Improved method for automated red cell exchange in sickle cell disease.

Area of Science:

• Hematology
• Medical Devices
• Biotechnology

Background:

• Sickle cell disease (SCD) is a genetic blood disorder characterized by abnormal hemoglobin.
• Erythrocytapheresis is a treatment to remove sickle red blood cells.
• Standard red cell exchange procedures can face complications like sickle cell clumping.

Purpose of the Study:

• To introduce an improved intermittent-flow erythrocytapheresis method for SCD.
• To address and mitigate the complication of sickle erythrocyte clumping in the Haemonetics 30S unit.
• To enhance the efficiency and potential benefits of red cell exchange therapy in SCD patients.

Main Methods:

• Modification of the standard red cell exchange procedure for the Haemonetics 30S unit.
• Dilution of patient blood with physiologic saline (approx. 1.6:1 saline to blood ratio) during the initial passes.
• Controlled return of saline-diluted plasma to maintain extracorporeal volume below 500 ml.

Main Results:

• Significantly reduced clumping of sickle erythrocytes in the centrifugation bowl.
• Elimination of the need to change the centrifugation bowl between passes.
• Successful collection and cryopreservation of sickle red blood cells from the first pass for potential future use.

Conclusions:

• The improved method effectively prevents sickle cell clumping during erythrocytapheresis.
• This technique enhances the operational efficiency of red cell exchange for SCD.
• Cryopreservation of collected sickle red cells offers a novel option for autotransfusion or further therapeutic applications.