bbts so, who really needs a transfusion? · assignment of participants to exposures by play of...
TRANSCRIPT
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BBTSWho really needs a transfusion?
Simon J StanworthConsultant Haematologist
National Health Service Blood & Transplant/Oxford University Hospitals NHS Trust;
University of Oxford
Conflicts – no financial, investigator on trials
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Talk – what are we doing?
Background What does the evidence say to support
‘liberal’ use of red cells, platelets, plasma Putting evidence into practice Pointers moving forward
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Population
Group 1
Group 2
Outcomes
Test: policy A
Standard: policy B
Randomised Controlled TrialsAssignment of participants to exposures by play of chance
Patients
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Randomised Trials Contrast observational research - examples
Interpretation: “Turn shades of grey into something closer to black and white”
Not all are good: clearer rules for appraising e.g. Cochrane methodology. Examples e.g. Age of Blood
Up to a million in medicine
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In patients undergoing cardiac surgery, transfusion of red cells that had been stored for more than 2 weeks was associated with a significantly increased risk of postoperative complications as well as reduced short-term and long-term survival
ABLE, Walsh
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Different results: Observational studies
G Murphy
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My path into clinical research
• Early exposure to epidemiology in paediatrics• Returned from New Zealand• As for paediatrics, a general dearth of evidence,
contrasted to a plethora of recommendations in guidelines.
• Guidelines on “Use of...”
Dzik
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First job plan 2005
1 To update systematic reviews, and to develop new systematic reviews
2 To drive forward a programme of clinical studies, including proposed trials of platelet prophylaxis
3 To develop new studies in conjunction with other NBS medical staff, including FFP and practice change
M Murphy, Williamson
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First Systematic reviews: FFP
Stanworth et al, Brit J of Haematology 2004, 126, 139; Update: Yang et al, Transfusion 2011
• Alongside the 2004 FFP guidelines.
• But so little quality data; no substance
• Challenging the role of recommendations in the absence of evidence
McClelland, Murphy, SRI
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The structure to this reviewWhat are the important questions?
• Fundamental: prophylaxis vs no-prophylaxis eg TOPPS. May require a higher level of scrutiny.
• Trials of different blood products (PI)
• Trials vs active interventions/ alternatives
Hyde, Brunskill
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Developing next steps/ clinical trial
systematic reviews
clinicaltrials/RCT
prospective
guidelines
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Review → Need for a trial: prophylactic vs. no-prophylactic platelet transfusions (TOPPS)
Trial question: Is a no-prophylaxis platelet transfusion policy non-inferior to (not worse than) prophylaxis for patients with haematological malignancy?
A no- prophylactic policy in patients with haematological malignancies. 2013. NEJM
NHSBT, funder; Williamson, CTU
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Timeline for TOPPS; can we improve?• Idea from SR (2005)• Grant round 1• Grant round 2• Award• Finalise Protocol• Ethics, contracts, sponsorship• Start recruitment (Other competing studies)• End recruitment• Analysis • Write-up (completed 2015)
Murphy, Norfolk, Copplestone, Wood
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More RCT’s over last 10 yearsExplosion of red cell trials:• Red cell transfusion review update - primary outcome• Use of red cells for bleeding• Age of Blood - Africa TOTAL• Neonates
Platelets: Haematology, PATCH, PlaNeT studies
But:• Plasma and cryoprecipitate: No RCTs, ISOC studies • Implementation/ Knowledge Translation
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Platelet transfusion versus standard care after acute stroke due to spontaneous cerebral haemorrhage associated with
antiplatelet therapy (PATCH)
Unexpected results for RCT’sTransfusions are biological products
Platelet transfusion seems inferior to standard care and cannot be recommended
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Multiple red cell trials: Cochrane review
Identify all randomised trialsMeta-analysis
30 trials involving 12498 patients across a diverse range of clinical settings
Carson, 2016
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Hebert et al. 1997. Am J Respir Crit Care Med
Hebert et al. 1999. NEJM 340(6)
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Mortality 30 days → Guidelines
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Limitations (outcomes and interventions)
Clinical diversity and outcomes relevant to some settings may not be adequately defined or trials under-powered
Identified trials evaluated the effect of transfusion in the hospital and not in outpatients - function and fatigue may be more important
Definitions of outcomes (e.g. cardio-vascular) - red cell transfusions have harmful and beneficial effects
Actual mean haemoglobins for transfusion in patients are often different to protocols
Haemoglobin concentration is a surrogate marker of need for transfusion
Carson, Walsh, Docherty
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Red blood cell transfusion thresholds in BMF – the need for ‘pilots’ REDDS, REAL
Feasibility RCT to evaluate protocol adherence between a restrictive (Hb 85 - 100g/L) and a liberal (maintain Hb 110-125g/L) transfusion strategy
38 patients (incl drop outs) Follow up: 18 weeks, incl 6 week
run in phase, 12 week period of intervention and follow-up
Killick, Bowen, Karakantza, Callum
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Clusters
Group 1
Group 2
Outcomes
Test: liberal strategy
Standard: restrictive strategy
AML (induction): a pilot trial of red blood cell transfusion thresholds and QoL
Morton, Sekhar (New)
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A (further) secondary analysis of CRASH2. RBC transfusion may be associated with increase in
all-cause mortality among patients with trauma and with a low predicted risk of death
PLoS Med 11(6): e1001664.
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Platelets & Plasmaand randomised trials
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The NeoBolus StudyFluid bolus therapy in neonates: A multi-centre, prospective cross-sectional studyAmy Keir (Australia), Oliver Karam (Switzerland), Cassandra Josephson
(USA), Martha Sola-Visner (US), Helen Liley (Australia), Prakesh Shah(Canada), Simon Stanworth (UK)
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Beyond haematology:Evidence-based focused review of platelet transfusions for critically ill patients with thrombocytopenia
Arnold, Heddle
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PlaNeT1: Platelet transfusions (n=415) were administered to 116 infants (69%)
Pre-transfusion median 27 x109/L (IQR: 19-36 x109/L)
PlaNeT-1 study group (UK), Pediatrics, 2009
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PlaNeT-2 trial
• Define optimal and safe platelet transfusion support for severely thrombocytopenic pre-term neonates
Compare clinical outcomes in neonates randomised to maintain plt counts at or above above either 25x109/L or 50x109/L
Curley, New, PlaNeT-2 study group (UK, Ireland), MATISSE (NL)
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Recruitment despite challenges
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Actual *Predicted (based on current accrual 11/month to 660)
PlaNeT-2 study group (UK, Ireland), MATISSE (NL)
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Use in cancer. TOPPS. Primary Outcome
WHO grade 2-4 bleeding: - no-prophylaxis: 50% (151/300) - prophylaxis: 43% (128/298)
Alternative treatments in thrombocytopeniaPBM
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Population
Group 1
Group 2
HaemostaticOutcomes
Test: tranexamic acid
Standard: placebo
TREATT: TRial to EvaluAte Tranexamic acid therapy in Thrombocytopenia
Estcourt, Wood, Others
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Should we be revisiting use of desmopressin?(DRIVE trial)
Thrombocytopenic patients undergoing invasive
procedure
Randomised
DDAVP Matching placebo
Laboratory outcomesMicrofluidics, platelet function, thrombin generation
Feasibility and Clinical outcomesBleeding, thromboembolism, serious adverse events
Desborough
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Plasma and lack of controlled trials
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Which factor is important?
Blood-exchange induced coagulopathy model
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Murine model
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• Our completed feasibility trial (46 patients, 2 civilian centres UK and military; analysis ongoing)
• Intervention group:Receive cryoprecipitate within 90 minutes of admission
• Comparator group:Receive standard massive haemorrhage protocol
Curry, Brohi, Doughty
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ConclusionWhere does the trial evidence
support the need for transfusion?
• Limited data to support effectiveness
• Life threatening bleeding (?coagulopathy – FFP, source of fibrinogen)
• Some groups - Sickle & surgery, neonates, cardiac • Platelets and some treatment plans for haematological
malignancies and thrombocytopenia
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CURRENT FEEDBACK PRACTICE
1.Audit standards based on clinical guidelines
2. Hospitals audit consecutive cases over 2-3 months
3. Feedback compared to standards/other hospitals Hospital
Transfusion Team
Grant-Casey, NCA; Lorencatto, Gould
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Why use drugs that don’t work?Lipworth et al; BMJ, 2012, 344: d286Why do clinicians prescribe rFVIIa
• Gaps in evidence• Observational association• Compelled to do something• Autonomy• Commercial
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How to respond?
GuidelinesEducation
• Group• Individual
Reminders• Computerized• Paper
Audit / FeedbackAudit / Approval
Monitoring Intervention
Tinmouth
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Audit & Feedback is an intervention
The effect of audit and feedback on professional behaviour and on patient outcomes ranges from little or no effect to a substantial effect
The quality of the evidence is low/moderate
Future studies of audit and feedback should directly compare different ways of providing feedback, and consider cost implications.
Foy, Ivers
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Applying behavioural theories to understand physicians’ transfusing practices
More rigorous methods needed to evaluate uptake of research findings & to develop theory based intervention(s) to promote improvement in transfusion
Transfusion (clinical) practice is a form of behaviourPsychology is the scientific study of behaviourPrevious studies → relevance of psychological / behaviour
change theory in understanding & changing practice
AFFINITIE first step Francis
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UK hospitals
Appropriateness of transfusionsRandomisation
Enhanced Enhanced Enhanced Feedbackcontent follow on content & as usual
follow on
Appropriateness of transfusions
Cluster trial
NCA, Foy, Everyone!
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Nature of the Interventions:
Content and Follow- up support
Audit & Feedback remains a powerful tool, but considerable scope to improve, as for all areas of implementation
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Looking ahead
Diagnostic Strategies & tests Plasma & Pro-haemostatic agents Alternatives Implementation Use of IT
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Randomised trials• Transfusion• Other areas of policy and
strategy eg more pilots
• Google: “Carrying out 12,000 RCTs every year” e.g. shades of colour on toolbars
• Capital One credit: soliciting new clients (font & colour letters)
• Casino (Harrah’s): “Don’t harass women, don’t steal and you’ve got to have a control group”
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Who? Thanks Funders – NHSBT, NIHR Resources – SRI, CTU, NCA Researchers (TOPPS, TREATT, REDDS, REAL, CRYOSTAT,
PlaNeT, DRiVe, AFFINITIE) Networks of clinicians, local research teams
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Summary: red cells
• No benefit to ‘liberal’ thresholds
• Gaps in selected clinical settings
• Lower haemoglobin thresholds?
• Better markers of the need for transfusion
• Anaemia management – use of iron
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PBM: Alternative treatments in thrombocytopenia
Desborough et al. Brit J Haem, 2016
Decreased bleeding and transfusion requirements
Increased bleeding with red cell transfusion
No improvement in bleeding or transfusion