Assessment of Whole Blood Cold Stored Platelets
| Status: | Completed |
|---|---|
| Conditions: | Healthy Studies |
| Therapuetic Areas: | Other |
| Healthy: | No |
| Age Range: | 18 - Any |
| Updated: | 8/5/2017 |
| Start Date: | October 2013 |
| End Date: | March 2015 |
The purpose of this study is to determine the life span and functional characteristics of
platelets derived from whole blood that has been stored in a refrigerator for up to 21 days.
Currently, platelets are separated from red cells shortly after donation and stored at room
temperature for no longer than 5 days. This study is considered experimental because; 1) we
will be keeping platelets in the original whole blood donor unit in the refrigerator, and 2)
we will be reinfusing a small portion of that donation back into the study-subject-donor and
tracking how many of the transfused platelets from that unit circulate in the
study-subject-donor in the hours and days after transfusion.
platelets derived from whole blood that has been stored in a refrigerator for up to 21 days.
Currently, platelets are separated from red cells shortly after donation and stored at room
temperature for no longer than 5 days. This study is considered experimental because; 1) we
will be keeping platelets in the original whole blood donor unit in the refrigerator, and 2)
we will be reinfusing a small portion of that donation back into the study-subject-donor and
tracking how many of the transfused platelets from that unit circulate in the
study-subject-donor in the hours and days after transfusion.
Subjects will be enrolled for evaluation of platelet recovery and survival. Healthy subjects
will be consented and enrolled into the study until 8 subjects have completed the recovery
and survival evaluations at 4, 8, 12, 16, and 20 days storage. The order in which storage
intervals are evaluated will be randomized. Eight subjects will then be evaluated at the
mid-range interval between longest storage period that meets acceptances criteria and
shortest storage period that does not meet acceptance criteria. For instance, if at 12 days
of storage the 95% lower confidence limits for recoveries are NOT ≥50% of fresh and survivals
are LESS than one day, but at 8 days of storage recoveries are ≥50% of fresh and survivals
are at least than one day, we will then evaluate 10 days of storage. If the 10 day storage
does not meet acceptance criteria we will evaluate 9 days. If the 10 day storage does meet
acceptance criteria we will evaluate 11 days. Eight subjects will be evaluated at each
storage interval.
Subjects will donate one unit of whole blood. This unit will be maintained as whole blood in
CPD (Citrate Phosphate Dextrose anticoagulant) not leukoreduced and not separated into
components. These WB units will be stored under refrigerated conditions (4°C) for between 4
and 20 days after collection. Prior to refrigeration samples from the unit will be obtained
for various in vitro tests.
In vivo Measurements:
At the end of each subject's storage period a ~200 mL aliquot of whole blood will be
withdrawn from the unit. This aliquot will be centrifuged and the platelets extracted. The
platelets will be radiolabeled with 51-Cr or 111-In. On that day, the subject will return to
the Blood Center and provide a 43 mL fresh blood sample. Platelets from that sample will be
harvested and labeled with the other isotope. Radiolabeling will be done by the BEST method.
These aliquots will be sequentially infused into the subject. The estimated amount of the
isotope is ≤15 μCi of indium and ≤20 μCi of chromium will be infused. The total radiation
dose is approximately 40 μCi for a total body absorbed dose of 0.0273 rad (0.273 mSv) and a
splenic absorbed dose of 3.2 rad (32 mSv). Venous samples (10 mls/draw) will be taken within
2 hours after reinfusion and on days 1, 2, 3, 5, 7 ± 1, and 10 ± 2. After these visits, the
subject's participation will end and they will exit the study. Stored and fresh platelet
recoveries and survivals will be determined and comparisons will be made between each
subject's fresh and stored platelet recoveries.
In vitro Assays:
The following assays will be performed using a 50 ml sample obtained from the whole blood pre
and post storage:
- platelet count
- platelet function assays (mean platelet volume, morphology score, hypotonic shock
response, extent of shape change, pH, PO2, PC02, HC03, glucose and lactate. Platelet
aggregation response to standard agonists (ADP, collagen, arachidonic acid) will also be
measured.
- platelet activation and apoptotic markers (p-selectin antigen, annexin V, platelet
microparticles)
- thrombelastograph
- thrombin generation test
- plasma analysis of coagulation, complement, microparticles and fibrinolytic potential
(thrombin-antithrombin complex (TAT), plasmin-antiplasmin complex (PAP), soluble cd 40l,
plasminogen activator inhibitor (PAI-1 ), complement (C3a, C4d, C5b-9)
- sterility - bacterial cultures will be submitted after collection and the results
evaluated 14 days later, or sooner if blood is stored for a shorter time period. A gram
stain will be performed on the isolated 4° C platelets before reinfusion at the end of
storage. All sterility tests must be negative before test platelets will be reinfused.
will be consented and enrolled into the study until 8 subjects have completed the recovery
and survival evaluations at 4, 8, 12, 16, and 20 days storage. The order in which storage
intervals are evaluated will be randomized. Eight subjects will then be evaluated at the
mid-range interval between longest storage period that meets acceptances criteria and
shortest storage period that does not meet acceptance criteria. For instance, if at 12 days
of storage the 95% lower confidence limits for recoveries are NOT ≥50% of fresh and survivals
are LESS than one day, but at 8 days of storage recoveries are ≥50% of fresh and survivals
are at least than one day, we will then evaluate 10 days of storage. If the 10 day storage
does not meet acceptance criteria we will evaluate 9 days. If the 10 day storage does meet
acceptance criteria we will evaluate 11 days. Eight subjects will be evaluated at each
storage interval.
Subjects will donate one unit of whole blood. This unit will be maintained as whole blood in
CPD (Citrate Phosphate Dextrose anticoagulant) not leukoreduced and not separated into
components. These WB units will be stored under refrigerated conditions (4°C) for between 4
and 20 days after collection. Prior to refrigeration samples from the unit will be obtained
for various in vitro tests.
In vivo Measurements:
At the end of each subject's storage period a ~200 mL aliquot of whole blood will be
withdrawn from the unit. This aliquot will be centrifuged and the platelets extracted. The
platelets will be radiolabeled with 51-Cr or 111-In. On that day, the subject will return to
the Blood Center and provide a 43 mL fresh blood sample. Platelets from that sample will be
harvested and labeled with the other isotope. Radiolabeling will be done by the BEST method.
These aliquots will be sequentially infused into the subject. The estimated amount of the
isotope is ≤15 μCi of indium and ≤20 μCi of chromium will be infused. The total radiation
dose is approximately 40 μCi for a total body absorbed dose of 0.0273 rad (0.273 mSv) and a
splenic absorbed dose of 3.2 rad (32 mSv). Venous samples (10 mls/draw) will be taken within
2 hours after reinfusion and on days 1, 2, 3, 5, 7 ± 1, and 10 ± 2. After these visits, the
subject's participation will end and they will exit the study. Stored and fresh platelet
recoveries and survivals will be determined and comparisons will be made between each
subject's fresh and stored platelet recoveries.
In vitro Assays:
The following assays will be performed using a 50 ml sample obtained from the whole blood pre
and post storage:
- platelet count
- platelet function assays (mean platelet volume, morphology score, hypotonic shock
response, extent of shape change, pH, PO2, PC02, HC03, glucose and lactate. Platelet
aggregation response to standard agonists (ADP, collagen, arachidonic acid) will also be
measured.
- platelet activation and apoptotic markers (p-selectin antigen, annexin V, platelet
microparticles)
- thrombelastograph
- thrombin generation test
- plasma analysis of coagulation, complement, microparticles and fibrinolytic potential
(thrombin-antithrombin complex (TAT), plasmin-antiplasmin complex (PAP), soluble cd 40l,
plasminogen activator inhibitor (PAI-1 ), complement (C3a, C4d, C5b-9)
- sterility - bacterial cultures will be submitted after collection and the results
evaluated 14 days later, or sooner if blood is stored for a shorter time period. A gram
stain will be performed on the isolated 4° C platelets before reinfusion at the end of
storage. All sterility tests must be negative before test platelets will be reinfused.
Inclusion Criteria:
- The subject is in good health, is taking no excluded medications, and satisfies the
Blood Center's criteria to donate blood products. Criteria will also include the
following guidelines:
- Meets whole blood/platelet donor suitability requirements as defined in 21 CFR 640.3
and set forth by the AABB (Reference Standard 5.4.1A, 2006). Past travel restrictions
do not apply for this study.
- Weight ≥50 kg (110 pounds)
- Hemoglobin/hematocrit: ≥12.5 g/dL/38%
- Temperature: less than or equal to 37.5 degrees C
- Resting blood pressure: systolic less than or equal 180 mmHg; diastolic ≥100 mmHg
- Resting heart rate: 50 to 100 beats per minute
- Age ≥ 18 years, of either sex;
- Able to read, understand and sign the informed consent document and commit to the
study follow-up schedule;
- Subjects must have good veins for whole blood collection and follow-up blood draws;
- Subjects of child-bearing potential must agree to use an effective contraceptive
during the course of the study;
- Those subjects who will be reinfused within 10 days of their 500 mL WB collection must
meet the criteria for donating a double RBC unit to accommodate the sampling volume
that will occur shortly thereafter:
- Male subjects must weigh a minimum of 130 lbs and be at least 5'1" tall
- Female subjects must weigh a minimum of 150 lbs and be at least 5'5" tall
- Both male and female subjects must have a Hematocrit of ≥ 40%;
Exclusion Criteria:
- Any serious medical illness and/or therapy, including: abnormal bleeding episodes,
clotting or bleeding disorder, evidence of anemia, myocardial infarction, uncontrolled
hypertension, heart disease, surgery with bleeding complications, epilepsy or any
major surgery (with general or spinal anesthesia) within the last 6 months;
- Taking aspirin, Alka-Seltzer™, clopidogrel, or other "anti-platelet" drugs within 7
days prior to donation.
- Taking any nonsteroidal anti-inflammatory drug (for example: Motrin™, Advil™, or
ibuprofen) within 3 days prior to donation.
- Taking any anticoagulant medications (for example Coumadin, dabigatran, rivaroxaban or
any medications chemically related to heparin).
- Currently pregnant or nursing within the 6 weeks prior to enrollment as assessed
during interview. Current status is confirmed by pregnancy test prior to radioisotope
infusion.
- Inability to comply with the protocol in the opinion of the investigator.
- Participation in another investigational trial that would potentially interfere with
the analysis of this investigation (e.g., pharmaceutical);
- Have participated in ≥ 4 research studies involving radioisotopes within the last 12
months.
We found this trial at
1
site
Click here to add this to my saved trials
