Granulocyte collection by polymorphonuclear cell-targeting apheresis with medium-molecular-weight hydroxyethyl starch

Area of Science:

• Hematology
• Transfusion Medicine
• Apheresis Technology

Background:

• Granulocyte transfusion (GTX) is crucial for patients with prolonged neutropenia and severe infections.
• Efficient granulocyte collection via apheresis relies on separating granulocytes from red blood cells (RBCs).
• High-molecular-weight hydroxyethyl starch (HES) aids RBC sedimentation but may cause donor adverse effects.

Purpose of the Study:

• To evaluate the efficacy of medium-molecular-weight (MW) HES in granulocyte apheresis.
• To compare the granulocyte separation efficiency of different MW HES solutions.
• To assess the impact of donor factors, such as anemia, on collection efficiency.

Main Methods:

• In vitro experiments using whole blood to compare granulocyte-RBC separation with high-, medium-, and low-MW HES.
• Retrospective analysis of clinical data from granulocyte apheresis procedures.
• Evaluation of granulocyte yields and collection efficiency in relation to HES type and donor characteristics.

Main Results:

• Medium-MW HES demonstrated equivalent efficiency to high-MW HES in separating granulocytes from RBCs.
• Apheresis using medium-MW HES yielded sufficient granulocytes for therapeutic transfusion.
• Donor anemia was identified as a factor that reduces granulocyte collection efficiency.

Conclusions:

• Medium-MW HES is a viable and effective agent for granulocyte apheresis, comparable to high-MW HES.
• This finding supports the establishment of safer apheresis methods for granulocyte collection.
• Optimizing donor factors, like avoiding anemia, can enhance collection efficiency for granulocyte transfusion.