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NCT Number: NCT06238050

NOrmoBaric Oxygen Therapy Use In Critical Limb ISchemia

Peripheral arteriopathy disease (PAD) affects 1 million people in France. In its most advanced stage: chronic permanent ischemia also called critical ischemia, the prognosis of patients is burdened with a one-year mortality rate of 30%. Chronic permanent ischemia results from a lack of oxygen supply to the microcirculatory network, responsible for tissue death and the development of trophic disorders. In this context, many studies have focused on the contribution of hyperbaric oxygen therapy, however none demonstrates with certainty its beneficial effect with a heavy set-up for teams and patients. Furthermore, it appears that normobaric oxygen therapy could have its place in this context by temporarily restoring a sufficient level of transcutaneous oxygen. However, even if normobaric oxygen therapy is common practice although empirical for some practitioners, no data demonstrates its real interest. The purpose of this study is therefore to report the proportion, in usual practice, of patients with permanent chronic ischemia of the lower limb(s), benefiting from normobaric oxygen therapy, but also to show the interest of the contribution of this therapy in usual comprehensive management of these patients. This is a pilot study, after which, if the hypothesis is confirmed, it may be proposed to carry out a randomized study, on a large scale, in order to validate the use of normobaric oxygen therapy in the context of chronic permanent ischemia.

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Key information

Conditions

Critical Ischemia Limb Arterial Occlusive Diseases Arteriosclerosis Atherosclerosis Cardiovascular Diseases Chronic Disease Chronic Limb-Threatening Ischemia Disease Attributes Ischemia Pathologic Processes Pathological Conditions, Signs and Symptoms Peripheral Arterial Disease Peripheral Vascular Diseases Vascular Diseases

Age range

18 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

University Hospital, Angers, France

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About this study

In arterial pathology of the lower limbs at the stage of chronic permanent ischemia, very few data exist on the benefit of normobaric oxygen therapy in these patients. The purpose of the present study is to report the proportion in usual practice of patients benefiting from normobaric oxygen therapy and to show the interest of the contribution of this therapy in the usual global management of patients presenting with chronic permanent ischemia of the lower limbs.

Regarding the Wound, Ischemia, Foot Infection Score (WIfI score), it includes three sub-parts, each of which has a specific evaluation grid scoring between 0 and 3. From this evaluation grid, an overall score can be calculated with different interpretations to determine the risk of amputation at one year as well as the probability of improvement in the event of revascularization, ranging from very low risk to high risk. Nevertheless, the overall evaluation of the score could mask a significant improvement in one of the items evaluated, impacting the clinical management and the future of the patient. This is why, during this study, the improvement of each item of the WIfI score separately will be studied.

The hypothesis is that putting patients in chronic permanent ischemia on oxygen therapy, which is performed frequently, brings a medical benefit compared to patients who do not benefit from it.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Patient hospitalized in the recruiting centre.
  • Patient fulfilling the clinical and paraclinical criteria (resting TcpO2 values < 30mmHg) of the definition of chronic permanent ischemia with or without trophic disorders.

Exclusion criteria

  • Patient suffering from acute or decompensated heart or respiratory failure.
  • Patient suffering from chronic obstructive pulmonary disease (COPD) stage III or IV.
  • Patient with allergies to medical adhesives

Treatment and study plan

introduction of oxygen therapy or not

Procedure

During hospitalisation, surgeon decides if patient needs and will have an oxygen therapy during this hospitalisation and at home.

Primary outcomes

  1. Comparison of clinical characteristics of patients, whether or not they benefit from oxygen therapy in usual practices.

    Time frame: 6 months

    Determination of patients' characteristic with or without a prescription of oxygen therapy to inventorized clinical practices.

  2. Comparison of biological characteristics of patients, whether or not they benefit from oxygen therapy in usual practices.

    Time frame: 6 months

    Determination of patients' characteristics with or without a prescription of oxygen therapy to inventorized clinical practices.

Secondary outcomes

  1. Collection of all investigations carried out since inclusion and all modifications of medical therapy or implementation of surgical treatment.

    Time frame: 6 months

    Descriptive study of investigations and therapies (medical and surgical) carried out during the patient's follow-up period

  2. prevalence of decision-making parameters by using the sheet sent to the prescribing doctor by the patient.

    Time frame: 6 months

    Descriptive study of the parameter(s) which allowed the prescriber to make the decision to implement oxygen therapy.

  3. difference in the WIfI score items at inclusion and at 6 months.

    Time frame: 6 months

    Evaluation of the evolution of chronic permanent ischemia according to the administration in current practice of normobaric oxygen therapy.

  4. All-cause mortality at 6 months.

    Time frame: 6 months

    Evaluation of the evolution of chronic permanent ischemia according to the administration in current practice of normobaric oxygen therapy.

  5. occurrence of an amputation between one week after inclusion and 6 months.

    Time frame: 6 months

    Evaluation of the evolution of chronic permanent ischemia according to the administration in current practice of normobaric oxygen therapy.

  6. difference in score obtained at 1 month and at 6 months depending on the presence of chronic permanent ischemia or not and the administration of oxygen or not.

    Time frame: 1 and 6 month

    Assessment of the quality of life of patients suspected of chronic permanent ischemia using the Vascu-QOL-6 questionnaire

  7. Proportion of compliant patients in whom oxygen was prescribed on an outpatient basis

    Time frame: 1 and 6 month

    Evaluation of compliance with oxygen for patients benefiting from it

Study contacts

Contact information is provided by the study sponsor or research team.

Jeanne MD HERSANT, PhD

CONTACT

[email protected]

241353689 ext. +33(0)

Marine MAUBOUSSIN

CONTACT

[email protected]

668047430 ext. +33(0)

Sponsors and collaborators

Lead sponsor

University Hospital, Angers

Other Gov

Registry information

Acronym: NOBILIS

Important dates

Study start
2025
Primary completion
2026
Study completion
2026
First posted
Feb 2, 2024
Registry last updated
Jun 15, 2026

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

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This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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