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MEDICAL WORKING GROUP – DONOR SUITABILITY 30 May 2016 Spring meeting – Singapore Chair: H Yang
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Committee business Co-chair: Continuity Clerical support Access to comprehensive national HPC donor suitability guidelines and/or related field Attends WMDA Fall meetings/EBMT
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Zika & other arboviruses Zika, dengue, chikungunya and West Nile virus - while distinct and varied in clinical manifestation - share important similarities in risk assessment: Can we use a common framework in assessing “geographical” risk? What about local/ongoing risk vs past/travel risk? For Zika only – what about sexual contact with exposed males? With symptoms Without symptoms
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Arbovirus commonalities
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Zika + dengue/CHIKV/WNV/malaria
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Arbovirus common framework At enrolment – accept At verification typing – notify TC of exposure type and timing: Past travel vs ongoing residence Sexual contact (Zika only) At work-up – test RNA outside 14 days where possible; notify TC
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Zika virus sexual contact Sexual contact with a male who has been exposed to Zika virus risk: Male with symptoms – notify TC; use condoms; test for RNA outside 14 days where possible. Male without symptoms – as above? Duration of risk – 3 months to cover 66–70 day case reports, or 6 months to comply with FDA? Australian risk modelling – sexual contact question not warranted for blood donors, as risk is conservatively <1 in 9 million (Feb 2016).
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Australian risk modelling Assumptions: 1 in 319 male partner infection rate + 1.78% travel exposure + 100% sexual contact rate + 10% infection rate 1 in 180,000 female donor infection rate 780,000 WB collections/year + 50% female donors + 7- day viraemia + 0% effectiveness of general deferrals 1 in 9 million risk of collecting an infected WB donation 100% transfusion transmission + 0% immunity + 80% asymptomatic recipient infections 1 in 47 million risk of symptomatic recipient infections 1% obstetric use + 50% severe foetal outcomes 1 in 1,874 million risk of severe foetal outcomes
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Splenomegaly How big is too big? Palpation Ultrasound Other? Underlying cause – what if unknown?
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Diabetes mellitus Current guidance: Individual at risk – donor At recruitment – unacceptable At CT/WU – accept if type 2 controlled with diet or oral Rx + no complications Justification - “…more likely to be medically deferred if eventually called to donate several years later.”
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Type 2 diabetes mellitus Is exclusion at enrolment stage warranted? Increasing type 2 diabetes in Australia, USA, etc Decreasing age of onset Highest risk among people with Asia/Pacific and African ethnicity Could this limit ethnic diversity?
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Asthma Is specialist assessment necessary? Would an assessment protocol be useful? Recommendation of medical supervision of first-dose G-CSF – what is our actual experience?
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Transgender donors HIV risk in transwomen (MTF)? HIV risk in transmen (FTM)? Pre-surgery vs post-surgery How to document donor sex? “Agender” individuals (non-binary sex paradigm)
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Case studies 1.MVA 4 yrs ago leg #s Rx IF; still in situ 2.Regular plasmapheresis blood donor for rabies Ig rabies vaccine every 3 months 3.MBA 8 yrs ago neurosurgery visual deficit & “impending blindness” 4.MVA 18 yrs ago # femur Rx IF plate removed but now 7 cm diff leg length & minor back pain
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More case studies 4.39F with 7/12 hx of ?asthma cough Rx Symbicort; Singulair now well- controlled with normal CXR and PEF; PBSC requested 5.PHx asthma; MBA 7 yrs ago skull # without LoC 12-month hx of recurrent headaches associated with torticollis & ?nerve entrapment. Episodes every 2/12 respond to paracetamol.
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Other business
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