Sub-ambient aggregometry: a tool for examining platelet storage at any temperature between 4-22 degrees C

Area of Science:

• Hematology
• Biophysics
• Biomedical Engineering

Background:

• Platelet function is crucial for hemostasis and thrombosis.
• Current methods for assessing platelet function and storage conditions have limitations.
• Understanding temperature effects on platelet behavior is vital for transfusion medicine.

Purpose of the Study:

• To evaluate platelet function across a range of temperatures (4-37°C) using a modified aggregometer.
• To assess the utility of Shear-Induced Light Transmission Change (SILTC) for monitoring platelet storage and resuscitation.
• To investigate optimal conditions for liquid platelet storage.

Main Methods:

• Utilized a modified "sub-ambient aggregometer" to measure platelet aggregation responses to ADP and spontaneous aggregation.
• Employed Shear-Induced Light Transmission Change (SILTC) as a non-invasive index of platelet morphology.
• Monitored small platelet samples during storage at 4°C and resuscitation at 37°C.

Main Results:

• Platelet aggregation responses to ADP and stirring were maximal at room temperature (approximately 22-25°C).
• SILTC measurements effectively monitored platelet storage at 4°C and subsequent resuscitation.
• The combined use of the sub-ambient aggregometer and SILTC proved useful for monitoring platelet quality during storage.

Conclusions:

• Room temperature may be optimal for routine platelet function, influencing storage protocols.
• The sub-ambient aggregometer and SILTC offer a valuable approach for defining optimal liquid platelet storage temperatures.
• Further research could redefine standard platelet storage temperatures, potentially improving stored platelet viability.