Study of the Physiology of the Asthma of the Obese Subjects. Breathing Obesity Asthma Study (BOA) (BOA)

September 17, 2013 updated by: Assistance Publique - Hôpitaux de Paris

Pathophysiological Study of Obesity-related Asthma

Asthma is more frequent in obese women, but the mechanisms underlying the causes of this increased frequency are unknown and are different from usual asthma pathophysiology (associated with allergy). Obesity is known to influence ventilation; our hypothesis is that the normal variability of ventilation is decreased in obese patients, and that this decrease is responsible for an increased reactivity of their airway to non specific stimuli. In this observational study, breathing variability will be studied using polygraphy (an investigation that is made in these women to detect nocturnal apneas), and airway reactivity is studied between pulmonary function tests that are made before bariatric surgery.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Detailed Description

Background : An increase in asthma prevalence (or asthma-like symptoms) has been established in obese subjects, especially women. The aim of this pathophysiological study is to evaluate whether the modifications of respiratory mechanics due to severe obesity (Body Mass Index [BMI]>35) may explain the increase in asthma prevalence. Our hypothesis is that a decrease in variability of tidal breathing (evaluated by the coefficient of variation of Tidal volume: CVTV) (which traduces a physiological response to the increased work of breathing) associated with a decrease in the frequency of deep inhalations (FDI) (physiological sighs). The bronchodilatory and bronchoprotective roles of these deep inhalations have been demonstrated. The avoidance of deep inhalations during 10 minutes in healthy subjects is responsible for a non specific transient airway hyperresponsiveness (AHR) to methacholine. Consequently, obesity-related asthma could be due to the loss of bronchoprotective effect of deep inhalations.

Aims: The aim of this study is to evaluate whether 1) the variability of their diurnal ventilation (based on the measurement of CVTV and FDI) in three groups of women: obese with AHR, obese without AHR and healthy non obese (main objective), 2) obesity-related asthma pathophysiology is linked to atopy, and 3) obese asthmatic women have a greater decrease in ventilation variability as compared to non asthmatic obese women (secondary objectives).

Methods: The prevalence of AHR and confirmed asthma (international clinical and functional definition) are determined based on pulmonary function test (spirometry, volume determinations, arterial blood gas, measurement of the resistance of the respiratory system with evaluation of the response to deep inhalation, methacholine challenge, exhaled NO measurement, nocturnal polygraphy and oeso-gastroscopy) results obtained from 150 obese (BMI > 35). The FDI and CVTV will be determined based on the tidal volume obtained from thoracic and abdominal plethysmography inductance measurements during the polygraphy. A nocturnal polygraphy is systematically done in these women to search for a Sleep Apnea Syndrome. 30 healthy (non asthmatic, normal exhaled NO value, BMI 18.5 to 25) women will constitute a control group. The size of the groups have been calculated based on literature data concerning the FDI and CVTV.

Analysis criteria: The prevalences of asthma (or asthma-like symptoms) and AHR will be of 30% and 50% (based on a personal preliminary study), respectively. The FDI and CVTV will be compared in obese women with and without AHR and in healthy women (primary objective), and subsequently in obese asthmatic women and obese non asthmatic women. The measurement of exhaled NO and the bronchomotor effect of deep inhalation will allow the determination of underlying pathophysiology of obesity-related asthma (secondary objective).

Perspectives: If our hypothesis is verified, obesity treatment will become part of the management of asthma in women.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Observational

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
204

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • France
      • Paris, France
        • Department of Physiology, Hôpital Européen Georges Pompidou

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 55 years (Adult)

Accepts Healthy Volunteers

Yes

Genders Eligible for Study

Female

Sampling Method

Non-Probability Sample

Study Population

obese with AHR, obese without AHR and healthy non obese

Description

Inclusion Criteria:

  • female
  • age>18 and < 55 years
  • BMI>35 (< 25 for healthy women)
  • planned bariatric surgery

Exclusion Criteria:

  • sleep apnea syndrome
  • pregnant or breast-feeding women
  • No affiliation or non beneficiary of the National Health Insurance

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort

Group / Cohort

A group or subgroup of participants in an observational study that is assessed for biomedical or health outcomes.
healthy volunteers
obese

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
compare the variability of the diurnal ventilation (based on the measurement of CVTV and FDI) in three groups of women: obese with AHR, obese without AHR and healthy non obese.
Time Frame: 24 hours
24 hours

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Time Frame
evaluate if the obesity-related asthma pathophysiology is linked to atopy, and if obese asthmatic women have a greater decrease in ventilation variability as compared to non asthmatic obese women
Time Frame: 24 hours
24 hours

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Assistance Publique - Hôpitaux de Paris

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: DELCLAUX MD Christophe, PhD, Department of Physiology, Hôpital Européen Georges Pompidou

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
January 1, 2008

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
June 1, 2010

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
November 1, 2010

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
December 19, 2007

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 19, 2007

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
December 20, 2007

Study Record Updates

Last Update Posted (Estimate)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
September 18, 2013

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
September 17, 2013

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
December 1, 2007

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • P061010

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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