Bio Metrology of Nonfibrous Mineral Particles in Bronchoalveolar Lavage Fluids

Occupational Exposure Clinical Trial

— REACTIT  

Official title:

Bio Metrology of Nonfibrous Mineral Particles in Bronchoalveolar Lavage Fluids

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03917485
• Other study ID #: REACTIT
• Secondary ID: 2018-A00475-50
• Status: Completed
• Start date: December 5, 2018
• Est. completion date: June 2, 2023

Study information

• Verified date: September 2023
• Source: Centre Hospitalier Intercommunal Creteil
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial 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.

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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 105
• Est. completion date: June 2, 2023
• Est. primary completion date: June 2, 2023
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years and older

Eligibility

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.

Related Conditions & MeSH terms

• Occupational Exposure

Locations

Country	Name	City	State
France	Centre Hospitalier Intercommunal de Créteil	Créteil

Sponsors (1)

Lead Sponsor	Collaborator
Centre Hospitalier Intercommunal Creteil

Country where clinical trial is conducted

France, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Number of non fibrous mineral particles in LBA (Bronchoalveolar lavage) (nombre of particles by ml)	Quantitative analysis of Non Fibrous Mineral Particles on samples obtained from subjects selected free from any significant occupational or environmental exposure to Non-fibrous Mineral Particle.	1 month
Secondary	Name of non fibrous mineral particles in LBA (Bronchoalveolar lavage) (nombre of particules by ml)	Identification of particles	1 month
Secondary	seize of non fibrous mineral particles in LBA (Bronchoalveolar lavage)	seize of particles	1 month