Transfusion-Associated Microchimerism in Previously Injured Individuals Who Received a Blood Transfusion

Retrospective Study of the Prevalence of Transfusion-Associated Microchimerism Following Traumatic Injury, Burns, and Elective Orthopedic Procedures

Status

Terminated

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT00441779

Enrollment

Registered

2007-03-01

Start date

2008-08-31

Completion date

2011-10-31

Last updated

2016-07-12

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Blood Transfusion, Chimerism, Wounds and Injuries

Keywords

Microchimerism, Injuries, Burns, Orthopedic Surgery, Leukocytes

Brief summary

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.

Detailed description

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.

Interventions

None listed

Study design

Observational model

COHORT

Time perspective

RETROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

8 Years to No maximum

Healthy volunteers

Inclusion criteria

* Hospitalized for traumatic injury, thermal injury, or an elective orthopedic surgical procedure from 2000 to 2003 at the University of California at Davis Medical Center * Received at least 1 unit of transfused red blood cells

Exclusion criteria

* Currently incarcerated * Inadequate decision-making capacity of the participant and no available surrogate decision-maker * Prior bone marrow or solid organ transplantation * Prior blood transfusion other than at the time of hospitalization * Any history of an autoimmune disorder prior to hospitalization

Design outcomes

Primary

Measure	Time frame
Microchimerism	5-11 years after transfusion

Countries

United States

Outcome results