Beyond the count: platelet dysfunction profile in pediatric trauma patients.

Area of Science:

• Pediatric Trauma
• Hematology
• Microfluidics

Background:

• Existing clinical coagulation assays are inadequate for evaluating posttraumatic platelet dysfunction in children.
• Pediatric trauma patients often exhibit impaired platelet function, impacting outcomes.

Purpose of the Study:

• To elucidate changes in flow-dependent platelet function after injury in children using a microfluidic assay.
• To assess platelet deposition and function in pediatric trauma patients compared to healthy controls.

Main Methods:

• A microfluidic assay with a stenotic channel (shear rate = 3500 s⁻¹) was used to evaluate platelet function.
• Blood samples from 18 pediatric trauma patients and 10 healthy children were analyzed.
• Conventional coagulation tests, thromboelastography, and von Willebrand factor A1 domain activity were also assessed.

Main Results:

• The microfluidic assay showed significantly lower platelet deposition in trauma patients compared to controls (1.18 ± 0.25 vs 3.06 ± 0.82 MFI fold change; P < .0001).
• Thromboelastography and platelet counts were within normal limits in the trauma cohort.
• Lower platelet deposition correlated with the need for blood transfusion within 6 hours of arrival (r = -0.44, P = .048).

Conclusions:

• Posttraumatic platelet dysfunction was successfully identified using a microfluidic assay in pediatric trauma patients.
• This microfluidic approach offers a more sensitive method for assessing platelet function in pediatric trauma.
• Further research is required to understand the mechanisms and clinical significance of posttraumatic platelet dysfunction in children.