P rogram to R educe O rthopedic B lood E xposure Dr. Brian Feagan London Health Sciences Centre Robarts Research Institute, Robarts Clinical Trials.

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Presentation transcript:

P rogram to R educe O rthopedic B lood E xposure Dr. Brian Feagan London Health Sciences Centre Robarts Research Institute, Robarts Clinical Trials

PROBE Program to Reduce Orthopedic Blood Exposure The Development and Evaluation of a Blood Conservation Algorithm in Patients Undergoing Elective Primary Total Hip Joint Arthroplasty (THJA) Sponsor: Ontario Ministry of Health and Long-Term Care Blood Conservation and Bloodless Medicine Program Steering Committee: Brian Feagan (Chair), Cindy Wong, Peggy Vandervoort, Keyvan Karkouti, John Freedman, Steven MacDonald, David Reeleder (ex officio from MOH)

Total Hip Joint Arthroplasty Common 9,314 hip operations in Ontario in 2003 Highly effective, good value to society Performed in an elderly population at risk for complications of IHD

The Problem Blood loss is common with THJA Consequences: Symptoms - fatigue, dizziness, shortness of breath, muscle weakness - increased risk of complications of IHD - poor mobilization, compliance with physiotherapy Transfusion of allogeneic blood is common

Autologous Blood Donation (ABD) Most widely used strategy Patients predonate 2-3 units of blood before surgery Reinfused if needed Use restricted - Hgb > no major CV problems - age < 80 years - weight > 25 kg ~ 60% of population eligible

Perioperative Recombinant Erythropoietin COPES II: Transfusion Rates % Transfused P=0.003 P= % 22.8% 11.4% Feagan BG et al. Annals of Internal Medicine. 2000;133:

The Krever Commission 1997: Some Key Recommendations The transfusion of ones own blood (autologous transfusion) is safer than the transfusion of blood components made from the donations of other persons (allogeneic transfusion). The operator of the blood supply system should be fully informed of the risks and benefits of alternative therapies and promote their appropriate use.

Transfusion Practice in Orthopedic Surgery Chart Review Study

* Eligibility according to CBS criteria Transfusion Practice in Orthopedic Surgery Chart Review Study # of hospitals 19 # of patients 4,535 ABD participation 19% Eligible for ABD* 58% % of eligible patients that had ABD 33% Allogeneic transfusion rate for ABD 14% Allogeneic transfusion for no ABD 30% Allogeneic transfusion for no ABD 46% (Hemoglobin 130 g/L) Feagan BG et al. Transfusion Medicine 2001;11:87-95

Transfusion Practice in Orthopedic Surgery Chart Review Study Conclusions The proportion of patients ineligible for ABD is high: 42% ABD participation remains suboptimal: only 33% eligible for ABD participated in a program Allogeneic transfusion rate in 1 THJA is high: 30% overall This risk is higher in patients with low baseline [Hgb]: 46% in patients with baseline [Hgb] 130 g/L Use of other blood conservation techniques other than ABD is virtually non-existent If allogeneic transfusion rates are to decrease, use of both ABD and other conservation technologies must be enhanced through an integrated approach Feagan BG et al. Transfusion Medicine 2001;11:87-95

PROBE The objective is to determine whether use of a comprehensive blood conservation algorithm is more effective than usual care for reducing exposure to allogeneic blood in patients undergoing primary THJA at hospitals in Ontario.

Overview Part II Part III BCA Blood Conservation Algorithm (BCA) (Education/ABD/EPO/Practice Guidelines) Retrospective Data 30 Hospitals Pilot BCA Review of Literature Usual Care Part I 15 Sites 60 Patients (THJA) 15 Sites 60 Patients (THJA)

Part I: Collect Background Data Retrospective review of 37 Ontario hospitals: Audit of medical records (2000/05/01 – 2001/04/30) to obtain: number of primary THJA performed patients demographics pre and post [Hgb] use of blood conservation strategies ABD eligibility status transfusion blood loss anemia related complications LOS Completed in 9 months Total # of unique charts audited = 4,260 Data were used to plan Part III

% Hospital Part I Chart Review Institutional Mean = 23.1%

% Hospital Part I Chart Review Institutional Mean = 26.7%

Part I Chart Review Observations: 5 of 37 sites with overall allogeneic rate < 10% Potential to bring allogeneic rate below 10%? Confirmed feasibility of Part III RCT Institutions vary greatly Consensus-based BCA needs to be adapted to local environment

Part III: Implementation & Evaluation of BCA Eligibility Criteria: Minimum of 60 elective primary THJA performed annually No existing comprehensive BCA Willing to be randomized Modified Criteria: Overall allogenic rate >= 10% Included 3 sites which performed < 60 cases in Part 1

Part III: Implementation & Evaluation of BCA Primary outcome: allogeneic transfusion rate Secondary outcomes: use of blood conservation strategies autologous transfusion pre- and post operative [Hgb] surgical blood loss LOS anemia-related complications patient/provider satisfaction (survey) cost & effectiveness Each hospital to provide data for approxinately 60 consecutive cases

Randomization: Cluster randomization 1:1 ratio to BCA or usual care Minimization procedure to balance: number of 1 THJAs performed allogeneic transfusion rate ABD rate Part III: Implementation & Evaluation of BCA Based on data obtained in Part I

PROBE BLOOD CONSERVATION ALGORITHM FOR ELECTIVE PRIMARY THJA PATIENTS Surgeons Office Patient Education Pre-Admission Clinic Patient Education Hgb > Start Niferex EPO 40,000u x 4 EPO 40,000u x 3 EPO 40,000u x 2 No EPO therapy Hgb > Start Niferex ABD 2 units ABD 1 unit No ABD Hgb >150 No Blood Conservation Strategies OR / Post-op Transfusion Hgb < 70 - transfusion likely appropriate Guidelines:Hgb transfusion likely appropriate if patient symptomatic Hgb > transfusion likely inappropriate Provider Education Materials Patient Education Materials Pre-op Duration >4 weeks to OR 3-<4 weeks to OR 2-<3 weeks to OR <2 weeks to OR Hgb <=100 Consider Delaying Surgery Pre-Op Period Insufficient time for pre-op intervention: Select patient likely with Hgb > 150

Part I 37 Part III 30 5 allogeneic rate <10% 1 withdrew consent 2 merged UC 15 BCA 15 Implemented 14 Withdrew consent 1 Disposition of Institutions

Part III Allogeneic Transfusion Rate (Institutional Level Summary): = 9.6 (p = 0.02) BCAUsual Care

% Part III Usual CareBCA Allogeneic Transfusion Rate * * Part I allogeneic transfusion rates are displayed in the background.

% Part III Usual CareBCA EPO / ABD Participation Rate * * Part I EPO / ABD participation rates are displayed in the background.

Part III Blood Conservation Technique and Allogeneic Transfusion by Baseline [Hgb] % Usual Care BCA

Part III Length of Hospital Stay*: Institutional Summary Usual Care BCA (N = 15) (N = 14) Mean (Range) Mean (Range) Adm to D/C 6.4 (4.1 – 9.2) 5.8 (2.4 – 8.6) Sx to D/C 6.3 (4.0 – 9.2) 5.8 (2.4 – 8.1) * Number of nights in hospital

Part III Major Complications: Usual Care BCA # Pts (% overall) # Pts (% overall) Institutional Range Institutional Range In Hospital Death 3 (0.3%) 1 (0.1%) 0 – 1.7% 0 – 1.7% Stroke 2 (0.2%) 1 (0.1%) 0 – 1.7% 0 – 1.6% MI 7 (0.8%) 9 (0.8%) 0 – 1.7% 0 – 3.6% Death/Stroke/MI 11 (1.2%) 10 (0.9%) 0 – 3.3% 0 – 3.6%

PROBE: Conclusions Blood conservation algorithm is effective (~10% ARR) Evidence exists that individual key components (ABD, EPO, practice guidelines) were effective Largest impact is in patients at highest risk of requiring allogeneic transfusion (i.e. patients with [Hgb] g/L) Some institutions are non-responders – Why? Most efficient in institutions with high baseline allogeneic rates

P R O B E Benefits to Ontario Expect decrease in use of allogeneic transfusion & more rational use of autologous blood Comprehensive analysis from a controlled study will estimate the cost-effectiveness of an integrated blood conservation program Heighten awareness of blood conservation among members of the public and providers MOH has provided strong leadership in attempt to resolving discrepancy between Krever recommendation and current practice in Ontario