Age of Blood in Brain Injury

September 2, 2008 updated by: University of British Columbia

A Prospective Randomized Controlled Trial Comparing the Effects of Fresh vs. Old Blood on Cerebral Oxygen Extraction in Patients With Traumatic Brain Injuries

Donated red blood cells vary in how old they are, that is, how long they have been stored since being collected from donors. Blood that has been donated is stored for a maximum of 42 days, after this time it is expired. That means that red blood cells that are given to patients as a blood transfusion can be anywhere from a few days old to 42 days old. The average age of blood that is given as a blood transfusion in this hospital is 21 days old.

As stored blood gets older its ability to carry oxygen may be reduced. Whether or not this is important in patients with a brain injury is not currently known.

The purpose of this study is to try and determine if fresh blood (less than 5 days old) is better than old blood (greater than 20 days old) in improving the supply of oxygen in patients who have suffered an injury to their brain.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

PURPOSE

To demonstrate that packed red blood cells (pRBC) less than 5 days old are superior to older (>20days) blood in improving markers of cerebral oxygenation in acutely head injured patients.

HYPOTHESIS

Transfusion of pRBC will result in increased cerebral extraction of oxygen. This effect will be greatest in pRBC stored for a greater length of time.

JUSTIFICATION

One of the main aims of the intensive management of head injured patients is the prevention of secondary hypoxic or hypotensive insults in the already injured brain. Packed red blood cell transfusions are commonly given to trauma patients suffering anemia (Hgb <100 g/l) secondary to blood loss in order to improve oxygen delivery to vital organs including the brain.

Previous studies have shown that the capacity of packed red blood cells (pRBC) to improve oxygen delivery to tissues diminishes with increased time in storage. This storage lesion may improve with time post transfusion; however, this may take many hours.

Other studies have shown an association between age of pRBCs transfused and length of stay in trauma patients and mortality in septic ICU patients. Unused old blood is likely to be sent to high volume centers to avoid wasting a precious resource.

The effects of 'old' transfused blood have not been subject to rigorous prospective studies and age of blood has not been shown to be causally related to the adverse outcomes mentioned above, hence the need for further studies.

The injured brain is uniquely sensitive to further damage. Even a brief secondary insult of either hypotension or hypoxia has been shown to have a significant adverse effect on outcomes including permanent disability and death. Furthermore the measurement of markers of cerebral oxygenation forms part of the standard care of severely head injured patients in this institution giving a unique opportunity to study the effects of blood transfusion in this group of patients.

The presence of a storage lesion in pRBCs lasting even a few hours could have a significant impact on the head injured patient. If indeed 'fresh' blood does significantly improve markers of cerebral oxygenation when compared to older blood it could alter clinical practice significantly by placing a priority on transfusing only 'fresh' blood in such patients. The effect of age of pRBCs has never been studied in the head injured population.

Donated blood is stored for a maximum of 42 days. The average age of pRBC administered at VGH is 21 days.

OBJECTIVES

To evaluate the effect of transfusing "fresh" (blood stored less than 5 days) versus "stored" (blood stored for greater than 20 days) pRBC on cerebral oxygen extraction. We will also evaluate the effect of transfusion of pRBC on cerebral oxygen extraction in patients with traumatic brain injury.

RESEARCH METHOD

This is a single centre randomized trial in severely head injured patients requiring a blood transfusion. Randomization will be by computer generated random numbers paced in sealed envelopes. Patients would be randomized to receive either blood less than 5 days old or greater than 20 days old. The decision to transfuse and all other intensive care management will be unaltered by enrolment in the study.

Study Type

Interventional

Enrollment (Anticipated)

60

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Canada
    • British Columbia
      • Vancouver, British Columbia, Canada, V5Z 1M9
        • Vancouver General Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

16 years and older (Child, Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  1. Patients with primary traumatic brain injury
  2. Glasgow Coma Scale < 8

  3. Invasive neurological monitoring:

    1. External Ventricular Drain
    2. Jugular bulb catheter
  4. Hemoglobin < 100 g/L and decision has been made by Attending Physician to treat with one unit pRBC

Exclusion Criteria:

  1. Age < 16
  2. Ongoing need for blood products
  3. Received Packed Red Blood Cells within preceding 24 hours
  4. Multiple trauma necessitating ongoing resuscitation
  5. Pregnant patients
  6. Chronic renal failure
  7. Severe sepsis or septic shock
  8. Adult respiratory distress syndrome or acute lung injury
  9. Presumed unstable neurological status during course of study
  10. Lack of informed consent

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Time Frame
To evaluate the effect of transfusing "fresh" (blood stored less than 5 days) versus "stored" (blood stored for greater than 20 days) packed red blood cells (pRBC) on cerebral oxygen extraction ratio for 24 hours post transfusion
Time Frame: 20 days
20 days

Secondary Outcome Measures

Outcome Measure
Time Frame
To evaluate the effect of transfusion of pRBC on cerebral oxygen extraction in patients with traumatic brain injury for 24 hours post transfusion.
Time Frame: 24 hours
24 hours

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of British Columbia

Investigators

  • Principal Investigator: Dean Chittock, MD, University of British Columbia

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

March 1, 2005

Primary Completion (Actual)

December 1, 2007

Study Completion (Actual)

December 1, 2007

Study Registration Dates

First Submitted

August 30, 2005

First Submitted That Met QC Criteria

August 30, 2005

First Posted (Estimate)

September 1, 2005

Study Record Updates

Last Update Posted (Estimate)

September 4, 2008

Last Update Submitted That Met QC Criteria

September 2, 2008

Last Verified

September 1, 2008

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • C04-0459
  • VCHRI #V04-0261

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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