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Related Concept Videos

Hepatitis01:25

Hepatitis

Hepatitis is an inflammatory condition of the liver most commonly caused by hepatotropic viruses (A–E), though non-infectious causes such as alcohol and drugs also exist.Hepatitis AHepatitis A virus (HAV) is a non-enveloped RNA virus of the Picornaviridae family. It is primarily transmitted via the fecal-oral route, typically through ingestion of contaminated food or water. After ingestion, HAV enters the bloodstream through the oropharynx or intestinal epithelium and reaches the liver. The...
Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test01:22

Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test

In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess the...
Physiological Pharmacokinetic Models: Incorporating Hepatic Transporter-Mediated Clearance01:07

Physiological Pharmacokinetic Models: Incorporating Hepatic Transporter-Mediated Clearance

Drug transporters are critical in drug absorption, distribution, and excretion processes. They should be included in physiological-based pharmacokinetic (PBPK) models, which help predict human drug disposition. However, predicting this is challenging during drug development, especially when liver transport is involved. However, with a realistic representation of body transport processes, an accurate model may be possible.
A recent model describes pravastatin's hepatobiliary excretion, mediated...
Viral Hepatitis I: Introduction01:28

Viral Hepatitis I: Introduction

Viral hepatitis is an inflammatory condition of the liver caused by infection with hepatotropic viruses, most commonly hepatitis A, B, C, D, and E. Despite variations in structure and transmission, all viruses mentioned infect hepatocytes and provoke immune responses that can hinder liver function. Additionally, some non-hepatotropic viruses can also lead to hepatic inflammation.Hepatitis A VirusHepatitis A virus (HAV) is transmitted through the fecal–oral route, typically by ingestion of food...
Effect of Hepatic Disease on Pharmacokinetics: Drug Dosing and Hepatic Blood Flow01:26

Effect of Hepatic Disease on Pharmacokinetics: Drug Dosing and Hepatic Blood Flow

Chronic liver disease significantly impacts drug metabolism due to alterations in hepatic blood flow and enzyme accessibility. This disruption affects the body's pharmacokinetics—the movement and processing of drugs within the system. Key enzymes crucial for metabolizing medications become less accessible, changing how drugs are processed and utilized. Furthermore, liver disease influences the synthesis of plasma proteins, such as albumin and globulins, which play critical roles in drug binding...
Effect of Hepatic Disease on Pharmacokinetics: Active Drug, Metabolite and Fraction of Metabolized Drug01:14

Effect of Hepatic Disease on Pharmacokinetics: Active Drug, Metabolite and Fraction of Metabolized Drug

In pharmacotherapy, monitoring drug concentrations is paramount, especially for drugs whose therapeutic effects hinge on both the active compound and its metabolite. Hepatic impairment profoundly influences drug potency by altering liver function. If the drug is more potent than its metabolite, impaired liver function amplifies drug activity due to elevated drug concentration levels. Conversely, if the metabolite holds greater potency, diminished liver function diminishes drug activity by...

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A Protocol for Analyzing Hepatitis C Virus Replication
13:04

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Published on: June 26, 2014

On fractional order models for Hepatitis C.

E Ahmed1, H A El-Saka

  • 1Mathematics Department, Faculty of Science, Mansoura University, 35516, Mansoura, Egypt. magd45@yahoo.com.

Nonlinear Biomedical Physics
|March 19, 2010
PubMed
Summary

This study introduces a fractional order model for hepatitis C virus (HCV) dynamics, incorporating an immune response. Fractional calculus offers a more accurate approach to modeling complex biological systems like HCV infection.

Area of Science:

  • Mathematical Biology
  • Virology
  • Immunology

Background:

  • Hepatitis C virus (HCV) infection poses a significant global health challenge.
  • Existing mathematical models often use integer-order differential equations to describe disease dynamics.
  • The complex interplay of viral replication and immune response in HCV requires sophisticated modeling approaches.

Purpose of the Study:

  • To present a fractional order generalization of the Perelson et al. basic hepatitis C virus (HCV) model.
  • To incorporate an immune response term into the fractional order HCV model.
  • To highlight the suitability of fractional calculus for modeling complex biological systems.

Main Methods:

  • Development of a fractional order mathematical model for HCV.

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  • Inclusion of an immune response term to represent basic immune system properties.
  • Analysis and discussion of the proposed fractional order model.
  • Main Results:

    • The fractional order model provides a more nuanced representation of HCV dynamics compared to integer order models.
    • The incorporated immune response term captures essential aspects of the host's defense against HCV.
    • The study demonstrates the utility of fractional calculus in modeling biological systems.

    Conclusions:

    • Fractional order differential equations are advantageous for modeling complex biological systems, including HCV.
    • The inclusion of an immune response term is crucial for understanding the long-term behavior of HCV infection.
    • This generalized model offers a valuable tool for further research into HCV pathogenesis and control.