Complement and contact system activation in acute congestive heart failure patients

Area of Science:

• Immunology
• Cardiology
• Biochemistry

Background:

• Experimental data suggest complement activation is pathogenic in congestive heart failure (CHF).
• The role of contact and complement systems in acute CHF episodes requires further investigation.

Purpose of the Study:

• To evaluate contact and complement systems activation in patients hospitalized for acute CHF.
• To explore differences in activation based on ejection fraction (EF) and clinical outcome.

Main Methods:

• Enrolled 42 patients with acute CHF, collecting blood samples at admission (T0) and clinical stability (T1).
• Measured plasma levels of C3, C4, sC5b-9, and cleaved high molecular weight kininogen.
• Stratified patients by EF and clinical outcome.

Main Results:

• Overall C3 levels significantly increased from T0 to T1.
• Patients with preserved EF showed a significant increase in C3.
• Increased C3 and sC5b-9 levels were observed in patients with a positive clinical outcome.
• CHF patients with preserved EF and positive outcomes had higher sC5b-9 levels at T1 compared to T0.

Conclusions:

• The complement system's reaction in CHF differs between preserved and reduced EF.
• These findings are significant given the distinct epidemiology, pathogenesis, and therapeutic approaches for these CHF subtypes.