Impact of Microparticles in Blood on Transfused Patient Outcomes

Study Overview
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Brief Summary
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During storage, red blood cells (RBCs) undergo changes collectively termed Storage lesions. these changes may have an impact of the outcomes of transfused patients. One of these changes is the release of microparticles by RBCs and other blood cells types. The aim of the study is to (1) quantify red cell- and platelet-derived microparticles in RBC concentrates, and (2) evaluate the impact of transfused microparticles (MPs) on survival and post-transfusion complications in critical care patients participating in the ABLE trial (ISRCTN44878718).

Detailed Description
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During conservation of red blood cell concentrates, red blood cells (RBCs) undergo biochemical and morphological changes that have been well described, and are collectively termed  storage lesions . The exact effects of these lesions in terms of beneficial or deleterious implications in the recipient remain to be elucidated. However, several retrospective studies in targeted populations suggest that an increase in the duration of RBC conservation could lead to an increase in morbidity and mortality in transfused patients. The multicenter, prospective trial ABLE (Age of Blood Evaluation, ISRCTN44878718) aimed to evaluate in a randomised clinical trial, the impact of the age of transfused RBC concentrates on several outcomes in critical care patients. Among the modifications that RBCs undergo during storage, the generation of microparticles from red blood cellsRBCs or residual platelets present in the blood concentrate has never been evaluated in a prospective clinical study. It has been reported that the number of red cell-derived microparticles (RMPs) present in stored blood increases with storage duration. In vivo, microparticles MPs appear to be increasingly involved in disease processes, notably due to their pro-inflammatory and pro-coagulant effects. Furthermore, it has been shown that the antigens of the Rhesus group are expressed on the RBC derived microparticles, and the investigative team has shown that microparticles derived from elsewhere (endothelial cells) are capable of activating cells which are important in the induction of immune responses (dendritic cells). Thus, transfusing red blood cell derived microparticles could participate in post-transfusional alloimmunization which may also be evaluated in this study. The aim of the IMIB study is to (1) quantify red cell- and platelet-derived microparticles MPs in RBC concentrates, and (2) evaluate the impact of the quantity of transfused microparticles (MPs) on survival and several outcomes in the patients enrolled in the ABLE trial in France. Other aims are to investigate the relationship between the number of microparticles in RBC units and (1) the age of RBC, (2) donors characteristics, (3) the procedures used to prepare the blood products (to define a potential new lesion storage marker).

Official Title
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Cell-derived Microparticles in Red Blood Cell (RBC) Concentrates, and Their Potential Impact on Outcomes of Transfused Patients in Critical Care: a Prospective Multicentre National Cohort Study of Patients Included in the ABLE Trial

Conditions
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Critical Care

Intervention / Treatment
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* Procedure: Red Blood Cell transfusion
* Procedure: Microparticles quantification


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria are those of the ABLE trial: patients who Have had a request for a first red cell unit transfusion in the Intensive Care Unit (ICU), and Have an anticipated length of invasive and/or non-invasive continuous positive airway pressure (CPAP) or bi-level positive airway pressure (BIPAP) mechanical ventilation of at least 48 hours once enrolled, as estimated by the attending physician Exclusion Criteria: less than 18 years of age previously enrolled in the ABLE study has already been transfused with red cells during the current hospitalisation has an obvious terminal illness documented in the medical record with a life expectancy of less than 3 months has undergone routine cardiac surgical care decision to withdraw/withhold some critical care had been made brain dead no red cells with a storage time of 7 days or less available in the blood bank that cannot be transported from the blood supplier Who require more than 1 unit of uncross-matched red cells With a known objection to blood transfusions With autologous blood donations Who pose difficulties in securing blood products (rare blood groups), and who are difficult to match

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Transfused critical care patients<br>Patients included in the Age of BLood Evaluation (ABLE) trial in either arms and included in a French center. | Procedure: Red Blood Cell transfusion<br> <br> Procedure: Microparticles quantification<br>* Flow cytometric quantification of microparticles in transfused blood<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| All cause mortality |  | 90 days | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| All cause mortality |  | 28 days, 6 months | 
| Multi organ dysfunction score |  | 6 months | 
| Nosocomial infection | including Nosocomial pneumonia, Deep tissue infections (e.g. peritonitis, mediastinitis), Bacteraemia from organisms not considered normal skin flora and judged important enough to treat by the attending team, as measured while in the ICU | 6 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Red Blood Cell Transfusion, Cell-Derived Microparticles