukin-1, leading to the consumption of proteins C and S and antithrombin III. State-of-the-art therapeutic interventions based on recent advances in our understanding of the pathogenesis of acute infectious PF are discussed.
Insights
Purpura fulminans (PF) is a severe condition causing skin necrosis and blood clotting issues, often linked to meningococcemia. Understanding its cytokine-driven pathogenesis is key to developing new treatments.
Area of Science:
- Pathology
- Immunology
- Infectious Diseases
Background:
- Purpura fulminans (PF) is a critical disorder with rapid skin hemorrhage and necrosis.
- Acute infectious PF is frequently associated with meningococcemia and endotoxin release.
- Generalized purpura indicates a poor prognosis in meningococcal infections.
Purpose of the Study:
- To elucidate the pathogenesis of acute infectious Purpura fulminans.
- To discuss advanced therapeutic strategies based on recent pathogenetic insights.
- To highlight the link between PF and the Shwartzman reaction.
Main Methods:
- Histopathological analysis of dermal vascular thrombosis and hemorrhagic necrosis.
- Investigation of endothelial cell anticoagulant/procoagulant balance.
- Examination of cytokine mediation (IL-12, IFN-γ, TNF-α, IL-1) in pathogenesis.
Main Results:
- PF shares pathogenetic mechanisms with the Shwartzman reaction.
- Endotoxin triggers endothelial dysfunction, mediated by specific cytokines.
- Consumption of anticoagulant proteins (Protein C, S, Antithrombin III) is a key feature.
Conclusions:
- Acute infectious PF involves a cytokine-induced imbalance in endothelial hemostasis.
- Understanding these mechanisms informs novel therapeutic interventions.
- Early recognition of purpura is crucial for patient outcomes.