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Evaluation of Lung Volume Under Nasal High Flow With a Time of Flight Camera (CamOpt)

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: NCT04096183
Recruitment Status : Completed
First Posted : September 19, 2019
Last Update Posted : November 20, 2019
Information provided by (Responsible Party):
University Hospital, Brest

Brief Summary:

The effectiveness of Nasal High Flow therapy (NHF), in comparison with conventional oxygen therapy, is based on Positive Expiratory Pressure (PEP) and washout of dead space.

Many authors have shown that peak expiratory pressure, expiratory plateau pressure, mean upper airway pressure and lung volume were significantly increased. It depends mainly on gas flow and mouth closure.

First, "Groves"showed in 2007 that mouth opening could vary nasopharyngeal pressure from 2.7 to 7.4 cmH20 to 60 L / min, like Parke did in 2009, with a pressure of 1.2 at 2.7 cmH2O at 35 L / min.

Then, "Parke" showed in 2011 and 2015, a nasopharyngeal pressure changing from 2.7 to 11.9 cmH20 by varying the flow rate from 30 to 100 L / min. "Bräunlich" also showed concordant results in 2018, from 1.6 to 2.3 cmH2O, changing flow rates from 20 to 40 L / min. "Corley" in 2011 found a pressure from -0.3 to 2.7 by passing from ambient air to high flow. "Okuda and Mauri's" work in 2017 on oesophageal pressures also contributed to this.

In addition, it has been proved that the Tidal Volume (TV) is proportional to the flow delivered. These measurements were carried out by impedancemetry, the results of which were extrapolated to Vt. Thus "Okuda" evaluated it at 685mL in ambient air and 968mL at 50L / min. In 2016, "Fraser" highlighted a TV increasing from 400 to 500 mL by increasing the flow rate to 30 L / min. "Parke" in 2015 described an exponential End Expiratory Lung Impedence (EELI) proportional to the flow rate, as did "Riera" in 2013 with a ratio of 1.26 between ambient air and NHF at 40 L / min, and "Corley" in 2011 (ratio of 1.25).

Actualy, Time-of-Flight (ToF) cameras, such as Kinect v2®, are increasingly used in the medical field, particularly to characterize respiratory movement.

Various authors have shown a good correlation between the values of TV obtained by spirometry (reference method) and those obtained with ToF camera. A study led in 2018, by "S. Nazir" in the Department of "Réanimation Médicale" at the University Hospital of Brest, evaluated the average errors less than 46mL, with 76% of measurements having an error less than 50 mL, which corresponds to the clinical limit.

Now having a non-invasive, safe, simple, reproducible, inexpensive, and allowing evaluation in clinical situations method ; the use of a Time-of-Flight camera to evaluate the breathing and its various parameters, is indicated.

In this innovative study, never performed in different respiratory conditions in vigilant patients with NHF, the lung volume will be evaluated by a Time-of-Flight camera.

Different clinical situations, and the different parameters influencing it, will be observed and compared with the results of previous studies.

These situations will be simulations ranging from a physiological state to an acute respiratory distress.

Condition or disease Intervention/treatment Phase
High Flow Nasal Time of Flight Camera Lung Volume Healthy Volunteers Other: Ventilation of healthy volunteers Not Applicable

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 10 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Other
Official Title: Evaluation of Lung Volume Under Nasal High Flow With a Time of Flight Camera
Actual Study Start Date : October 24, 2019
Actual Primary Completion Date : November 7, 2019
Actual Study Completion Date : November 7, 2019

Arm Intervention/treatment
Ventilation of healthy volunteers Other: Ventilation of healthy volunteers
Ventilation of healthy volunteers in different clinical situations

Primary Outcome Measures :
  1. Evaluation of the pulmonary volume change [ Time Frame: 3 hours ]
    Changes on the pulmonary volume in different situations during 3 hours.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy and Major Volunteers

Exclusion Criteria:

  • Nasopharyngeal obstruction, facial trauma, or other contraindication to the use of Nasal High Flow, pregnant woman, major incompetent, lack of consent.

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): NCT04096183

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CHRU de Brest
Brest, France, 29609
Sponsors and Collaborators
University Hospital, Brest
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Responsible Party: University Hospital, Brest Identifier: NCT04096183    
Other Study ID Numbers: 29BRC19.0070_CamOpt
First Posted: September 19, 2019    Key Record Dates
Last Update Posted: November 20, 2019
Last Verified: November 2019
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: Yes
Plan Description: All collected data that underlie results in a publication
Supporting Materials: Study Protocol
Time Frame: Data will be aviable for fifteen years following the final study report completion
Access Criteria: Data access requests will be reviewed by the internal committee of Brest UH. Requestors will be required to sign and complete a data access agreement.

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Studies a U.S. FDA-regulated Drug Product: No
Studies a U.S. FDA-regulated Device Product: No