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Related Concept Videos

PD Controller: Design01:26

PD Controller: Design

In automotive engineering, car suspension systems often employ Proportional Derivative (PD) controllers to enhance performance. PD controllers are utilized to adjust the damping force in response to road conditions. A controller, acting as an amplifier with a constant gain, demonstrates proportional control, with output directly mirroring input.
Designing a continuous-data controller requires selecting and linking components like adders and integrators, which are fundamental in Proportional,...
Time-Domain Interpretation of PD Control01:07

Time-Domain Interpretation of PD Control

Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
Consider the example of control of motor torque. Initially, a positive...
Pharmacodynamic Models: Overview01:27

Pharmacodynamic Models: Overview

Pharmacodynamic (PD) responses describe the interaction between a drug and its biological target, culminating in a physiological effect. These responses can be classified into different types: continuous variables, such as blood glucose levels; categorical outcomes, like survival rates; and time-to-event metrics, such as disease progression. Understanding and modeling PD responses are critical for optimizing drug efficacy and safety.PD models describe the relationship between drug concentration...
Pharmacokinetic–Pharmacodynamic Relationship: Exposure, Response and Effect01:26

Pharmacokinetic–Pharmacodynamic Relationship: Exposure, Response and Effect

The pharmacokinetic-pharmacodynamic (PK-PD) relationship describes the intricate link between drug exposure, efficacy, and toxicity, forming the foundation for optimal dosing regimens. This relationship uses mathematical modeling to characterize drug concentration-effect dynamics, ensuring precise therapeutic outcomes.Exposure represents the pharmacokinetic aspect of the PK-PD relationship, denoting the drug amount that elicits a biological response. It is typically quantified by administered...
Pharmacokinetic–Pharmacodynamic Relationship: Problems01:24

Pharmacokinetic–Pharmacodynamic Relationship: Problems

The empirical approach to drug therapy optimization relies on correlating pharmacological response with administered dosage. Such an approach can be costly, time-consuming, and often yields poor correlation due to variables like formulation factors and drug elimination characteristics. A more precise approach correlates response with plasma drug concentration or the amount of drug in the body, rather than dosage. This is achieved through pharmacokinetic-pharmacodynamic (PK/PD) modeling, which...
Hemodialysis II: Procedure and Complications01:24

Hemodialysis II: Procedure and Complications

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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Related Experiment Video

Updated: Jun 28, 2026

Technique and Considerations in the Use of 4x1 Ring High-definition Transcranial Direct Current Stimulation (HD-tDCS)
15:05

Technique and Considerations in the Use of 4x1 Ring High-definition Transcranial Direct Current Stimulation (HD-tDCS)

Published on: July 14, 2013

PD and HD in combination.

R Dell Aquila1, C Ronco

  • 1Department of Nephrology, Dialysis and Transplantation, St. Bortlo Hospital, Vicenza, Italy. eagle@goldnet.it

Nefrologia : Publicacion Oficial De La Sociedad Espanola Nefrologia
|October 30, 2008
PubMed
Summary
This summary is machine-generated.

Bimodal dialysis (PD + HD) combines peritoneal dialysis and hemodialysis for end-stage renal disease. This approach aims to preserve residual renal function and enhance solute removal, offering a potential solution for managing uremic states effectively.

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Area of Science:

  • Nephrology
  • Renal Replacement Therapy

Background:

  • End-stage renal disease (ESRD) necessitates dialysis, with peritoneal dialysis (PD) and hemodialysis (HD) being primary treatments.
  • PD preserves residual renal function (RRF), crucial for patient outcomes, while HD offers superior solute clearance but poses cardiovascular challenges.
  • Limitations of PD alone arise with RRF loss, necessitating alternative strategies.

Purpose of the Study:

  • To explore the benefits and challenges of combining PD and HD, known as bimodal dialysis (BMD).
  • To discuss the optimal prescription for BMD, typically 5-6 days of PD with 1-2 weekly HD sessions.
  • To address the controversy in evaluating BMD adequacy, particularly the limitations of equivalent renal clearance (EKR).

Main Methods:

  • Review of existing literature on PD, HD, and bimodal dialysis (BMD).
  • Comparison of the advantages and disadvantages of individual dialysis modalities.
  • Discussion of methods for assessing the adequacy of combined PD and HD treatments.

Main Results:

  • BMD offers a synergistic approach, leveraging PD's RRF preservation and HD's solute removal capabilities.
  • The EKR method for assessing BMD adequacy may overestimate the delivered dialysis dose.
  • Alternative methods like total effluent sampling (Kt/Vef, CCref) provide a more accurate measure of dialysis dose.

Conclusions:

  • Bimodal dialysis (PD + HD) is a viable strategy to manage ESRD, especially when PD alone becomes insufficient.
  • Accurate assessment of dialysis adequacy in BMD is critical and may require methods beyond EKR.
  • Further research into optimizing BMD prescriptions and evaluation metrics is warranted.