20131209 Regulatory authorization is currently blocked at the ANSM.

The primary objective of this study is to evaluate the reproducibility of a method of measuring blood flow rates to the tracheo-bronchial mucosa using diluted dimethyl ether as a tracer.

Inclusion Criteria:

• The patient must have given his/her informed and signed consent
• The patient must be insured or beneficiary of a health insurance plan

Exclusion Criteria:

• The patient is under judicial protection, under tutorship or curatorship
• The patient refuses to sign the consent
• It is impossible to correctly inform the patient
• Patient is pregnant
• Patient is breast feeding
• The patient is a smoker
• The patient has, or has a history of, chronic respiratory insufficiency
• The patient has a contra-indication for a treatment necessary in this study