Clinical Trials About "Challenge" RSS

04:27 EST 12th December 2018 | BioPortfolio

We list hundreds of Clinical Trials about "Challenge" on BioPortfolio. We draw our references from global clinical trials data listed on and refresh our database daily.

More Information about "Challenge" on BioPortfolio

We have published hundreds of Challenge news stories on BioPortfolio along with dozens of Challenge Clinical Trials and PubMed Articles about Challenge for you to read. In addition to the medical data, news and clinical trials, BioPortfolio also has a large collection of Challenge Companies in our database. You can also find out about relevant Challenge Drugs and Medications on this site too.

Showing "Challenge" Clinical Trials 1–25 of 1,100+


Exercise Challenge in a Cold Chamber

The purpose of this study is to compare the exercise-challenge in a cold chamber at 2-4°C to the gold standard the metacholine challenge in subjects showing symptoms of exercise-induced bronchoconstriction. The sensitivity and repeatability of the exercise test will be measured.

Phase I Study to Determine the Optimal Human Challenge Dose for a Norovirus GII.4 Challenge Stock (CIN-1)

This is phase I, double blind, placebo-controlled safety and infectivity study of experimental human Norovirus genogroup GII.4 administered to healthy adults 18-49 years of age. Subjects susceptible to the human norovirus GII.4 challenge strain. The challenge study will be conducted in 2-3 cohorts of approximately 20 subjects each.Subjects will remain in the inpatient facility for at least four days following challenge and assessed daily for clinical and virologic evidence of n...

Aerosol BCG Challenge Trial in Healthy UK Adults

TB041 is a clinical challenge trial primarily to evaluate the safety of BCG challenge administered by the aerosol inhaled route in healthy, BCG naive UK adults. The trial will also look to evaluate and compare the amount of BCG recovered from the lungs and from the skin, following challenge by either the aerosol or the intradermal route.

Study Confirming A Human Challenge Model and Investigating The Safety Of VLA1701

This is a single-center, double-blind, placebo-controlled, Phase II vaccination and challenge study designed to confirm a human challenge model with E. coli strain LSN03-016011/A.

Adjusting Challenge-Skill Balance to Improve the Elderly's Quality of Life

The purpose of this study was to clarify the effects on health-related QOL of occupational therapy involving the adjustment of challenge-skill balance in the activity of elderly clients.

Response of Natriuretic Peptides to Glucose Challenge

The purpose of the study is to discover any racial dissimilarity in the response of Natriuretic peptide (NP) system to acute metabolic influences such as a high carbohydrate challenge

Bordetella Pertussis Colonisation Challenge Study

This is a prospective controlled human challenge study consisting of two phases; Phase A: Development of a B. pertussis human challenge model; pilot to establish the standard inoculum Phase B: Development of a modified B. pertussis human challenge model

Food Allergy Diagnostic Test Response to Previous Oral Challenge Response

The objective of this study is to compare the ocular response to CAC (using food allergen sensitive patients) to the systemic response of a previously performed oral food allergen challenge in the same subjects. This study will investigate the potential utility of CAC as a predictive tool for identifying patient response to food allergen challenge and maximum tolerated dose.

Methacholine Challenge: Comparison of Doubling and Quadrupling Methacholine Dose Regimes Using the Tidal Volume Method

The purpose of this study is to determine the difference (if any) in the result of the methacholine challenge (a test used by physicians in diagnosing asthma) when concentrations of methacholine are quadrupled versus doubled.

Safety of Bronchial Allergen Challenge and Predictors for Positive Reaction.

The present study is aimed to evaluate a bronchial allergen challenge with house dust mite and alternaria. Firstly, the years 2005, 2006, 2007, 2008 and 2009 will be retrospectively reviewed. Secondly, in 2010-2013, in the prospective part of the study the patients will undergo the bronchial allergen challenge to examine safety of the bronchial allergen challenge and change of allergen specific bronchial hyperreactivity before and after allergen specific immunotherapy.

Safety and Repeatability of Bronchial Challenge With Grass-pollen

The study is meant to establish a one-step challenge with grass-pollen in patients sensitized for grass-pollen. Therefore the investigators compare a multi-step challenge with grass-pollen with an one-step challenge in order to survey the repeatability and safety.

Mini-fluid Challenge in Predicting Fluid Responsiveness During Prone Position Spine Surgery

Perioperative fluid management is crucial for patients' outcome. Muller et al developed a "Mini-fluid challenge method " to predict fluid responsiveness and the efficacy. The investigators design the study to investigate the effectiveness of mini-fluid challenge test in prone position surgery.

AsthMatic Inflammation and Neurocircuitry Activation (MINA)

We have identified areas of the brain that are activated in response to disease-related emotional information, following whole lung allergen challenge in asthma. We propose that activity in these central nervous system locations, as measured by fMRI, is associated with the intensity of allergic inflammation, provoked by segmental bronchial challenge, in the absence of significant airflow obstruction. We predict that this relationship will be mediated by changes in expression of...

Hookworm Therapy for Coeliac Disease

This trial is a phase 2 multicentre, multinational, randomised, double-blinded, placebo-controlled, sequentially phased trial comparing the clinical efficacy and safety of two potential treatments for Coeliac Disease (CeD): (1) Gluten micro-challenge alone (following placebo infection), and (2) Gluten micro-challenge following infection with hookworm. Our 4 aims for the study are: Aim 1: To evaluate the efficacy of hookworm infection combined with escalating gluten ...

The Asthma Bronchial Challenge Study

This is a randomised, controlled, cross-over study to determine the effect of indirect bronchial challenge testing upon volatile organic compounds (VOCs) in the exhaled breath of adults with well-controlled, mild-to-moderate asthma. Participants will undergo baseline evaluation including clinical history, spirometry, exhaled nitric oxide measurement (FeNO), phlebotomy (blood eosinophil count), and sampling of exhaled breath VOCs. Participants will be randomised to receive eith...

To Evaluate Adenosine Monophosphate and Allergen Challenge in Allergic Rhinitis

Allergic rhinitis is a common condition characterize by inflammation of the upper airways. Third generation antihistamines have been demonstrated effective in the treatment of this condition. Allergen challenge can be use to assess the effects of drugs in allergic rhinitis, adenosine monophosphate may also be used as a means to investigate these effects but as yet its effects have yet to be compared to allergen challenge. We intend to compare the effects of levocetirizine at a ...

ATP/AMP Challenge in Healthy Non-Smokers, Smokers, Patients With Asthma, and Patients With Chronic Obstructive Pulmonary Disease (COPD)

In this randomised, cross-over, controlled study, a total of 84 subjects will be included: 12 healthy non-smoking volunteers; 12 current smokers; 30 patients with mild steroid-naïve asthma; and 30 patients with mild-moderate COPD. Each subject will have 1 screening visit (if necessary) and 2 study visits. At visits 2 and 3 the effects of adenosine 5`-triphosphate (ATP) or adenosine 5`-monophosphate (AMP) challenge, given in a random order, will be tested.

Shigella Sonnei 53G Challenge

Development of an S. sonnei human challenge model using a newly manufactured lyophilized lot of S. sonnei strain 53G (Lot 1794) that can be used in the future as a challenge strain for all S. sonnei vaccine candidates. An adaptable dosing plan will be used to determine the dose of Shigella sonnei 53G that induces the primary outcome in approximately 60% of subjects.

Optimal Human Dose for GII.2 Norovirus (Snow Mountain) Challenge Studies

This is a phase I, randomized, double blind, placebo-controlled safety, illness, and infection study of a new experimental human challenge stock of the Norovirus genogroup II, genotype 2 (GII.2) isolate designated Snow Mountain virus (SMV). The primary objectives are to evaluate the safety and reactogenicity of the norovirus GII.2 challenge stock and to determine a safe and optimal challenge dose of GII.2 Snow Mountain norovirus to achieve illness in a high proportion of subjec...

Reproducibility of Malaria Challenge in Healthy Volunteers

This is a prospective, single arm, single intervention safety and immunogenicity study in 6 healthy, malaria-naive adults, conducted to demonstrate the successful implementation of the well-established malaria challenge model at the Seattle Biomedical Research Institute (Seattle BioMed).

Microvascular Insulin Resistance and Mixed Meal Challenge

Insulin resistance (or pre-diabetes) is diagnosed using the oral glucose tolerance test. However, high blood glucose levels during this test may adversely impact on microvascular function. Investigators will determine whether a liquid mixed meal challenge (from carbohydrate, protein and fat) is a more appropriate test for assessing microvascular-derived insulin resistance.

Hepatic Blood Flow Changes During Fluid Challenge Assessed by MRI in Volunteers Subjects.

Hepatic artery and portal flows are both regulated to assume the whole hepatic blood flow. Each counts for respectively 25% and 75%. That so-called "buffer response" assumes that when portal flow increases, hepatic artery flow decreases. During fluid challenge in intensive care unit, fluid challenge is often administered to improve hepatic perfusion. That observation is not demonstrated. The aim of the study is to test buffer response and portal flow during fluid challenge.

Does the Response to a Minifluid Challenge of 3ml/kg in 2 Minutes Predict Fluid Responsiveness for Pediatric Patient?

To predict fluid responsiveness in anesthetized pediatric patient is not an easy task although anesthesia provider has to deal with this question on their daily practices. Today, very few parameters can help anesthesia provider to predict fluid responsiveness in the pediatric anesthetized patient. Therefore anesthesia provider are let with fluid challenge with high volume of fluid boluses to see if patient were fluid responsive or not. This could lead to fluid overload and it's...

The Effectiveness of Mini-fluid Challenge in Predicting Fluid Responsiveness During Video Assisted Thoracic Surgery

Perioperative fluid management is crucial for patients' outcome. Muller et al developed a "Mini-fluid challenge method " to predict fluid responsiveness and the efficacy. The investigators design the study to investigate the effectiveness of mini-fluid challenge test in video assisted thoracic surgery.

Does Venous pCO2 Increase by 20 mmHg or More During Apnea Challenge Test?

One required examination for declaration of death by neurological criteria is the apnea challenge test. The apnea challenge test evaluates the medulla brainstem respiratory center response to a rise in CO2. The current guideline requires arterial sampling of CO2 and therefore either arterial puncture or arterial catheter placement for the examination. Arterial catheter is an invasive monitoring device and is not without complications. Recent studies have demonstrated that there...

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