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Related Concept Videos

Kidney Structure01:45

Kidney Structure

68.5K
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 Failure: Dose Adjustments01:11

Renal Failure: Dose Adjustments

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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...
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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.
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...
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Heart Failure Drugs: Diuretics01:22

Heart Failure Drugs: Diuretics

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Heart failure and kidney perfusion are interconnected in a complex way. Reduced renal perfusion and venous congestion are two significant factors that contribute to renal dysfunction in heart failure. The kidneys, primarily responsible for fluid balance in the body, are adversely affected due to compromised cardiac output and increased venous pressure. In response to reduced renal perfusion, the kidneys activate neurohumoral mechanisms to restore balance. However, these mechanisms can be...
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Drug Elimination by Renal Route: Glomerular Filtration01:17

Drug Elimination by Renal Route: Glomerular Filtration

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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 takes place. 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...
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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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5/6 Nephrectomy Using Sharp Bipolectomy Via Midline Laparotomy in Rats
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Optimizing kidney allocation: challenges and solutions.

Darren E Stewart1, Loren Gragert2, Michal A Mankowski1

  • 1Department of Surgery, NYU Langone Health, New York, New York.

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The U.S. kidney allocation system needs an overhaul due to high kidney nonuse and poor outcomes. A new continuous, points-based system and advances in immunology, like eplet matching, offer hope for better kidney transplant efficiency and recipient results.

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Area of Science:

  • Nephrology
  • Transplantation Immunology
  • Public Health Policy

Background:

  • Current U.S. kidney allocation faces significant challenges, including a nearly 30% nonuse rate and suboptimal long-term recipient outcomes.
  • Existing allocation policies, based on 250-nautical mile circles, are increasingly inadequate for efficient organ distribution.

Purpose of the Study:

  • To review recent studies and initiatives aimed at improving the U.S. kidney allocation system.
  • To highlight advancements in transplant immunology and policy that could enhance kidney transplantation.

Main Methods:

  • Review of current literature and policy initiatives from the Organ Procurement & Transplantation Network (OPTN).
  • Analysis of challenges and opportunities in transitioning to a continuous, points-based allocation system.
  • Examination of advances in molecular HLA typing and eplet matching for donor-recipient compatibility.

Main Results:

  • The OPTN is working to transition from a geographic (250-nautical mile circles) to a continuous, points-based kidney allocation system.
  • Progress has been hampered by challenges in designing a system that guarantees improved placement efficiency.
  • Advances in transplant immunology, such as molecular HLA typing, show promise for more precise donor-recipient matching and improved long-term outcomes.

Conclusions:

  • The current one-size-fits-all kidney allocation system requires significant reform.
  • A continuous distribution paradigm offers flexibility for innovative solutions to improve equity and efficiency.
  • The OPTN should conduct controlled experiments with continuous distribution policies and integrate immunological advances like eplet matching into allocation decisions.