Transfusion-Associated Microchimerism in Previously Injured Individuals Who Received a Blood Transfusion
Blood transfusions are frequently necessary in situations in which there is a large amount of blood loss. In some individuals who receive a blood transfusion, white blood cells from the donor's blood may remain in the body for years, a condition known as microchimerism. This study will evaluate the occurrence of microchimerism among the following three groups of individuals who previously received transfusions: 1) individuals with traumatic injuries; 2) individuals with burn injuries; and 3) individuals who underwent elective orthopedic operations.
Wounds and Injuries
|Study Design:||Observational Model: Cohort
Time Perspective: Retrospective
|Official Title:||Retrospective Study of the Prevalence of Transfusion-Associated Microchimerism Following Traumatic Injury, Burns, and Elective Orthopedic Procedures|
- Microchimerism [ Time Frame: 5-11 years after transfusion ] [ Designated as safety issue: No ]
Biospecimen Retention: Samples With DNA
Whole blood, plasma, peripheral blood mononuclear cells
|Study Start Date:||August 2008|
|Study Completion Date:||October 2011|
|Primary Completion Date:||October 2011 (Final data collection date for primary outcome measure)|
Elective orthopedic surgery
Approximately 10% to 15% of injured patients who receive blood transfusions experience a condition known as transfusion-associated microchimerism. This occurs when white blood cells, or leukocytes, from the donor's blood persist in the recipient long after the transfusion occurs. The genetically distinct donor cells can remain in the individual for decades, and may account for as many as 4% of the white blood cells in the recipient's body. This suggests that the donor cells are tolerated by the recipient's immune system. The purpose of this study is to compare the incidence of microchimerism among individuals with three different types of injuries: 1) traumatic injuries; 2) thermal, or burn, injuries; and 3) injuries resulting from elective orthopedic surgical procedures.
In this study, blood samples will be collected from individuals who were treated for traumatic injury, thermal injury, or elective orthopedic surgical procedures at the University of California at Davis Medical Center. Individuals who were treated from 2000 to 2003 and received a blood transfusion, as well as a control group of individuals who did not receive a transfusion, will be approached to enroll in the study. Individuals who agree to participate will have their blood analyzed for evidence of microchimerism. Information on health status, injury characteristics, hospital care, blood transfusion details, and blood donor characteristics will be collected from all participants.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00441779
|United States, California|
|University of California, Davis, Medical Center|
|Sacramento, California, United States, 95817|
|Principal Investigator:||Michael P. Busch, MD, PhD||Blood Systems Research Institute|