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Related Concept Videos

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...
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

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...
Blood and Nerve Supply to the Kidney01:18

Blood and Nerve Supply to the Kidney

The kidneys are vital organs responsible for filtering and cleaning blood, removing waste products, and regulating electrolyte levels. To perform these essential functions, they require a constant and robust blood supply.
Bloody Supply to the Kidneys:
The kidneys receive their blood supply from the renal arteries, which branch off from the abdominal aorta—the main artery supplying the abdomen and lower body. The renal arteries enter the kidneys at the hilum, a notch on the medial side of each...
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: 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...
Glomerular Filtration Rate and its Regulation01:28

Glomerular Filtration Rate and its Regulation

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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Related Experiment Video

Updated: Jun 6, 2026

Multilevel Microdissection and Functional-Structural Profiling of Human Renal Arterial Branches
06:51

Multilevel Microdissection and Functional-Structural Profiling of Human Renal Arterial Branches

Published on: September 5, 2025

Renal dysfunction does not affect the peripheral-to-central arterial pressure transfer function.

Rupert A Payne1, Pajaree Lilitkarntakul, Neeraj Dhaun

  • 1Clinical Pharmacology Unit, Centre for Cardiovascular Science, Queen's Medical Research Institute, Edinburgh, UK. r.payne@ed.ac.uk

Hypertension (Dallas, Tex. : 1979)
|November 10, 2010
PubMed
Summary
This summary is machine-generated.

Arterial generalized transfer functions (GTFs) accurately estimate central blood pressure in chronic kidney disease patients. Renal dysfunction does not impact GTF accuracy, allowing reliable use across all disease stages.

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Assessment of Vascular Function in Patients With Chronic Kidney Disease
08:50

Assessment of Vascular Function in Patients With Chronic Kidney Disease

Published on: June 16, 2014

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Multilevel Microdissection and Functional-Structural Profiling of Human Renal Arterial Branches
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Multilevel Microdissection and Functional-Structural Profiling of Human Renal Arterial Branches

Published on: September 5, 2025

Assessment of Vascular Function in Patients With Chronic Kidney Disease
08:50

Assessment of Vascular Function in Patients With Chronic Kidney Disease

Published on: June 16, 2014

Area of Science:

  • Cardiovascular Physiology
  • Nephrology
  • Biomedical Engineering

Background:

  • Arterial generalized transfer functions (GTFs) are used to estimate central blood pressure from peripheral artery measurements.
  • Analysis of central waveforms is crucial for assessing patients with chronic kidney disease (CKD).
  • The impact of renal disease on GTF accuracy is not well understood.

Purpose of the Study:

  • To investigate whether renal disease affects arterial generalized transfer functions (GTFs).
  • To determine if GTFs can be reliably used in patients with varying stages of chronic kidney disease.

Main Methods:

  • Simultaneous carotid and radial artery waveforms were measured in 94 subjects with CKD (stages 1-5) and 14 controls using applanation tonometry.
  • GTFs were calculated using Fourier analysis.
  • Derived central waveforms were obtained by applying GTFs to radial waveforms; comparisons were made with measured central waveforms.

Main Results:

  • Glomerular filtration rate inversely correlated with central systolic, mean, and diastolic blood pressures, and central augmentation index.
  • Derived central waveforms showed no significant differences from measured waveforms in key parameters like systolic blood pressure and augmentation index.
  • No significant relationship was found between the degree of bias in derived waveforms and CKD stage or glomerular filtration rate.

Conclusions:

  • The peripheral-to-central GTF is not significantly affected by the degree of renal dysfunction.
  • GTFs can be used with equivalent accuracy in patients with varying stages of chronic kidney disease.
  • This validates the use of GTFs for central blood pressure estimation in CKD populations.