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Drug Concentration Versus Time Correlation

Drug Concentration Versus Time Correlation

The plasma drug concentration-time curve is a crucial tool in pharmacokinetics, representing the drug's concentration in plasma at different time intervals post-administration. This curve illustrates the drug's journey from absorption into the systemic circulation, distribution to body tissues, and eventual elimination through excretion or biotransformation.
Two pivotal parameters are the minimum effective concentration (MEC) and the minimum toxic concentration (MTC). The MEC is the lowest drug...

Pharmacokinetic–Pharmacodynamic Relationship: Influence of Elimination Half-Life on Effect Duration

Pharmacokinetic–Pharmacodynamic Relationship: Influence of Elimination Half-Life on Effect Duration

Drug elimination from the body primarily occurs through metabolic and excretion pathways. Hepatic metabolism transforms lipophilic drugs into hydrophilic forms for excretion, typically via enzymatic processes classified as phase I (modification) and phase II (conjugation). Renal excretion eliminates drugs and metabolites through filtration and secretion in the kidneys. Impairment in liver or kidney function can hinder these processes, delaying drug clearance and extending the drug’s half-life.

Noncompartmental Analysis: Mean Transit, Absorption and Dissolution Time

Noncompartmental Analysis: Mean Transit, Absorption and Dissolution Time

When drugs are administered extravascularly, a comprehensive evaluation through noncompartmental analysis becomes imperative. This analytical approach considers various parameters that play a crucial role in understanding the pharmacokinetics of these drugs.
One of the key parameters is the mean transit time (MTT), which refers to the total duration required for drug molecules to transit through the body. MTT is determined by calculating the ratio of the area under the moment curve to the area...

Noncompartmental Analysis: Mean Residence Time

Noncompartmental Analysis: Mean Residence Time

According to statistical moment theory, mean residence time (MRT) is an important measure in pharmacokinetics. MRT can be defined as the expected mean of a probability density function distribution. It provides valuable insights into drug disposition in the body.
After the administration of a drug through intravenous bolus injection, the drug molecules are distributed throughout the body and remain there for varying periods. The MRT represents the average time these drug molecules stay in the...

Pharmacokinetic–Pharmacodynamic Relationship: Duration of Dose-Effect Relationship

Pharmacokinetic–Pharmacodynamic Relationship: Duration of Dose-Effect Relationship

For drugs producing a quantal response, onset occurs when plasma concentration reaches a minimum effective level (Cmin). The drug's action duration depends on how long the plasma concentration remains above Cmin.Two primary factors influence this duration: dose size and the rate of drug removal from the action site. Both depend on the drug's redistribution to poorly perfused tissues and elimination processes. A larger dose promotes rapid onset and prolongs the effect's duration.Consider a...

Time Course of Drug Effect

Time Course of Drug Effect

The progression of a drug's impact can be analyzed by examining both the concentration-time course and the effect-time course. The concentration-time course is determined by the drug's half-life and is influenced by factors such as its pharmacokinetics, including absorption, distribution, metabolism, and elimination. The effect of the drug is often related to its concentration in the plasma and is calculated using the maximum drug effect and the plasma concentration that generates 50 percent of...

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Related Experiment Video

Updated: Jul 5, 2026

Contrast Ultrasound Targeted Treatment of Gliomas in Mice via Drug-Bearing Nanoparticle Delivery and Microvascular Ablation

Contrast Ultrasound Targeted Treatment of Gliomas in Mice via Drug-Bearing Nanoparticle Delivery and Microvascular Ablation

Published on: December 15, 2010

Treatment time.

Charles Chazot¹, Guillaume Jean

¹Centre de Rein Artificiel, Tassin, France.

Contributions to Nephrology

|May 3, 2008

Summary

This summary is machine-generated.

Longer hemodialysis (HD) sessions, three times weekly, improve patient survival, tolerance, and control of blood pressure, nutrition, and phosphate levels. This strategy offers significant clinical and economic benefits compared to conventional HD.

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Contrast Ultrasound Targeted Treatment of Gliomas in Mice via Drug-Bearing Nanoparticle Delivery and Microvascular Ablation

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Area of Science:

Nephrology
Renal Medicine
Dialysis Therapy

Background:

Hemodialysis (HD) session duration is a debated topic, yet three weekly sessions remain standard.
Dialysis adequacy encompasses survival, tolerance, blood pressure, nutrition, and phosphate control.

Purpose of the Study:

To evaluate the impact of long hemodialysis sessions on key indicators of dialysis adequacy.
To compare the efficacy of long HD sessions with conventional approaches.

Main Methods:

Analysis of recent data, including large-scale studies like DOPPS.
Focus on the relationship between HD session length, ultrafiltration (UF) rate, and clinical outcomes.

Main Results:

Survival and session tolerance are linked to HD session length and UF rate.
Longer HD sessions reduce intradialytic hypotension and improve extracellular volume control.
Nutritional markers stabilize, and hyperphosphatemia significantly decreases with long HD sessions.

Conclusions:

Longer hemodialysis sessions (3x/week) enhance survival, tolerance, and control of major clinical markers.
This strategy presents a viable clinical and economic alternative to daily dialysis programs.