Correction of Exercise-induced Desaturation by Acute Oxygen Supply and Exercise Responses in COPD (RePox-1)

5 Santé

Status: Completed

Conditions: Oxygen/Therapeutic Use; Chronic Obstructive Pulmonary Disease

Study type: Observational

Funder types: Other

Identifiers

NCT02055885

Fvie_RePox-1

Details and patient eligibility

About

In the literature, the effects of acute oxygen administration on exercise tolerance and related symptoms have often appeared to be contradictory. Some investigations have reported benefits from acute oxygen supply during exertion, including increased exercise performance, reduced dyspnea, and better cardiorespiratory adaptations, whereas other studies have reported no improvement. Recently, we advanced then the hypothesis that some patients would be non-responders and even worsen under oxygen treatment. The preliminary results confirmed our hypothesis since we demonstrated that while 56% of the patients were improved with supplemental oxygen, 16% were non-responders and 28% were negative-responders (decreased performance and increased dyspnea during endurance exercise with supplemental oxygen). However, this was a pilot study offering preliminary insights and tentative conclusions that must be confirmed in a larger case series.

The aims of this retrospective study was :

1. To confirm on cohorte and with clinical test (the 6-minute walking test - 6WT) the deleterious responses to acute oxygen supplementation in LTOT (long terme oxygenotherapy treatment) and non-LTOT patients who exhibit exercise desaturation.
2. To identify the predictive factors among the clinical data (i.e., anthropometric, spirometric and gazometric data) and/or functional data recorded during rehabilitation program

Full description

During this study, a retrospective data collection will be carried out using the informations contained in the medical folders of patients admitted in our centers for pulmonary rehabiliation program.

We will select patients who meet the following criteria:

A) patients having two 6WT early in their program B) who desaturate (SpO2 <90% for 3 consecutive min) during the first 6WT and who will have been properly corrected with a supply of oxygen during the second walk test.

The analyzed parameters will be distance and dyspnea during the tests

Enrollment: 255 patients

Sex: All

Ages: 40 to 90 years old

Volunteers: No Healthy Volunteers

Inclusion and exclusion criteria

Inclusion Criteria:

• Obstructive airflow limitation defined by FEV1/CVF < 70% and FEV1 < 80 %
• Patients with or without long terme oxygenotherapy
• Patients exhibited during the first test, an exercise-induced desaturation, defined by SaO2 < 90% for 3 consecutive minutes during the 6-minute walking test in the air condition for non-LTOT or with the flow normally recommended during exercise for LTOT patients (i.e., flow rate of rest + 1L/min)
• Patients with no desaturation during the test with oxygen supply

Exclusion Criteria:

Trial design

255 participants in 2 patient groups

Positive responders

Description:

Positive responders (R+): patients exhibiting an increase in the 6WT distance ≥ 10% and/or a decrease in dyspnea ≥ 10% (i.e., ≥ 1 point on the visual analogue scale).

negative responders

Description:

Negative responders(R-): patients exhibiting a decrease in the distance ≥ 10% and/or an increase in dyspnea ≥ 10%.