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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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Hemodialysis II: Procedure and Complications01:24

Hemodialysis II: Procedure and Complications

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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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Hemodialysis III: Nursing Management01:25

Hemodialysis III: Nursing Management

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The nursing management of a patient undergoing hemodialysis includes several critical steps, starting with a thorough assessment before the procedure.Before the Hemodialysis ProcedureFirst, record the patient's vital signs—blood pressure, heart rate, respiratory rate, and temperature—to establish a baseline. This baseline is essential for detecting conditions such as hypotension that could impact the patient's response to dialysis. Document the patient's pre-dialysis weight, as this...
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Dialysis01:15

Dialysis

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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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Peritoneal Dialysis I: Introduction and Procedure01:30

Peritoneal Dialysis I: Introduction and Procedure

366
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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Continuous Renal Replacement Therapy01:30

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Continuous Renal Replacement Therapy, also known as CRRT, is a procedural treatment for acute kidney injury (AKI) that gradually removes uremic toxins and fluids while maintaining acid-base balance and stabilizing electrolytes. It is particularly useful for hemodynamically unstable patients. Unlike intermittent hemodialysis, which is faster, CRRT provides a gentler approach over 24 hours, closely mimicking the function of natural kidneys. However, CRRT is not ideal for patients with...
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Updated: Sep 29, 2025

A Modified EPA Method 1623 that Uses Tangential Flow Hollow-fiber Ultrafiltration and Heat Dissociation Steps to Detect Waterborne Cryptosporidium and Giardia spp.
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Basic prerequisites for on-line, high-volume hemodiafiltration.

Richard A Ward1

  • 1Nelson, New Zealand.

Seminars in Dialysis
|March 22, 2022
PubMed
Summary
This summary is machine-generated.

High-volume hemodiafiltration uses online-prepared sterile fluids, requiring user diligence for safe operation. Ensuring fluid sterility and adequate filtration volume is crucial for effective hemodiafiltration therapy.

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Area of Science:

  • Nephrology
  • Biomedical Engineering
  • Medical Device Technology

Background:

  • High-volume hemodiafiltration (HVF-HDF) requires over 23 liters of sterile substitution fluid per treatment.
  • The large fluid volume necessitates on-line preparation, precluding prepackaged sterile fluids.
  • On-line fluid preparation relies on specialized machines with bacteria- and endotoxin-retentive filters.

Purpose of the Study:

  • To outline the requirements and responsibilities for successful on-line hemodiafiltration.
  • To address concerns regarding the sterility and non-pyrogenicity of on-line prepared substitution fluid.
  • To understand factors limiting the adoption of on-line hemodiafiltration.

Main Methods:

  • Utilizing machines with validated sterilizing ultrafilters for on-line fluid preparation.
  • Adhering to machine manufacturer's instructions and international standards for filter operation.
  • Ensuring dialysis water/fluid quality meets specifications for filter sterilization.

Main Results:

  • Sterilizing ultrafilters are validated to deliver sterile, non-pyrogenic fluid when operated correctly.
  • User responsibility is key: ensuring input fluid quality and appropriate treatment prescription for target filtration volume.
  • Concerns about routine fluid sterility have hindered on-line hemodiafiltration adoption in some regions.

Conclusions:

  • Successful on-line hemodiafiltration depends on validated filtration technology and strict user adherence to protocols.
  • User vigilance in maintaining input fluid quality and optimizing treatment parameters is essential for patient safety.
  • Addressing concerns about on-line fluid sterility is critical for broader implementation of this therapy.