practical tips for managing the mist of renal disease
TRANSCRIPT
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Practical Tips for Practical Tips for Managing the Mist of Managing the Mist of
Renal DiseaseRenal Disease
Christine LogarChristine LogarAssistant Professor, NephrologyAssistant Professor, Nephrology
University of WashingtonUniversity of Washington
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What is diabetic kidney disease?What is diabetic kidney disease?
A microvascular complication of diabetes A microvascular complication of diabetes marked by marked by proteinuriaproteinuria and a decline in renal and a decline in renal function, progressing to renal failurefunction, progressing to renal failure
A big problemA big problem
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OutlineOutline
Kidney 101Kidney 101Epidemiology of Diabetes and Kidney diseaseEpidemiology of Diabetes and Kidney diseasePathophysiologyPathophysiologyRisk factors for Development and progressionRisk factors for Development and progressionPrevention/TreatmentPrevention/Treatment
Specific issues in diabetics with CKDSpecific issues in diabetics with CKDDiabetics and DialysisDiabetics and Dialysis
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What do the kidneys do?What do the kidneys do?
Your kidneys are sophisticated filtersYour kidneys are sophisticated filters-- eliminate waste and toxinseliminate waste and toxins-- eliminate or conserve fluideliminate or conserve fluid-- control the acidity of the bloodcontrol the acidity of the blood-- help to make blood cells andhelp to make blood cells and
control bone developmentcontrol bone development-- control blood pressurecontrol blood pressure
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The The nephronnephron
Each Each nephronnephron has two parts:has two parts:1) 1) GlomerulusGlomerulus –– the nonthe non--selective filterselective filter2) The tubules 2) The tubules –– where the urine concentration and where the urine concentration and
composition is determinedcomposition is determined
Some kidney diseases primarily affect the Some kidney diseases primarily affect the glomerulusglomerulus, and , and others the tubules. However by the time you reach end others the tubules. However by the time you reach end stage kidney disease, both are damagedstage kidney disease, both are damaged
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Kidney diseasesKidney diseasesDiseases that affect the Diseases that affect the GlomerulusGlomerulus
DiabetesDiabetesIgAIgA nephropathynephropathy ( ( glomerulonephritisglomerulonephritis))Focal Segmental Focal Segmental GlomerulosclerosisGlomerulosclerosis (FSGS)(FSGS)LupusLupus
Diseases that affect the tubulesDiseases that affect the tubulesPolycystic kidney diseasePolycystic kidney diseaseChronic interstitial nephritisChronic interstitial nephritisChronic Lithium toxicityChronic Lithium toxicity
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What is diabetic kidney disease?What is diabetic kidney disease?
A microvascular complication of diabetes A microvascular complication of diabetes marked by marked by proteinuriaproteinuria and a decline in renal and a decline in renal function (GFR), progressing to renal failure function (GFR), progressing to renal failure (CKD and ESRD)(CKD and ESRD)
A big problemA big problem
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Definition of chronic kidney disease Definition of chronic kidney disease (CKD)(CKD)
Structural or functional abnormalities of the Structural or functional abnormalities of the kidney for kidney for ≥≥ 3 months, with or without a 3 months, with or without a decreased GFR. Abnormalities may be detected decreased GFR. Abnormalities may be detected by renal imaging, urinalysis, blood tests, or renal by renal imaging, urinalysis, blood tests, or renal pathology.pathology.
OROR
GFR < 60 mL/min/1.73 mGFR < 60 mL/min/1.73 m22 for for ≥≥ 3 months3 months
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DO NOT USE FOR INPATIENTSWill only report an exact number if < 60
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85 85 yoyo female with female with creatininecreatinine 1.01.0
30yo African American 30yo African American male with male with creatininecreatinine 1.5
eGFR 57
eGFR 711.5
Neither of these patients may actually have any kidney disease…
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GFR norms by ageGFR norms by age
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PrevalencePrevalence
GFR calculated by MDRD equation
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GlomerularGlomerular filtration rate (GFR)filtration rate (GFR)
The goodThe good……Identify patients Identify patients additional patients at risk additional patients at risk for kidney disease ( < 60) for kidney disease ( < 60) and CKD complicationsand CKD complications
Identify patients at risk Identify patients at risk for medication dosing for medication dosing complications complications
The badThe bad……Not for inpatientsNot for inpatients
Not great at extremes of Not great at extremes of age or weight (mm)age or weight (mm)
Not for patients with Not for patients with relatively preserved renal relatively preserved renal function (function (eGFReGFR > 60 is > 60 is less accurate)less accurate)
A normal GFR ( > 60) does not mean that the patient does not have kidney disease
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Classification of CKDClassification of CKD
StageStage DescriptionDescriptionGFRGFR
(mL/min/1.73m(mL/min/1.73m22))
11 Kidney damage, normal Kidney damage, normal GFRGFR ≥≥ 9090
22 Kidney damage, mild Kidney damage, mild decrease GFRdecrease GFR 6060--8989
33 Moderate decrease GFRModerate decrease GFR 3030--5959
44 Severe decrease GFRSevere decrease GFR 1515--2929
55 Kidney Failure (ESRD)Kidney Failure (ESRD) <15 (or dialysis)<15 (or dialysis)
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What is diabetic kidney disease?What is diabetic kidney disease?
A microvascular complication of diabetes A microvascular complication of diabetes marked by marked by proteinuriaproteinuria and a decline in renal and a decline in renal function (GFR), progressing to renal failure function (GFR), progressing to renal failure (CKD and ESRD)(CKD and ESRD)
A big problemA big problem
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Classification of CKDClassification of CKD
StageStage DescriptionDescriptionGFRGFR
(mL/min/1.73m(mL/min/1.73m22))
11 Kidney damage, normal Kidney damage, normal GFRGFR ≥≥ 9090
22 Kidney damage, mild Kidney damage, mild decrease GFRdecrease GFR 6060--8989
33 Moderate decrease GFRModerate decrease GFR 3030--5959
44 Severe decrease GFRSevere decrease GFR 1515--2929
55 Kidney FailureKidney Failure <15 (or dialysis)<15 (or dialysis)
Diabetes
+ microalbuminuria
+macroalbuminuria
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Definition of albumin excretionDefinition of albumin excretion
Spot collection 24hr Timed collection
(mg/g creatinine) (mg/ 24hr) ( microgram/min)
Normal < 30 < 30 < 20
Microalbuminuria 30-300 30-300 20-200
Macroalbuminuria > 300 > 300 > 200
Overt nephropathy > 500 (protein) > 500
Nephrotic > 3500 (protein) > 3500
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OutlineOutline
Kidney 101Kidney 101Epidemiology of Diabetes and Kidney diseaseEpidemiology of Diabetes and Kidney disease
PathophysiologyPathophysiologyRisk factors for Development and progressionRisk factors for Development and progressionPrevention/TreatmentPrevention/Treatment
Specific issues in diabetics with CKDSpecific issues in diabetics with CKDDiabetics and DialysisDiabetics and Dialysis
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EpidemiologyEpidemiology
World Wide 170World Wide 170--250 million people have DM, 50+ million have 250 million people have DM, 50+ million have CKD*CKD*
7% of the US population has DM7% of the US population has DM90+% are Type II DM90+% are Type II DM30+% don30+% don’’t know that they have DMt know that they have DM
11% of the US Population has CKD or ESRD11% of the US Population has CKD or ESRDabout 1about 1--2% of this 11% has ESRD2% of this 11% has ESRD
500,000 patients on dialysis, projected to 500,000 patients on dialysis, projected to increase to 610,000 by 2010increase to 610,000 by 2010
KDOQI 2007
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EpidemiologyEpidemiology
Diabetes is the leading cause of CKD in developed Diabetes is the leading cause of CKD in developed countries, and rising in developing countries.countries, and rising in developing countries.
In the US,In the US,43% of diabetics have microalbuminuria43% of diabetics have microalbuminuria8% have 8% have macroalbuminuriamacroalbuminuria
Diabetes accounts for 45% of ESRD, up from 18% in Diabetes accounts for 45% of ESRD, up from 18% in 19801980
USRDS 2004
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This is a big problemThis is a big problem
Approach to these patients is multifaceted.Approach to these patients is multifaceted.
Requires many levels of health care providers to Requires many levels of health care providers to work together, integrated care, not organ system work together, integrated care, not organ system based.based.
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Steno study of intensive Steno study of intensive managmentmanagment
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OutlineOutline
Kidney 101Kidney 101Epidemiology of Diabetes and Kidney diseaseEpidemiology of Diabetes and Kidney diseasePathophysiologyPathophysiologyRisk factors for Development and progressionRisk factors for Development and progressionPrevention/TreatmentPrevention/Treatment
Specific issues in diabetics with CKDSpecific issues in diabetics with CKDDiabetics and DialysisDiabetics and Dialysis
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Stages of DKD for Type I diabeticsStages of DKD for Type I diabetics
Stage 1 Stage 1 –– HyperfiltrationHyperfiltration (GFR increases) (GFR increases) Stage 2 Stage 2 –– Silent thickening of the GBM and increase in Silent thickening of the GBM and increase in mesangialmesangial
volumevolumeStage 3 Stage 3 –– microalbuminuriamicroalbuminuria
usually occurs after 6usually occurs after 6--15 years of diabetes15 years of diabetesGFR may be elevated or normalGFR may be elevated or normalBP usually increases in this stage but may remain in the BP usually increases in this stage but may remain in the
““normalnormal”” levellevelincrease in GBM thickness and increase in GBM thickness and mesangialmesangial volumevolume
Stage 4 Stage 4 –– rising rising albuminuriaalbuminuria, overt , overt proteinuriaproteinuriaHTN is well establishedHTN is well establishedProteinuriaProteinuria increases by 15increases by 15--40% per year (average is 20% )40% per year (average is 20% )GFR starts to fall, rapidly (10 ml/min/year)GFR starts to fall, rapidly (10 ml/min/year)
Stage 5 Stage 5 –– ESRD developsESRD develops
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Am J Nephrol 2005; 25:77-94
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OutlineOutline
Kidney 101Kidney 101Epidemiology of Diabetes and Kidney diseaseEpidemiology of Diabetes and Kidney diseasePathophysiologyPathophysiologyRisk factors for Development and progressionRisk factors for Development and progressionPrevention/TreatmentPrevention/Treatment
Specific issues in diabetics with CKDSpecific issues in diabetics with CKDDiabetics and DialysisDiabetics and Dialysis
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Susceptibility to diabetic Susceptibility to diabetic nephropathynephropathy
Poor glycemic controlPoor glycemic controlEthnicityEthnicity
Native Am > Mexican Am > African Am > CaucasianNative Am > Mexican Am > African Am > Caucasian
GenderGenderMale > Female in type I and IIMale > Female in type I and II
AgeAgeHigher risk of type I if diagnosed between 12Higher risk of type I if diagnosed between 12--20 20 yoyo as as opposed to before age 12opposed to before age 12Higher risk of type II if diagnosed after age 50 compared to Higher risk of type II if diagnosed after age 50 compared to before age 40before age 40
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Adapted in part from Table 1. KI 2003; 64, p.371
Risk Factors for ProgressionRisk Factors for Progression
Underlying disease Underlying disease activity activity
HypertensionHypertension
ProteinuriaProteinuria
Exposure to Exposure to NephrotoxinsNephrotoxins
Urinary obstruction or Urinary obstruction or refluxreflux
HyperlipidemiaHyperlipidemia
Chronic anemiaChronic anemia
Cigarette smokingCigarette smoking
ObesityObesity
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What is diabetic kidney disease?What is diabetic kidney disease?
A microvascular complication of diabetes A microvascular complication of diabetes marked by marked by proteinuriaproteinuria and a decline in renal and a decline in renal function (GFR), progressing to renal failure function (GFR), progressing to renal failure (CKD and ESRD)(CKD and ESRD)
A big problemA big problem
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Interventions to prevent or slow the Interventions to prevent or slow the progression of diabetic nephropathyprogression of diabetic nephropathy
Glycemic controlGlycemic controlBlood pressure controlBlood pressure controlControl Control proteinuriaproteinuria
Use of RAAS blockersUse of RAAS blockers
Protein restriction (when all else fails to Protein restriction (when all else fails to decrease decrease proteinuriaproteinuria))
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Interventions to prevent or slow the Interventions to prevent or slow the progression of diabetic nephropathyprogression of diabetic nephropathy
Glycemic controlGlycemic controlBlood pressure controlBlood pressure controlControl Control proteinuriaproteinuria
Use of RAAS blockersUse of RAAS blockers
Protein restriction (when all else fails to Protein restriction (when all else fails to decrease decrease proteinuriaproteinuria))
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