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Related Concept Videos

Hemodialysis I: Introduction01:25

Hemodialysis I: Introduction

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Hemodialysis (HD) is a medical treatment that artificially removes waste products, excess fluids, and toxins from the blood when the kidneys are no longer able to perform these functions effectively. In this process, blood is filtered through a semipermeable membrane, allowing for the selective removal of waste while preserving necessary components like blood cells and proteins. Hemodialysis is typically performed in patients with end-stage renal disease (ESRD) or severe kidney...
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Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Renal failure occurs when the kidneys lose their ability to filter waste products from the blood effectively. It can be classified into two types: acute renal failure (ARF) and chronic renal failure (CRF).
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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...
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DialyzersA hemodialysis (HD) dialyzer is a plastic cartridge containing thousands of parallel hollow fibers, which serve as semipermeable membranes. These fibers are typically made from cellulose-based or other synthetic materials. During HD, blood is pumped into the top of the cartridge and distributed among these fibers. Simultaneously, dialysis fluid, known as dialysate, is introduced into the bottom of the cartridge, bathing the outside of the fibers. Across the semipermeable membrane,...
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Optimization of dialysis catheter function.

Maurizio Gallieni1,2, Antonino Giordano1, Umberto Rossi3

  • 1Nephrology and Dialysis Unit, Ospedale San Carlo Borromeo, Milan - Italy.

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Central venous catheters (CVCs) are vital for hemodialysis but can dysfunction due to thrombus or sheath formation. Thrombolysis or catheter exchange can restore blood flow, preventing complications and improving patient outcomes.

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Area of Science:

  • Nephrology
  • Vascular Access
  • Medical Devices

Background:

  • Central venous catheters (CVCs) are critical for hemodialysis.
  • CVCs are associated with significant complications like thrombosis and infection.
  • CVC-related dysfunction impacts patient morbidity and mortality.

Purpose of the Study:

  • To review the etiology, prevention, and management of CVC-related dysfunction.
  • To highlight the role of thrombus and fibrin sheath in CVC dysfunction.
  • To discuss treatment options and preventative strategies for maintaining CVC patency.

Main Methods:

  • Literature review focusing on CVC dysfunction in hemodialysis.
  • Analysis of causes including intraluminal/extrinsic thrombus and fibrin sheath formation.
  • Evaluation of therapeutic interventions such as thrombolysis and catheter exchange.

Main Results:

  • Thrombus and fibrin sheath formation are primary causes of CVC dysfunction and inadequate blood flow.
  • Thrombolysis with urokinase or rTPA can effectively restore blood flow in many cases.
  • Catheter exchange with fibrin sheath disruption offers an alternative when thrombolytics fail.

Conclusions:

  • Effective management of CVC dysfunction is crucial for adequate hemodialysis and patient well-being.
  • Preventative measures, including anticoagulant/thrombolytic locks, are important but only partially effective.
  • Further research is needed to establish the risk-benefit profile of chronic oral anticoagulation for CVC patency.