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Related Concept Videos

Drug Accumulation During Multiple Dosing: Intermittent IV Infusions01:24

Drug Accumulation During Multiple Dosing: Intermittent IV Infusions

Intermittent intravenous (IV) infusion is a method of drug administration where medications are delivered over short infusion periods followed by intervals of no drug delivery. This approach helps to prevent sustained high drug concentrations in the bloodstream, reducing the risk of adverse effects associated with prolonged exposure. Unlike continuous infusion, steady-state concentrations may not be achieved during a single dosing cycle but can be reached through repeated...
Bioavailability Study Design: Healthy Subjects Versus Patients01:15

Bioavailability Study Design: Healthy Subjects Versus Patients

Bioavailability studies are essential for evaluating a drug's therapeutic efficacy and understanding its absorption patterns under various physiological conditions. Conducting such studies on target patient populations provides more relevant data by simulating real-world disease states. However, practical challenges often necessitate the use of young, healthy adult volunteers as study subjects.Patients may exhibit altered drug absorption patterns due to the effects of the disease itself,...
Therapeutic Drug Monitoring: Affecting Factors01:29

Therapeutic Drug Monitoring: Affecting Factors

Therapeutic Drug Monitoring (TDM) is the clinical practice of measuring specific drug levels in a patient's blood or body tissues to manage and optimize therapy. TDM is crucial for drugs with narrow therapeutic windows, like warfarin and phenytoin, where incorrect doses can lead to treatment failure or severe side effects. This monitoring ensures the dosage administered is within a safe and effective range. The factors affecting therapeutic drug monitoring include:Patient-Specific Factors:a.
Bioavailability Study Design: Single Versus Multiple Dose Studies01:11

Bioavailability Study Design: Single Versus Multiple Dose Studies

Bioavailability studies are essential for understanding how a drug is absorbed, distributed, metabolized, and excreted in the body. These studies assess the extent and rate at which the active pharmaceutical agent becomes available at the site of action. The design of bioavailability studies can involve single-dose or multiple-dose regimens, each with distinct advantages and limitations.Single-dose studies are the preferred approach due to their simplicity and reduced drug exposure for...
Pharmaceutical Alternatives: Stability-Related Therapeutic Nonequivalence01:22

Pharmaceutical Alternatives: Stability-Related Therapeutic Nonequivalence

Generic intravenous (IV) drugs are considered bioequivalent to their branded counterparts due to their 100% bioavailability upon administration. However, variations in stability among different drug products can significantly influence their therapeutic performance, even if they are pharmaceutically equivalent.Cefuroxime, a prophylactic antimicrobial, is often used as a single-dose IV injection for patients undergoing coronary artery bypass grafting surgery. A 3 g dose typically provides...
Desensitization and Tachyphylaxis01:20

Desensitization and Tachyphylaxis

Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
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Related Experiment Video

Updated: Jun 2, 2026

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
04:53

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition

Published on: September 20, 2019

Premature discontinuation during the UPLIFT study.

Marc Decramer1, Geert Molenberghs, Dacheng Liu

  • 1Respiratory Division, University Hospital, University of Leuven, Herestraat 49, Leuven, Belgium. Marc.Decramer@uzleuven.be

Respiratory Medicine
|May 3, 2011
PubMed
Summary
This summary is machine-generated.

Patients discontinuing from COPD trials were more likely to receive placebo and have worse health. Understanding these factors is key for improving future clinical trial completion rates.

Related Experiment Videos

Last Updated: Jun 2, 2026

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition
04:53

A Clinical Trial Assessing the Safety, Efficacy, and Delivery of Olive-Oil-Based Three-Chamber Bags for Parenteral Nutrition

Published on: September 20, 2019

Area of Science:

  • Pulmonary Medicine
  • Clinical Trial Methodology
  • Respiratory Research

Background:

  • Placebo-controlled trials for Chronic Obstructive Pulmonary Disease (COPD) frequently experience premature participant discontinuation.
  • A clear understanding of the factors contributing to this discontinuation phenomenon is currently lacking.

Purpose of the Study:

  • To investigate and elucidate the reasons behind premature participant discontinuation in COPD clinical trials.
  • To identify patient characteristics and trial-related factors associated with study completion.

Main Methods:

  • Analysis of discontinuation patterns within the UPLIFT (Understanding Potential Long-Term Impacts on Function with Tiotropium) trial.
  • Logistic regression analysis to identify predictors of trial completion.

Main Results:

  • Premature discontinuation rates were significantly higher in the placebo group (45%) compared to the tiotropium group (37%).
  • Patients who discontinued typically had more severe COPD, higher pack-year history, poorer lung function (FEV1), and worse quality of life (SGRQ scores).
  • Non-completers exhibited greater declines in FEV1 and SGRQ over time, with increased risks of exacerbations and hospitalizations.

Conclusions:

  • Assignment to the placebo group is a significant predictor of premature discontinuation in COPD trials.
  • Patient factors including pulmonary function, health-related quality of life, smoking status, and demographic characteristics influence discontinuation.
  • The evolution of clinical variables during the trial is also linked to completion, highlighting the need for complete follow-up of all patients to accurately assess treatment efficacy.