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Related Concept Videos

Peritoneum01:21

Peritoneum

The peritoneum is a vital membrane that lines the abdominal cavity and covers most of the organs within it. It plays a crucial role in protecting the organs, providing a smooth surface for their movement, and facilitating various physiological processes. Understanding the anatomy and function of the peritoneum is essential for comprehending the complexities of the abdominal region.
Anatomy of the Peritoneum
The peritoneum is divided into two layers: the parietal peritoneum and the visceral...
Peritoneal Dialysis II: Peritoneal Dialysis Systems and Complications01:25

Peritoneal Dialysis II: Peritoneal Dialysis Systems and Complications

Peritoneal dialysis (PD) is a medical process that removes waste products and excess fluid from the body using the peritoneal membrane as a natural filter.Peritoneal Dialysis MethodsSeveral methods can be used for peritoneal dialysis, including Acute Intermittent Peritoneal Dialysis, Continuous Ambulatory Peritoneal Dialysis, and Automated Peritoneal Dialysis, also known as Continuous Cyclic Peritoneal Dialysis.Acute Intermittent Peritoneal Dialysis (AIPD) is used for patients with uremic...
Membrane Fluidity01:23

Membrane Fluidity

Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.Fatty acids tails of phospholipids can be either saturated or...
Membrane Fluidity01:26

Membrane Fluidity

Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is a relatively...
Peritoneal Dialysis I: Introduction and Procedure01:30

Peritoneal Dialysis I: Introduction and Procedure

Peritoneal dialysis (PD) is a procedure that facilitates the exchange of solutes, waste products, electrolytes, and excess fluid between the blood in the peritoneal capillaries and a dialysis solution introduced into the peritoneal cavity.Principles of Peritoneal Dialysis (PD)Diffusion: Waste products such as urea and electrolytes move from high concentrations in the blood to low concentrations in the dialysate across the peritoneal membrane. This mechanism is driven by the concentration...
What are Membranes?01:24

What are Membranes?

A cell's plasma membrane demarcates the cell's borders and determines the nature of its interaction with the environment. Cells exclude certain substances, take in others, and excrete some others in controlled quantities. The plasma membrane must be flexible to allow certain cells, such as red and white blood cells, to change their shape while passing through narrow capillaries. These are the more obvious plasma membrane functions. In addition, the plasma membrane's surface carries markers that...

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Surgical Techniques for Catheter Placement and 5/6 Nephrectomy in Murine Models of Peritoneal Dialysis
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Determinants of peritoneal membrane function over time.

Simon J Davies1, Lily Mushahar, Zanzhe Yu

  • 1Department of Nephrology, University Hospital of North Staffordshire, Stoke on Trent, Staffordshire, UK. simondavies1@compuserve.com

Seminars in Nephrology
|March 29, 2011
PubMed
Summary

Peritoneal dialysis (PD) patients may develop ultrafiltration failure due to changes in peritoneal membrane function. Avoiding excessive glucose exposure and peritonitis are key strategies to maintain membrane health.

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Area of Science:

  • Nephrology
  • Peritoneal Dialysis
  • Membrane Physiology

Background:

  • Peritoneal membrane function changes over time in PD patients, leading to ultrafiltration failure and encapsulating peritoneal sclerosis.
  • These changes involve increased solute transport and potential fibrosis, often linked to glucose exposure from dialysis solutions, loss of renal function, and peritonitis.

Purpose of the Study:

  • To investigate the mechanisms of peritoneal membrane injury during PD.
  • To identify potential biomarkers of membrane dysfunction.
  • To evaluate strategies for preserving peritoneal membrane function.

Main Methods:

  • Analysis of peritoneal membrane transport characteristics.
  • Assessment of vascularity and peritoneal blood flow.
  • Evaluation of inflammatory cytokines (e.g., IL-6, VEGF) and TGF-β signaling.
  • Review of outcomes with different dialysis solutions.

Main Results:

  • Increased solute transport is associated with increased vascularity and/or blood flow.
  • Progressive fibrosis may reduce osmotic conductance.
  • Interleukin-6 and vascular endothelial growth factor are implicated as mediators of membrane injury.
  • Epithelial to mesenchymal transition driven by TGF-β contributes to fibrosis.

Conclusions:

  • High glucose exposure from conventional PD solutions can injure the peritoneal membrane.
  • While low-glucose degradation product solutions may reduce injury, evidence for long-term functional preservation is limited.
  • Preserving residual renal function, preventing peritonitis, and minimizing glucose exposure are crucial for maintaining peritoneal membrane function.