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Published byOctavia Jackson Modified over 9 years ago
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Biomarkers to define AKI Michael Zappitelli, MD, MSc
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What are these new biomarkers? KIM-1 NGAL IL-18 TIMP2/IGFBP GST CysC Metabolomics
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Objectives Focus on utility and not actual biomarkers: e.g. PICU, Cardiac Maximizing biomarkers: Renal angina index Future
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1 year old for TOF repair Serum creatinine (umol/L) 0-6 hrs 45 2 days 100 before surgery 40 surgery low BP 5 days peritoneal dialysis
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What happened here … Could this have been prevented? Could novel biomarkers help?
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Post-operative AKI prediction: early SCr rise IL-18 uNGAL pNGAL
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Post-operative AKI prediction: NGAL & IL-18: AUC Adults Children 5 th Quintile cutoffs Sensitivity/Specificity: IL-18: 60 pg/ml 54% /82% 364 pg/ml 38% / 84% uNGAL 102 ng/ml 46% /81% 72 ng/ml 42% / 85% pNGAL 293 ng/ml 50% / 82% 261 ng/ml 27% / 81%
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Biomarker combinations Single: 0.56 – 0.76
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1 year old for TOF repair Serum creatinine (umol/L) 0-6 hrs 45 2 days 100 before surgery 40 surgery low BP 5 days peritoneal dialysis
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12 year old girl with sepsis PICU SCr rise ?truly AKI Will she need dialysis? Will she progress? Nephrotoxins Low BP
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NGAL AUC 0.78
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Adding biomarker to other data
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SCr has risen: should I worry? Outcome: AKI>48 hrs AUC=0.80 Replication cohort, unpublished: Day AKI first appears: NGAL: AUC 0.75 IL-18: AUC 0.80 LFABP: AUC 0.80
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CAN WE DO BETTER? RENAL ANGINA INDEX
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Focus is on QUICK and SIMPLE assessment Intent is to have an index / threshold risk with HIGH NPV No Renal Angina: HIGHLY likely NOT to develop AKI Do NOT study biomarker performance Do NOT use biomarkers to predict AKI (future)
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New: Proposed RA index Basu et al, KI 2014
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Take a step back: summarize Biomarkers: Several candidates – which work best in what patients. Early diagnosis Short term prognosis ?Long-term prognosis Biomarker combinations +/- clinical risk factors likely best Will allow for clinical trials Taking Focus Study: Using biomarkers and fluid overload severity to make decisions on fluid management and CRRT start.
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Suggest to read:
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THANK YOU pCRRT conference organizers Montreal Children’s Hospital AKI research team Collaborators/mentors: Stuart Goldstein, Prasad Devarajan, Chirag Parikh The Kidney Injury During Membrane Oxygenation group
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