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Related Concept Videos

Kidney Structure01:45

Kidney Structure

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The kidneys are two large bean-shaped organs located in the upper abdomen. They filter the blood several times a day to remove toxins and rebalance water and electrolytes of the circulatory system via the renal veins. The kidneys receive blood directly from the heart via the renal arteries. These arteries enter the kidney at the hilum, the concave surface of the bean, where they branch and divide into smaller vessels and capillaries.
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Renal Tubule and Collecting Duct01:24

Renal Tubule and Collecting Duct

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The renal tubule is divided into three parts: the proximal convoluted tubule (PCT), the Loop of Henle (LOH), and the distal convoluted tubule (DCT).
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
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Renal Drug Excretion: Effect of Urine pH, Flow Rate, and Drug pKa01:22

Renal Drug Excretion: Effect of Urine pH, Flow Rate, and Drug pKa

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The pH of urine, the drug's pKa, and the urine flow rate are vital parameters for drug reabsorption and excretion. Urinary pH varies between 4.6 and 8.0 and is influenced by diet, drug intake, and the patient's pathophysiology. It affects a drug's ionization state and reabsorption. For instance, carbohydrate-rich food produces alkaline urine promoting drug excretion, while proteins and certain medications like ascorbic acid lead to acidic urine enhancing reabsorption.
The pKa of a...
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Renal Drug Clearance: Overview01:06

Renal Drug Clearance: Overview

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Renal clearance is a crucial parameter in pharmacokinetics that quantifies the rate at which the kidneys excrete a drug. It represents a constant fraction of the central volume of distribution containing the drug that the kidney eliminates per unit of time.
Renal clearance can be calculated using different methods. One approach is to divide the urinary drug excretion rate by the plasma drug concentration. This method directly measures renal clearance, indicating the kidneys' efficiency in...
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Renal Drug Excretion: Tubular Secretion01:28

Renal Drug Excretion: Tubular Secretion

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Active tubular secretion is a robust, energy-demanding process that utilizes carrier systems to transport drugs into renal tubules. The active renal secretion systems include the organic anion transporter (OAT) for weak acids and the organic cation transporter (OCT) for weak bases. Structurally similar drugs can compete for the same transporter, potentially leading to drug accumulation and toxicity. However, this principle can be exploited therapeutically. One example is probenecid (Probalan),...
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Nephrons01:10

Nephrons

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The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma...
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Updated: Jun 3, 2025

Author Spotlight: Developing a Bedside Protocol for Kidney and Genitourinary Ultrasonography
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Author Spotlight: Developing a Bedside Protocol for Kidney and Genitourinary Ultrasonography

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Pediatric Nephrolithiasis: A Changing Landscape Through Time and Space.

Luca Pecoraro1, Arianna Zuccato1, Rebecca Vitella1

  • 1Pediatric Unit, Department of Surgical Sciences, Destiny, Gynecology and Pediatrics, University of Verona, 37126 Verona, Italy.

Medicina (Kaunas, Lithuania)
|January 8, 2025
PubMed
Summary

Pediatric nephrolithiasis, or kidney stones in children, is increasing due to lifestyle and environmental factors. Comprehensive metabolic evaluation is crucial for identifying and managing modifiable risks to prevent recurrence.

Keywords:
calciumcitratekidney stonesoxalatepediatric nephrolithiasisuric acid

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Area of Science:

  • Pediatric Nephrology
  • Metabolic Disorders
  • Environmental Health

Background:

  • Pediatric nephrolithiasis incidence is rising significantly.
  • Traditional causes include metabolic disorders and genetics.
  • Emerging factors include lifestyle, obesity, diabetes, and climate change.

Purpose of the Study:

  • To highlight the evolving causes of pediatric kidney stones.
  • To emphasize the importance of comprehensive metabolic evaluation.
  • To guide diagnostic and management strategies.

Main Methods:

  • Review of current literature on pediatric nephrolithiasis.
  • Analysis of changing risk factors.
  • Emphasis on diagnostic metabolic assessment.

Main Results:

  • Kidney stone causes in children are shifting towards lifestyle and environmental factors.
  • Obesity, metabolic syndrome, and diabetes are increasingly implicated.
  • Early and comprehensive metabolic evaluation is key.

Conclusions:

  • A thorough metabolic workup is essential for pediatric kidney stone patients.
  • Identifying modifiable risk factors can prevent stone recurrence.
  • This approach reduces surgical intervention and comorbidity burden.