Out with the new, in with the old - Blood · • A Positive forward group • A reverse group DP 0...

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Out with the new, in with the old: Posttransfusion group discrepancies caused by density of aged red cells Jenna Wright

Transcript of Out with the new, in with the old - Blood · • A Positive forward group • A reverse group DP 0...

Page 1: Out with the new, in with the old - Blood · • A Positive forward group • A reverse group DP 0 4+ 0 0 4+ Grouping Discrepancy. ... Storage lesion: role of red blood cell breakdown.

Out with the new, in with the old: Post‐transfusion group discrepancies caused by 

density of aged red cells

Jenna Wright

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A B D Ctrl A‐cells B‐cells

0 0 0 0 0 4+

AUTOMATED PIPETTING• ORTHO AutoVue®• O Negative forward group• A reverse group

Grouping Discrepancy

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A B D Ctrl A‐cells B‐cells

MANUAL PIPETTING• ORTHO BioVue® System Cassettes

• A Positive forward group• A reverse group

DP 0 4+ 0 0 4+

Grouping Discrepancy

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Red Cell Life Cycle

• Survive in the circulation for ~115 days (±15%)

• Red cell senescence:↓ Enzyme ac vity↓ Cell Deformability

↓ Size∆ Shape

• Eryptosis by macrophages in the spleen and liver

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Density

+

• Pre‐analytical separation by centrifugation

• Based on density gradient/ specific gravity

Blood Fractionation

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• Biochemically supported• SAGM

Saline (NaCl): Isotonicity Adenine: ATP for cell viability Glucose: Nutrition Mannitol: reduces red cell lysis

• Storage• Up to 42 days• Refrigerated at 2‐6C

• Continue to age/ storage lesions• Red cell membrane loss

Red Cell Packs

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O Negative

A+

A Positive

Density Gradient

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Scenarios

TRAUMA

APLASTIC ANAEMIA 

↓Autologous cells• Aplastic Anaemia• Thalassaemia• Cytopenia• Major Trauma

↑ Donor Cells• Transfusion dependant• MTP

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• AABB (American Association of Blood Banks) (2014). Transfusion Manual. 18th Edition; Method 2‐22; pp.1‐2.

• Franco, R. (2012). Measurement of Red Cell Lifespan and Aging. Transfusion Medicine and Hemotherapy, 39(5), pp.302‐307.

• Kim‐Shapiro, D., Lee, J. and Gladwin, M. (2011). Storage lesion: role of red blood cell breakdown. Transfusion, 51(4), pp.844‐851.

• Ortho Clinical Diagnostics (2017). Important Product Notification. Visual Reference Guide For ORTHO BioVue System Cassettes. [online] Johnson and Johnson, pp.1‐5. Available at: http://www.hsa.gov.sg/content/dam/HSA/HPRG/Medical_Devices/Updates_and_Safety_reporting/Field_Safety_Corrective_Action.pdf [Accessed 10 Oct. 2017].

Thank you!

Further Reading