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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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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.
Drugs gain access to the kidney via the renal artery, which progressively branches off into afferent arterioles....
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Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration01:29

Physiology of the Genitourinary System I: Renal Blood Flow and Glomerular Filtration

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The kidneys are vital organs responsible for regulating blood filtration, waste excretion, and fluid balance, all of which are crucial for maintaining homeostasis. Renal physiology examines renal blood flow, glomerular filtration, and urine formation, ensuring the body’s internal environment remains stable.Renal Blood FlowThe kidneys receive about 20-25% of the cardiac output, typically around 1200 mL of blood per minute in an average adult. Blood flows into the kidneys through the renal...
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Renal Corpuscle01:20

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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.
Glomerulus: Structure and Function
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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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Factors Affecting Renal Clearance: Renal Impairment01:17

Factors Affecting Renal Clearance: Renal Impairment

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Renal dysfunction significantly impairs the renal clearance of drugs, leading to potential complications in drug therapy. Renal failure, which can be caused by various factors, poses a significant challenge in the elimination of drugs from the body.
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Estimation of Nephron Number in Whole Kidney using the Acid Maceration Method
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Glomerular filtration in the aging population.

Irene L Noronha1,2, Guilherme P Santa-Catharina1, Lucia Andrade1

  • 1Renal Division, Hospital das Clinicas, University of São Paulo Medical School, São Paulo, Brazil.

Frontiers in Medicine
|October 3, 2022
PubMed
Summary

Kidney function naturally declines with age, impacting older adults and those with chronic conditions like hypertension and diabetes. Accurate assessment of glomerular filtration rate (GFR) is crucial for effective patient management.

Keywords:
agingelderlyestimated GFRglomerular filtration rate (GFR)renal functionsenescence

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Area of Science:

  • Gerontology
  • Nephrology
  • Internal Medicine

Background:

  • Increased life expectancy leads to a larger elderly population.
  • Elderly individuals often have a higher prevalence of non-communicable diseases like hypertension and diabetes.
  • Kidneys are susceptible to age-related changes and damage from chronic diseases, affecting renal function.

Purpose of the Study:

  • To review the effects of aging on kidney function.
  • To analyze age-related structural and functional changes in the kidneys.
  • To guide clinicians in interpreting and managing age-related decline in renal function.

Main Methods:

  • Review of scientific literature on aging and kidney function.
  • Analysis of age-related structural and functional changes in renal physiology.
  • Examination of methods for evaluating glomerular filtration rate (GFR).

Main Results:

  • Kidney function declines with age due to natural senescence and disease exposure.
  • Various methods exist for assessing GFR, including direct measurements and estimation equations.
  • Age-related changes necessitate careful interpretation of GFR values in older adults.

Conclusions:

  • Accurate assessment of renal function is vital in the elderly population.
  • Understanding age-related GFR changes aids in tailored therapeutic interventions.
  • This review provides support for clinicians managing older patients with decreased kidney function.