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Related Concept Videos

Factors Affecting Renal Clearance: Renal Impairment01:17

Factors Affecting Renal Clearance: Renal Impairment

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.
One condition associated with renal failure is uremia. Uremia is characterized by impaired glomerular filtration and fluid accumulation in the body. This condition hinders the renal clearance of drugs, resulting in drug accumulation and potential...
Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate01:25

Drug Dosing in Renal Diseases: Measurement of Glomerular Filtration Rate

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...
Renal Failure: Dose Adjustments01:11

Renal Failure: Dose Adjustments

In patients with renal impairment, drugs undergo significant changes in their pharmacokinetics, which require dosage adjustments to ensure safe and effective therapy.
Reduced renal clearance and elimination rate are common outcomes of renal impairment. These alterations lead to a prolonged elimination half-life and an altered apparent volume of distribution for drugs. As a result, dosage adjustments are typically necessary to maintain optimal drug levels in the body.
However, dosage adjustments...
Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant01:25

Drug Dosing in Renal Diseases: Dose Adjustments Based on Drug Clearance and Elimination Rate Constant

In patients with renal disease, dosage adjustments are necessary to maintain therapeutic plasma drug concentrations and prevent toxicity or subtherapeutic exposure. Renal impairment alters drug pharmacokinetics, especially in conditions like uremia, where changes such as prolonged elimination half-life and altered apparent volume of distribution can significantly affect drug disposition. These changes require careful modification of the dosing regimen to achieve the desired clinical...
Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion01:18

Pharmacokinetics in Geriatric Patients: Effect of Age on Drug Excretion

In geriatric patients, renal physiology undergoes significant changes, including diminished renal blood flow and a lower glomerular filtration rate (GFR), leading to alterations in medication clearance. Drugs such as aminoglycoside antibiotics, lithium, and digoxin, which rely on glomerular filtration for removal from the body, particularly impact pharmacokinetics. These drugs tend to have slower clearance rates in older adults, necessitating careful dosage considerations.Evaluation of renal...
Imaging Studies VII: Vascular Imaging01:19

Imaging Studies VII: Vascular Imaging

DefinitionRenal angiography, also known as renal arteriography, is an imaging technique used to obtain a comprehensive view of blood flow and the vascular structure of blood vessels in the kidneys and surrounding areas.PurposeRenal angiography detects blood vessel abnormalities in the kidneys, such as aneurysms, stenosis, thrombosis, vascular tumors, and renal artery stenosis. It evaluates kidney function and guides interventional treatments like angioplasty or stent placement.Pre-Procedure...

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Related Experiment Video

Updated: Jun 10, 2026

Using 2-Photon Microscopy to Quantify the Effects of Chronic Unilateral Ureteral Obstruction on Glomerular Processes
11:47

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A 7% decrease in the differential renal uptake of MAG3 implies a loss in renal function.

Andrew Taylor1, Amita Manatunga, Raghuveer Halkar

  • 1Department of Radiology, Emory University School of Medicine, Atlanta, GA, USA. ataylor@emory.edu

Urology
|August 17, 2010
PubMed
Summary
This summary is machine-generated.

Serial renal scans using 99mTc-mercaptoacetyltriglycine (MAG3) are highly reproducible. A decrease in relative renal uptake of 7% or more on MAG3 scans indicates a significant loss of kidney function.

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Last Updated: Jun 10, 2026

Using 2-Photon Microscopy to Quantify the Effects of Chronic Unilateral Ureteral Obstruction on Glomerular Processes
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06:38

Early Detection of Drug-Induced Renal Hemodynamic Dysfunction Using Sonographic Technology in Rats

Published on: March 11, 2016

Area of Science:

  • Nephrology
  • Nuclear Medicine
  • Urology

Background:

  • Serial 99mTc-mercaptoacetyltriglycine (MAG3) scans are used to monitor kidney function.
  • A decrease in relative renal uptake may signify functional decline and necessitate management changes.
  • Establishing a threshold for meaningful change in MAG3 uptake is crucial for accurate patient management.

Purpose of the Study:

  • To define a clinically significant change in serial relative renal uptake measurements using MAG3.
  • To determine the normal variation of other common MAG3 renogram parameters.
  • To provide guidance for interpreting serial MAG3 scan results in urology patients.

Main Methods:

  • Prospective study of 24 male urology patients with stable renal function.
  • Serial MAG3 renal scans performed approximately 11 days apart.
  • Measurements included relative renal function, time to maximum counts, and 20-minute to maximum count ratios.

Main Results:

  • High reproducibility for relative renal uptake measurements (Pearson and intraclass correlations of 0.98).
  • No significant bias observed between baseline and repeat MAG3 uptake measurements.
  • Mean differences in relative uptake were small (e.g., 0.08 ± 3.07% for the right kidney).

Conclusions:

  • MAG3 renogram parameters, including relative renal uptake, demonstrate high reproducibility.
  • A decrease in relative renal uptake of ≥7% signifies a loss of renal function.
  • These findings support the reliable use of MAG3 scans for monitoring kidney function changes.