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Transplant of marginal/NHBD kidneys and outcomes: kidney

Transplant of marginal/NHBD kidneys and outcomes: kidney. David Talbot. The increasing use of NHBD kidneys. DBD and DCD kidney transplants by centre, 2008/2009 financial year. DBD. DCD. Kidney transplant outcomes for DBD/DCD donors. Patient survival. Graft survival.

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Transplant of marginal/NHBD kidneys and outcomes: kidney

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  1. Transplant of marginal/NHBD kidneys and outcomes: kidney David Talbot

  2. The increasing use of NHBD kidneys

  3. DBD and DCD kidney transplants by centre, 2008/2009 financial year

  4. DBD DCD Kidney transplant outcomes for DBD/DCD donors Patient survival Graft survival

  5. Standard and Expanded Criteria donors: • Standard donor: donors 10-39yrs, no hypertension, no CVA, terminal serum creatinine< 133μmol/l • Expanded donor: >60 or 50-60 + 2 of the above (producing a relative risk >1.7) (Am J Trans 2002; 2:1. Transplantation 2002; 74:1281. Am J T 2003; 3:114. Ann Surg 2004; 239: 688.) • Where does DCD/NHBD lie in relation ship to expanded versus standard donors?

  6. UNOS data: 2562 DCD • 62,800 Standard criteria(<50) • 12,812 Expanded Criteria donor

  7. Standard versus expanded versus DCD:

  8. Unified donor retrieval teams from 1st April with a desire to share NHBD kidneys (NHS BT) Unification means that there is a need for consensus: • How long do we wait after withdrawal of support? • Should we use an Apnoea score? • Machine versus static cold storage? • Is prolonged cold ischaemia safe for DCD/NHBD kidneys? • Which kidneys can be shared?

  9. How long to wait after withdrawal?

  10. New England Organ bank: Oct 99-April 06143 kidneys39 livers*Small numbers, best donors, short time between extubation and death but suggestion that primary function in kidneys better if hypotensive period is short: (confirmed with composite end points of the liver) though no difference to long term outcome for the kidney*NB Dominic Summers GFR DCD versus DBD equivalent though higher at 3/12

  11. Newcastle team call outs in 2004-6

  12. Wisconsin Apnoea Score: • Chapter 15 Donors without a heart beat in the US- Anthony D’Alessandro from Organ donation and transplantation after cardiac death (DT/ADA ISBN 978-0-19-921733-5)

  13. Wisconsin Apnoea score: • 8-12: High risk of continuing to breathe after extubation • 13-18 Moderate risk for continuing to breathe after extubation • 19-24 Low risk for continuing to breathe after extubation • 84.3% accurate of death within 2 hours • Wisconsin sends a team if score >12

  14. ?Evaluate a UK score

  15. Risk of continuing to breath on withdrawal • High risk: Tracheostomy, no inotropes, young, thin, spontaneous breathing -4 • Moderate risk: bmi 25-29, single inotrope,31-50 years of age, intubated, spontaneous breathing- 9 • Low risk 1: High bmi, multiple inotropes, 51+, endotracheal tube, no spontaneous breathing- 21 • Or Low risk: High BMI, 51+, no inotropes, CPAP- 16

  16. Machine versus static storage Is machine perfusion with GST etc needed for viability assessment? Is machine perfusion better than static storage for marginal kidneys? Does machine perfusion confer some benefit when kidneys are exchanged?

  17. Newcastle NHBD Donor numbers 1999-2002

  18. Vijayanand collected data on MIII renal transplants 2002-6: SCS=Bristol, HMP= Ncl Newcastle versus Bristol NHBD MIII- BTS 2007

  19. Bristol versus Newcastle

  20. UK outcome machine versus cold. Units that ‘do’ versus units that don’t. Censoring out those involved in UK MPS/static storage Others Oxford/Plym/New p = 0.39 (logrank) Dominic Summers NHS BT 2010

  21. Machine Perfusion or Cold Storage in Deceased-Donor Kidney Transplantation • Cyril Moers, Jacqueline M Smits, Mark-Hugo J Maathuis, Jurgen Treckmann, et al. The New England Journal of Medicine. Boston: Jan 1, 2009. Vol. 360, Iss. 1; pg. 7

  22. The Blue kidney at retrieval:Ray et al NEJM April 2009; 360:1460 • 38 kidneys from 19 donors usually femoral cannulation, Maastricht II or misplaced cannulae. Blue at explant despite flushing. • Machine perfusion: kidneys improved 34 transplanted with reasonable outcomes- 10 dual, 14 single kidney transplants

  23. Use/non use of kidneys from NHBD’s by unit:(highlighted units not using mps)

  24. Units not using machine perfusion (April 2008-2009)

  25. Use rate between machine perfusion sites (April 2008-9) *: 0.0099 Chi square versus other centres

  26. Cold ischaemia after primary warm ischaemia • Widely held that DCD organs extra-sensitive to damage by cold ischaemia • Dominic Summers on NHS BT data of 748 DCD kidneys increased failure with: • Old donors (>60 hazard ratio 2.3, p=0.001) • Old recipients (>60 hazard ratio 2.03, p=0.01) • Cold ischaemia (>12 hours hazards ratio 1.9 p=0.06)

  27. Dominic Summers NHS BT data Suggests minimising cold ischaemia is critical Abstract number 0094

  28. In summary • DCD versus DBD kidneys same outcome survival/gfr of MIII donors • Agonal period- how long- short for liver, kidney can be long (with DGF but no consequence on long term outcome) • To minimise excessive call outs a form of ‘apnoea’ test could be employed by a national retrieval team

  29. In summary-2 • Machine perfusion for kidneys after NHBD not essential for MIII donors • Outcome improved by MPS according to the European trial • Non use rate of kidneys is higher with static storage of the order of 10% • Cold ischaemia should be minimised for kidneys particularly NHBD

  30. Sharing NHBD kidneys, which donor? which kidney? Meeting 27.4.10 • Standard donor: donors 10-39yrs, no hypertension, no CVA, terminal serum creatinine< 133μmol/l • Short agonal period (short period whilst BP<60)- (max ?1 hour- same as liver) • Short period asystolle to perfusion (max ?30mins) • Aortic cannulation rather than femoral • Kidney pale and well flushed on retrieval • Experienced retrieval surgeon • UW flush after initial low viscosity flush Marshals or HTK • Machine perfusion would give some security to the receiving centre • Transplant unit should not be too far from donor unit • Recipient transplanted with a virtual crossmatch to minimise cold ischaemia

  31. Non sharing of NHBD kidneys but national retrieval team: Meeting 27.4.10 • All other donors than standard: (older donors, hypertension, CVA, terminal serum creatinine> 133μmol/l) • Longer agonal period permitted ?4/5 hours • Short period asystolle to perfusion (max ?45mins) • Aortic or femoral cannulation but aortic preferable • Local judgement as to kidney use • Machine perfusion or static according to local preference as local unit will be using them • Minimise cold ischaemia ?virtual crossmatch

  32. Immunosuppression post renal transplant after DCD • Schadde et al Transplant Int 2008;21:625 campath v atg v Il2Rab- similar outcomes slightly higher infection with campath • Sanchez-Fructuoso Trans Int 2005; 18: 596 best with antiIl2rAb, low dose tacr, mmf and steroids • Wilson BJS 2005 92:681 anti Il2r, mmf and pred with delayed tacr

  33. Kaplan-Meier of 5yr Graft survival (all-cause graft loss) Oxford/Plym/New Cold Oxford/Plym/New machperf Others Cold storage Others Mach perf n=18 p = 0.78 Dominic Summers NHS BT 2010

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