The many faces of cytokine storm syndrome: immunopathogenic mechanisms and clinical implications for a better patient management

Abstract

Cytokine storm syndrome is a life-threatening hyperinflammatory condition characterized by excessive and dysregulated immune activation, leading to multiorgan dysfunction and poor clinical outcomes if not promptly recognized and adequately treated. Rather than representing a single disease entity, cytokine storm syndrome is increasingly understood as a final common pathogenic pathway shared by a broad spectrum of clinical conditions converging on overlapping immunopathological mechanisms driven by sustained cytokine production, immune-cell hyperactivation, and failure of immune-regulatory pathways. The clinical presentation of cytokine storm syndrome is characterized by rapidly progressive nature, multisystem involvement, and the diagnostic challenges arising from nonspecific symptoms and overlapping laboratory features. Hyperferritinaemia emerges as a central laboratory hallmark with both diagnostic and potential pathogenic relevance. Therapeutic management of cytokine storm syndrome requires early recognition and is guided by three core principles: supportive care for organ dysfunction, control of underlying triggers, and timely immunomodulatory or immunosuppressive interventions. Overall, cytokine storm syndrome represents a complex and heterogeneous clinical syndrome in which improved mechanistic understanding, biomarker development, and tailored therapeutic strategies are essential to optimize patient outcomes.