Primary hemostasis after massive transfusion for injury

Area of Science:

• Transfusion Medicine
• Hematology
• Trauma Surgery

Background:

• Primary hemostasis, crucial for controlling bleeding, relies on platelet plug formation.
• Massive transfusions are often required to manage bleeding in severely injured patients.
• The impact of stored blood transfusions on platelet function and bleeding time is not fully understood.

Purpose of the Study:

• To investigate platelet counts (PLT) and bleeding time (BT) in injured patients undergoing massive transfusions.
• To correlate PLT and BT levels with transfusion volume and storage duration of transfused blood.
• To assess the potential protective role of transfusion-induced platelet dysfunction against disseminated intravascular coagulation (DIC).

Main Methods:

• Prospective study of 22 injured patients receiving an average of 21 transfusions.
• Serial measurements of PLT and BT intraoperatively and postoperatively (6h, 25h, day 2, day 4, convalescence).
• Correlation analysis between PLT/BT and transfusion parameters (number, storage age).

Main Results:

• Intraoperative PLT dropped to 109,000/mm3 with BT > 15 minutes.
• Postoperative PLT significantly decreased to 73,000/mm3 at 15 hours and 76,000/mm3 on day 2.
• PLT normalized by day 4 (110,000/mm3) and became supernormal during convalescence.
• BT remained prolonged until day 4, normalizing during convalescence.
• Thrombocytopenia and prolonged BT did not correlate with transfusion number or blood storage age.

Conclusions:

• Massive transfusion in injured patients leads to significant thrombocytopenia and prolonged bleeding time, indicative of platelet dysfunction.
• This platelet dysfunction may serve a protective role against the development of disseminated intravascular coagulation.
• Intervention for thrombocytopenia should be reserved for actively bleeding patients.