Platelet-derived microparticles and platelet function profile in children with congenital heart disease

Area of Science:

• Cardiovascular Research
• Hematology
• Pediatric Cardiology

Background:

• Platelet microparticles (PMPs) and their functional profile in pediatric congenital heart disease (CHD) remain underexplored.
• Understanding platelet behavior is crucial for managing coagulation and hemostatic abnormalities in children with CHD.

Purpose of the Study:

• To investigate platelet aggregation, surface receptor expression (P-selectin, GP IIb/IIIa), and PMP levels in children with cyanotic CHD (CCHD) and acyanotic CHD (ACHD).
• To correlate these platelet variables with hematological and coagulation parameters, including von Willebrand factor antigen (vWF Ag), in pediatric CHD patients.

Main Methods:

• Flow cytometry was used to assess platelet surface receptors and PMP levels.
• Platelet aggregation assays were performed.
• Hematological parameters (hemoglobin, hematocrit), coagulation markers (D-dimer), and vWF Ag were measured in 30 healthy controls, 30 ACHD patients, and 23 CCHD patients.

Main Results:

• Children with CCHD exhibited significantly higher hemoglobin, hematocrit (HCT), D-dimer, and vWF Ag compared to ACHD patients.
• Elevated PMP levels and P-selectin expression were observed in CHD patients versus controls, particularly in the CCHD group.
• Platelet count, aggregation, and GP IIb/IIIa expression were reduced in CCHD compared to ACHD, correlating negatively with HCT.

Conclusions:

• Increased PMP production and platelet activation, coupled with suppressed aggregation, are implicated in the pathogenesis of coagulation and hemostatic abnormalities in children with CCHD.
• These findings highlight potential therapeutic targets for managing bleeding and clotting risks in pediatric CHD.
• Further research is warranted to elucidate the precise mechanisms linking PMPs to endothelial dysfunction and coagulation disorders in CHD.