Iraq- Afghanistan War Lung Injury Using 19F MRI (DIAL1001006)

There has been mounting evidence of respiratory problems related to military service in the
Middle East especially in the past two decades. An overview by Flavo et al. summarizes
studies not only of soldiers but evaluation of particulates from the Middle East in a number
of animal models. While there have been some 'prospective' studies based on use of a standard
evaluation protocol post deployment, the primary imaging modalities have been chest
radiograph (most read as normal) and chest high resolution computed tomography (HRCT),
neither of which have significant functional information. Standard pulmonary function testing
(e.g. spirometry, lung volumes, diffusing capacity, bronchoalveolar lavage, as well as
oscillatory resistance) were used in the STAMPEDE study, but only provide global functional
information. The case study by King et al. included lung biopsy in a sub-cohort (n = 49) of
soldiers with varying degrees of inhalation exposure during deployment. All biopsy samples
were abnormal and some were consistent with constrictive bronchiolitis. Constrictive
bronchiolitis is a non-reversible bronchiolar airway disease that is characterized by
fibrosis of the bronchioles and can be challenging to diagnose without biopsy (it is also
known by the term 'bronchiolitis obliterans'). The chest radiographs were normal in these
subjects although about 25% of chest CT showed 'air trapping' or 'centrilobular nodules'.
Pulmonary function testing in 39 soldiers with HRCT showed normal to near normal results in
32 of the subjects, with seven showing low diffusion capacity, obstruction and/or
restriction. Clearly, neither global measures of lung function nor high resolution anatomic
imaging are sensitive enough to avoid a biopsy to confirm diagnosis of constrictive
bronchiolitis. We hypothesize that measures of regional lung function should provide
additional information to aid in the diagnosis of WLI and may assist in the management of
more difficult or advanced cases of WLI.

This is an open label study in up to 10 subjects being evaluated for post war lung injury.
Each subject will receive up to 25 liters of inert perfluoropropane/oxygen gas mixtures as a
contrast agent to visualize the airway and alveolar spaces in their lungs using 19F magnetic
resonance imaging of inert gas/oxygen mixtures.

Inclusion Criteria:

- Subjects must meet all of the following inclusion criteria to be eligible for
enrollment into the trial

1. Outpatients of either gender, age > 18.

2. Willing and able to give informed consent and adhere to visit/protocol schedules.
(Consent must be given before any study procedures are performed.)

3. Women of childbearing potential must have a negative serum pregnancy test. This
will be confirmed before participation in this investigational protocol.

4. Subjects must have been deployed in Iraq and/or Afghanistan

5. Subjects must have a strong clinical suspicion of a diagnosis of constrictive
bronchiolitis based on clinical presentation and spirometry results

Exclusion Criteria:

- Subjects presenting with any of the following will not be included in the trial:

1. Unable to undergo a 3.0-Tesla MRI exam of the lungs and chest because of
contraindications (e.g. metal in the eye, claustrophobia);

2. Medical or psychological conditions which, in the opinion of the investigator,
might create undue risk to the subject or interfere with the subject's ability to
comply with the protocol requirements

3. Unable to receive gas mixture by breathing because of contraindications;

4. Other severe acute or chronic medical or psychiatric condition or laboratory
abnormality that may increase the risk associated with trial participation or may
interfere with the interpretation of trial results and, in the judgment of the
investigator, would make the subject inappropriate for entry into this trial.

Female; women at risk of pregnancy are required to have a confirmed negative urine
pregnancy test at Screening if of childbearing potential prior to the MRI scan