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Effect of Ambulatory Oxygen on the Walking Test in Patients With Pulmonary Fibrosis

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT02668029
Recruitment Status : Completed
First Posted : January 29, 2016
Last Update Posted : January 29, 2016
Information provided by (Responsible Party):
Piersante Sestini, University of Siena

Brief Summary:
Patients with pulmonary fibrosis often desaturate on exercise. There are no data showing whether ambulatory oxygen can be useful to improve exercise capacity in this condition. Ambulatory ambulatory oxygen is often denied to these patients based on studies conducted on patients with chronic obstructive pulmonary disease, a completely different condition for physiopathology, prognosis, and response to therapy. We therefore planned a controlled study to verify the usefulness of ambulatory oxygen in patients with pulmonary fibrosis

Condition or disease Intervention/treatment Phase
Pulmonary Fibrosis Drug: oxygen Drug: medical air Phase 2

Detailed Description:

Criteria for inclusion: Patients with a diagnosis of pulmonary fibrosis of any kind, with oxygen saturation >90% in ambient air at rest, showing a desaturation <88% during a preliminary 6 minutes walking test Criteria for exclusion: Inability to give consent, age <18 or >85 years, walking problems from causes different from pulmonary disease


In a preliminary session, the flow of oxygen needed to prevent desaturation during walking is established according to a validated protocol Guyatt et al, Am J Respir Crit Care Med 2001,163:,942-946.) Two 6 minutes walking tests are then performed in a corridor, at least 30' apart, during administration of oxygen or medical air, in random order and double blind, at the same pre-determined flow, administered through a nasal cannula connected to a wall outlet (concealed from sight, being in a side rum at about mid distance in the corridor) through a 10 mt plastic tubing. Oxygen saturation and pulse rate are monitored through a dedicated recording oximeter (Minoxy, Cosmed) , whose display is concealed to both the patient and the operator, with an alarm set for oxygen saturation <70%, to stop the test in case severe desaturation would occur Data are then transferred to computer for analysis only after both test are performed. Walked distance is recorded by the operator unaware of treatment.

At the end of each test, a short questionnaire is administered with 10 cm Visual Analogue Scales (VAS) for dyspnoea, fatigue, and preference compared to performing the test without any treatment. At the end of the second test a further scale is submitted, asking about the preference between the two treatments.

Primary outcomes are the distance walked and the difference in preference of the two treatments compared o no treatment. Secondary outcomes are differences in minimal saturation level and maximal pulse rate during the test and in the report of dyspnea and fatigue at the end of the test, and the reported preference between the two treatments.

Statistical analysis to evaluate the effect of the treatment on walking distance, heart frequency and oxygen saturation is performed using generalized linear model with a gaussian family and identity link and including order of treatment as a fixed effect. Parameters evaluated using VAS are analyzed using Koch adaptation of Wilkoxon rank test (Senn SS. Cross-over Trials in Clinical Research, 2nd Edition. Wiley 2002)

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 32 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Supportive Care
Official Title: Effect of Ambulatory Oxygen on the Walking Test in Patients With Pulmonary Fibrosis Normoxemic at Rest Who Desaturate on Exercise
Study Start Date : April 2012
Actual Primary Completion Date : April 2013
Actual Study Completion Date : April 2013

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: oxygen
oxygen administered through a nasal cannula at a personalized, fixed flow
Drug: oxygen
information already included in arm/group descriptions.
Other Name: ambulatory oxygen

Placebo Comparator: medical air
Medical air administered through a nasal cannula at the same flow
Drug: medical air
Other Name: Placebo

Primary Outcome Measures :
  1. distance walked [ Time Frame: end of test (6 minutes) ]
    recorded by operator

  2. Difference in preference of the two treatments compared to no treatment. [ Time Frame: end of test (6 minutes) ]
    VAS scale

Secondary Outcome Measures :
  1. Difference in oxygen saturation level [ Time Frame: Walking test (6 min) ]
    Digitally recorded

  2. Difference in heart rate [ Time Frame: Walking test (6 min) ]
    Digitally recorded

  3. Difference in dyspnea at the end of test [ Time Frame: End of test (6 min) ]

  4. Difference in fatigue at the end of test [ Time Frame: End of test (6 min) ]

  5. Preference between the two treatments [ Time Frame: End of both tests (45 min) ]

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 85 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Pulmonary fibrosis of any cause
  • Oxygen saturation => 90% at rest in ambient air, and <88% during walking test

Exclusion Criteria:

  • Inability to give consent
  • Walking impaired by any condition except pulmonary disease

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT02668029

Sponsors and Collaborators
University of Siena
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Principal Investigator: Piersante Sestini, MD University of Siena
Additional Information:
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Responsible Party: Piersante Sestini, associate professor, University of Siena Identifier: NCT02668029    
Other Study ID Numbers: WalkO2
First Posted: January 29, 2016    Key Record Dates
Last Update Posted: January 29, 2016
Last Verified: January 2016
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Keywords provided by Piersante Sestini, University of Siena:
Oxygen therapy
Additional relevant MeSH terms:
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Pulmonary Fibrosis
Pathologic Processes
Lung Diseases
Respiratory Tract Diseases