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Related Concept Videos

Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate01:25

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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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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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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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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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The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
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Related Experiment Video

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A Modified Two Kidney One Clip Mouse Model of Renin Regulation in Renal Artery Stenosis
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Decrease of glomerular filtration rate may be attributed to the microcirculation damage in renal artery stenosis.

Hao-Jian Dong, Cheng Huang, De-Mou Luo

  • 1Department of Cardiology, Guangdong Cardiovascular Institute, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou 510100, China.

Chinese Medical Journal
|March 12, 2015
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Summary

Renal artery stenosis (RAS) severity does not predict glomerular filtration rate (eGFR) decline. Microcirculation impairment, not stenosis degree, significantly impacts kidney function in RAS patients.

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Area of Science:

  • Nephrology
  • Cardiovascular Medicine
  • Medical Diagnostics

Background:

  • Renal artery stenosis (RAS) is linked to decreased glomerular filtration rate (GFR), but the precise relationship remains unclear.
  • The impact of varying degrees of arterial narrowing on kidney function requires further investigation.

Purpose of the Study:

  • To investigate the relationship between renal artery stenosis severity, estimated glomerular filtration rate (eGFR), and renal microcirculation markers.
  • To determine if microcirculation markers can predict GFR decline in patients with RAS.

Main Methods:

  • Prospective cohort study of 215 patients undergoing selective renal artery angiography.
  • Patients were categorized by RAS severity (≥50% vs. <50%) and eGFR levels.
  • Comparison of microcirculation markers (plasma cystatin C, urinary microalbumin-to-creatinine ratio) across different RAS severity and eGFR groups.

Main Results:

  • Microcirculation markers showed no significant difference based on RAS severity (≥50% vs. <50%) or corresponding decline with increasing stenosis.
  • While eGFR was lower in the RAS group, it did not decrease proportionally with RAS severity.
  • Markers like plasma cystatin C and urinary microalbumin-to-creatinine ratio significantly correlated with eGFR decline, particularly in severe RAS (≥80%).

Conclusions:

  • RAS severity is an unreliable predictor of eGFR.
  • Microcirculation impairment plays a substantial role in glomerular filtration loss among patients with RAS.