Clinical trial NCT03917485: Bio Metrology of Nonfibrous Mineral Particles in Bronchoalveolar Lavage Fluids
Official title: Bio Metrology of Nonfibrous Mineral Particles in Bronchoalveolar Lavage Fluids
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Occupational Exposure
Lead sponsor: Centre Hospitalier Intercommunal Creteil
Sponsor class: OTHER
First posted: 2019-04-17
Enrollment: 105
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: yes
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: Subjects not exposed to Non-fibrous Mineral Particle in a professional and / or environmental way

Brief summary: The main purpose of this study is to update the pulmonary retention values of non-fibrous mineral particles in the general population.

This study will provide reference values for the interpretation and diagnosis of the cause of certain respiratory diseases potentially related to mineral particles.

Detailed description: Some non-fibrous mineral particles are responsible for respiratory or systemic diseases, most often of occupational origin. Their use concerns multiple professional sectors.

The bio metrology of these particles, namely their quantification in a biological medium requires reference values. These are essential for clinicians to interpret pulmonary retention in patients who may have been exposed professionally or environmentally to non-fibrous mineral particles.

A comparative study conducted in 2015 by lafp showed an increase in the particulate load of nonfibrous mineral particles, including titanium, in lung parenchyma samples over time.

Bronchoalveolar lavage fluid is typically considered to be representative of the lung for the analysis of nonfibrous mineral particles. The thresholds currently used for the bio metrology of nonfibrous mineral particles in bronchoalveolar lavage fluid samples are based on reference values established more than 20 years ago. It is therefore appropriate to update these reference values by establishing a new control population from the analysis of bronchoalveolar lavage fluid from subjects not exposed to the non-fibrous mineral particles in a professional or environmental manner.

Eligibility criteria: Inclusion Criteria:

* Subjects not exposed to Non-fibrous Mineral Particle in a professional and / or environmental way.
* Smokers and non-smokers (or weaners who have been weaned for at least 5 years).
* Acceptance to participate in the protocol.
* Affiliated to a social security scheme.

Exclusion Criteria:

* Suspicion of fibrosing pulmonary pathologies.
* Suspicion of pulmonary sarcoidosis ≥ stage 2, pneumoconiosis.
* Subjects with cystic fibrosis.
* Subjects chronic obstructive pulmonary disease (COPD) stage ≥ 3.
* Presence of serious comorbidities that are life-threatening in the short term.
* Refusal to participate in the study.

Primary outcomes:
measure: Number of non fibrous mineral particles in LBA (Bronchoalveolar lavage) (nombre of particles by ml)
timeFrame: 1 month
Secondary outcomes:
measure: Name of non fibrous mineral particles in LBA (Bronchoalveolar lavage) (nombre of particules by ml)
timeFrame: 1 month
measure: seize of non fibrous mineral particles in LBA (Bronchoalveolar lavage)
timeFrame: 1 month
Other outcomes:
Locations:
city: Créteil
country: France
facility: Centre Hospitalier Intercommunal de Créteil
Study officials:
References: