Monday, January 24, 2011

CHRONIC KIDNEY DISEASES-A Brief Overview

CKD Vs CRF

Chronic renal failure (CRF) is defined as progressive loss of kidney function. As the terminology is very wide ,difficult to define and to label specifically, a new and wider terminology is needed.In 2000, the National Kidney Foundation (NKF) Kidney Disease Outcome Quality Initiative (K/DOQI) Advisory Board approved development of clinical practice guidelines to define Chronic Kidney Disease (CKD) and to classify stages in the progression of chronic kidney disease

Kidney Vs Renal

The word “kidney” is of Middle English origin and is immediately understood by patients, their families, providers, health care professionals, and the lay public of native English speakers.On the other hand, “renal” and “nephrology,” derived from Latin and Greek roots, respectively, commonly require interpretation and explanation.Therefore kidney is chosen in the new terminology instead of renal.The term Acute Renal Failure and “End-Stage Renal Disease” (ESRD) has been retained

DEFINITION OF CHRONIC KIDNEY DISEASE




























STAGES OF CHRONIC KIDNEY DISEASE





























Glomerular Filtration Rate (GFR)
The flow rate of filtered fluid through the kidneys.
Measurement:
   Inulin Clearance
   Radio-isotopes
  • Crhomium  EDTA
  •  Tc DTPA
  •   Iohexol   
  •  
 Normal GFR
  • Mean values of 127 mL/min/1.73 m2 in men and 118 mL/min/1.73 m2 in women
   (standard deviation of 20 mL/min/1.73m2).
  • After the age of 30 years, GFR decreases by approximately 1.0 mL/min/1.73 
Relationship Between Serum Creatinine & GFR (Inulin Clearance):




  







































UrINARY CREATININE CLEARANCE


  1. Creatinine Clearance:
The volume of blood plasma that is cleared of creatinine/unit time
An approximation of  GFR – 24 hour urine calculation of creatinine clearance





The creatinine clearance is usually determined from a 24 hour urine collection
Result must be in ml/min

Creat Cl = Urinary Creat (mmol/l) x  Urine Volume(ml)
                           Time (hr)x Plasma Creat(umol/l)
  2    .Limitations with creatinine clearance

  • Inadequate urine volume – esp in patient with advanced CKD
  • Lab error – result as variation of measured creat 
  • Increase creat secretion -Some patients with advanced disease have a creatinine clearance that exceeds the GFR by more than two fold.



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