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The Unrecognized Epidemic of Nephrotoxin-associated Acute Kidney Injury

The Unrecognized Epidemic of Nephrotoxin-associated Acute Kidney Injury. Eric Kirkendall, MD, MBI Medical Director of Clinical Decision Support Hospital Medicine, Biomedical Informatics, James M. Anderson Center for Health Systems Excellence.

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The Unrecognized Epidemic of Nephrotoxin-associated Acute Kidney Injury

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  1. The Unrecognized Epidemic of Nephrotoxin-associated Acute Kidney Injury Eric Kirkendall, MD, MBI Medical Director of Clinical Decision Support Hospital Medicine, Biomedical Informatics, James M. Anderson Center for Health Systems Excellence

  2. We have no other financial relationships to disclose or Conflicts of Interest (COIs) to resolve. This project was funded by grant from the Agency for Healthcare Research and Quality (AHRQ)

  3. Background Nephrotoxic medication (NTMx)-associated Acute Kidney Injury (AKI) is one of the most common causes of AKI in hospitalized children. • Most Common ARF Causes • ATN-Dehydration (21%) • Nephrotoxic drugs (16%) • Sepsis (11%) • Unknown (14%) • Primary Renal Disease (7%) • Hui-Stickle et al, 2005; Pediatric ARF Epidemiology in a Tertiary Care Center from 1999 to 2001

  4. Background Recent studies demonstrate that NTMx-AKI occurs at higher than previously recognized rates. • Patients receiving IV AG > 5 days • AKI by pRIFLE • Primary renal diagnoses excluded • One year of study (n = 557 children, 95% > 3 months of age) • AKI rates by pRIFLE = 33% • Zappitelli et al, 2011; Acute Kidney Injury in non-critically ill children treated with aminoglycoside antibiotics in a tertiary care center

  5. Background Recent studies demonstrate that NTMx-AKI occurs at higher than previously recognized rates. • 86% of patients exposed to at least 1 NTMx • Patients with AKI had 1.7 OR for exposure to a NTMx • PPV for AKI doubles for patient with 3+ NTMx • Moffett et al, 2011; Acute Kidney Injury and Increasing Nephrotoxic-Medication Exposure in Noncritically-ill Children

  6. Background • A portion of NTMx-AKI goes unnoticed due to lack of kidney function surveillance in susceptible children. • SCr measured at least q4 days only 50% of the time in patients on AGs for ≥5 days • Zappitelli, 2011; Acute Kidney Injury in non-critically ill children treated with • aminoglycoside antibiotics in a tertiary care center

  7. Background Nephrotoxic medication (NTMx)-associated Acute Kidney Injury (AKI) is one of the most common causes of AKI in hospitalized children. Recent studies demonstrate that NTMx-AKI occurs at higher than previously recognized rates. • A portion of NTMx-AKI goes unnoticed due to lack of kidney function surveillance in susceptible children.

  8. Background Nephrotoxic medication (NTMx)-associated Acute Kidney Injury (AKI) is one of the most common causes of AKI in hospitalized children. • Hypothesis: • More reliable surveillance of NTMx exposure and injury would demonstrate that rates of AKI are high, that… • an epidemic exists. Recent studies demonstrate that NTMx-AKI occurs at higher than previously recognized rates. • A portion of NTMx-AKI goes unnoticed due to lack of kidney function surveillance in susceptible children.

  9. Objectives of the Study • Quantify the rate of High NTMx exposure and NTMx-AKI in the non-critical care population. • Determine if this EHR-based AKI screening intervention led to changes in AKI prevalence, or duration (intensity)

  10. Methods • Find NTMx-exposed patients prospectively • Reliably monitor serum creatinine (SCr) for evidence of injury • Measure exposure and injury rates, changes over time • Use electronic triggers within the electronic health record (EHR) and automated reports to make the process more efficient and complete

  11. High NTMx-exposure Criteria Patient receiving 3 or more nephrotoxic medications (NTMx) concomitantly* or On an aminoglycoside for 3 or more days *IV radiology contrast, amphotericin, or cidofovir in previous week is counted for the week following administration

  12. Injury (AKI) Criteria* • p (pediatric) • R = Risk, at 150% of baseline creatinine value (SCr) • I = Injured, at 200% of baseline SCr • F = Failure, >= 300% of baseline SCr • L = Loss, persistent failure > 4 weeks • E = End-Stage Renal Disease, > 3 months pRIFLE criteria *KDIGO AKI guideline criteria

  13. Injury (AKI) Criteria* pRIFLE criteria or >= 0.3mg/dL increase in SCr in 48 hours

  14. The Process

  15. AKI Surveillance Algorithm

  16. AKI Surveillance Algorithm Meets High NTMx Exposure Criteria

  17. Injury surveillance loop AKI Surveillance Algorithm

  18. AKI Surveillance Algorithm Exposure surveillance loop

  19. AKI Surveillance Algorithm End Surveillance

  20. Daily email report with links…

  21. Demographics

  22. Demographics Last 3 SCr

  23. Demographics Last 3 SCr NTMx’s

  24. Inclusion Flowchart

  25. Distribution of Exposure and Injury • 2.9% of all admitted patients were High-NTMx exposed • AKI occurred in 25% of highly exposed unique patients; 31% of all exposed admissions developed AKI

  26. Distribution of Exposure and Injury • 2.9% of all admitted patients were High-NTMx exposed • AKI occurred in 25% of highly exposed unique patients; 31% of all exposed admissions developed AKI

  27. Rate of Exposure total number of new High NTMx exposure patients in a given week total number of non ICU days in a given week Rate of exposure= * 1000 days

  28. total number of new NTMx-AKI patients in a given week total number of non ICU days in a given week Rate of AKI= * 1000 days

  29. Proportion of high NTMx exposure patients who develop AKI Avg: 25.5 total number of new High NTMx exposure patients in a given week total number of new AKI patients in a given week Percent =

  30. Desired change AKI Intensity total number of AKI days in a given week total number of High NTMx-exposed days in a given week AKI Intensity= * 100 days

  31. Potential to save ~900 AKI days per year!! $$$ Desired change AKI Intensity total number of AKI days in a given week total number of High NTMx-exposed days in a given week AKI Intensity= * 100

  32. Summary Table

  33. Limitations • External validity; data from only one site • Future work to spread project to other large pediatric institutions • AKI attribution to NTMx exposure • Possible that other etiologies of AKI were present, but patients had to be susceptible (exposed to NTMx) to be included in our study cohort

  34. Take Home Points • A reliable prediction and detection system detected high numbers of NTMx-exposed and NTMx-AKI patients • NTMx-AKI is a relatively common phenomenon in hospitalized non-ICU children • Sub-populations have been identified as targets for future interventions • Large potential for preventing AKI and saving healthcare dollars

  35. Many thanks to the “Nephro Ninjas” and for allowing us to present our data today… Cynthia Barclay, PharmD, & all the clinical pharmacists!! Joshua Schaffzin, MD, PhD Marshall Ashby, MBA, MHSM Stuart Goldstein, MD

  36. Next Steps • Still tweaking queries • Interventions planned for target subsets of patient population (Pulmonary, BMT, GI) • Spread to other institutions • Several manuscripts on their way!!

  37. Challenges • Complexity: novel definitions/metrics, surveillance algorithms, trigger queries, inclusion/exclusion criteria • Competition for resources • Rapid-cycle QI methodologies vs static programming • Multidisciplinary approach: many, many people involved

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