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Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

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The Glomerular Filtration Rate (GFR) is a measure of kidney function, reflecting the volume of filtrate formed per minute in the kidneys. On average, GFR is approximately 125 mL/min in males and 105 mL/min in females. Maintaining a relatively constant GFR is essential for the kidneys to effectively regulate body fluid homeostasis and maintain extracellular stability.
GFR regulation involves two primary intrinsic controls: the myogenic and tubuloglomerular feedback mechanisms.
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Glomerular Filtration01:15

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The filtration membrane in the renal system is a highly specialized structure essential for filtering blood. It consists of glomerular capillaries and podocytes, forming a selective barrier that permits the passage of water and small solutes while restricting most plasma proteins and blood cells.
Components of the Filtration Membrane
The filtration process involves three key layers: the glomerular endothelial cells, the basement membrane, and the podocyte-formed filtration slits.
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Glomerular Filtration: Net Filtration Pressure01:26

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Glomerular filtration, a key process in the kidneys, is regulated by three main pressures: Glomerular blood hydrostatic pressure (GBHP), Capsular hydrostatic pressure (CHP), and Blood colloid osmotic pressure (BCOP).
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Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate01:25

Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate

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The glomerular filtration rate (GFR) is a critical indicator of kidney health, reflecting how well the kidneys filter blood. Changes in GFR can signal potential kidney impairment, necessitating accurate measurement methods to monitor kidney function effectively.Various molecules can serve as markers for GFR measurement, with the ideal marker meeting several specific criteria. It must freely filter at the glomerulus, avoid reabsorption or secretion by the renal tubules, remain unmetabolized, not...
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Renal Drug Excretion: Glomerular Filtration01:02

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The kidney serves as the primary organ responsible for eliminating drugs and their metabolites from the body. This process, known as renal elimination, starts with glomerular filtration and results in urine formation. Each kidney houses millions of functional units called nephrons, where urine production occurs. A nephron has two main components: a renal corpuscle and a renal tubule.
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Drug Dosing in Renal Diseases: Estimation of Glomerular Filtration Rate Based on Serum Creatinine Concentration01:28

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Glomerular filtration rate (GFR) can be estimated from serum creatinine using the modification of diet in renal disease (MDRD) formula or the chronic kidney disease–epidemiology collaboration (CKD–EPI) equation. Both methods are widely used in clinical practice to assess kidney function and guide treatment decisions.The MDRD equation does not require weight or height measurements and is normalized to the body surface area of 1.73 m², considered the average adult surface area.
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Glomerular Filtration Rates in Asians.

Boon Wee Teo1, Luxia Zhang1, Jinn-Yuh Guh1

  • 1Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore; Renal Division, Department of Medicine, Peking University First Hospital, Beijing, China; Faculty of Renal Care, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Division of Nephrology, Department of Medicine, University of Hong Kong, Hong Kong, China; George Institute for Global Health, New Delhi, India; Division of Nephrology, Ewha Women's University School of Medicine, Korea; Ateneo School of Medicine and Public Health, Pasig, Philippines; Hospital Sultanah Aminah, Johor Bahru, Malaysia; Division of Nephrology, Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand; Qianfoshan Hospital, Shandong University, Jinan, China; and the Department of Medicine, National University Health System, Singapore, Singapore.

Advances in Chronic Kidney Disease
|March 4, 2018
PubMed
Summary

Accurate estimation of glomerular filtration rate (GFR) is crucial for diagnosing chronic kidney disease (CKD). This review examines GFR estimating equations in Asian populations, highlighting the need for ethnicity-specific models.

Keywords:
AsianChronic kidney failureCreatinineCystatin CGlomerular filtration rate

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Area of Science:

  • Nephrology
  • Biomarkers
  • Epidemiology

Background:

  • Established glomerular filtration rate (GFR) estimating equations like the Modification of Diet in Renal Disease (MDRD) study equation and the Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) equation have limitations in diverse ethnic populations.
  • Previous GFR estimating equations were primarily validated in North American and European populations, with inadequate representation of Asian ethnicities.
  • International guidelines recommend the CKD-EPI equation, necessitating evaluation of its performance in Asian populations.

Purpose of the Study:

  • To review and summarize studies validating or developing GFR estimating equations specifically for Asian populations.
  • To assess the performance of existing GFR estimating equations (MDRD, CKD-EPI creatinine, CKD-EPI creatinine and cystatin C) in Asian individuals.
  • To identify the need for and potential development of novel GFR estimating equations tailored to Asian ethnicities.

Main Methods:

  • Systematic review of prospective and retrospective studies conducted in Asia.
  • Inclusion of studies utilizing serum markers traceable to reference materials for GFR estimation.
  • Comparative analysis of GFR estimations from various equations against established benchmarks, particularly CKD-EPI equations.

Main Results:

  • Studies in Asia have evaluated the accuracy of MDRD and CKD-EPI equations in their respective populations.
  • Performance variations were observed among different GFR estimating equations across Asian subgroups.
  • Evidence suggests a potential need for developing new GFR estimating equations optimized for Asian individuals.

Conclusions:

  • Existing GFR estimating equations show variable accuracy in Asian populations.
  • Further research is warranted to develop and validate GFR estimating equations that better represent Asian ethnicities.
  • Improved GFR estimation in Asian populations is critical for accurate CKD diagnosis and management.