Beyond thrombosis: the versatile platelet in critical illness.

Area of Science:

• Critical care medicine
• Hematology
• Immunology

Background:

• Sepsis, acute lung injury, and ARDS are major causes of ICU mortality.
• These conditions involve apoptosis, microvascular dysfunction, coagulation abnormalities, and immune dysregulation.
• Platelets, traditionally linked to thrombosis, are increasingly recognized for their role in inflammation.

Purpose of the Study:

• To explore the multifaceted role of platelets in critical illnesses like sepsis and ARDS.
• To highlight how platelet activation influences inflammatory responses and patient outcomes.
• To identify potential therapeutic strategies targeting platelet function.

Main Methods:

• Literature review of recent evidence on platelet involvement in critical illness.
• Analysis of platelet contributions to vascular injury, immune orchestration, and leukocyte recruitment.
• Examination of molecular pathways including adenosine, polyphosphates, and platelet transcriptome/proteome.

Main Results:

• Platelets contribute to organ damage in sepsis and ARDS through thrombotic and inflammatory mechanisms.
• Maladaptive platelet activation and aggregation are implicated in poor patient outcomes.
• Platelets actively participate in orchestrating immune responses and leukocyte trafficking.

Conclusions:

• Platelets are pivotal in the pathobiology of sepsis, acute lung injury, and ARDS.
• Targeting platelet activation presents a promising avenue for novel therapies.
• Further research into platelet mechanisms can improve risk stratification and treatment strategies.