Pilot Physiological Evaluation of an Investigational Mask with Expiratory Washout.

Study Results

Results pending

The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.

Basic Information

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Recruitment Status

RECRUITING

Clinical Phase

NA

Total Enrollment

32 participants

Study Classification

INTERVENTIONAL

Study Start Date

2024-05-06

Study Completion Date

2025-12-31

Brief Summary

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The goal of this pilot randomized cross-over study is to compare the effect of a full-face mask with expiratory washout to a conventional full face mask on non-invasive ventilation (NIV) in patients with acute hypercapnic, and acute hypoxemic, respiratory failure. The main questions it aims to answer are:

* Does a mask with expiratory washout improve minute ventilation in patients using non-invasive ventilation compared with a conventional single-limb NIV mask
* How does a mask with expiratory washout affect respiratory variables compared with a dual-limb NIV mask.

Participants already prescribed NIV will undergo 3 arms of the investigation in a randomized order:

* Single-limb NIV with investigation mask (with expiratory washout)
* Single-limb NIV with conventional mask
* Dual-limb NIV with conventional mask

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Detailed Description

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The investigational mask has been designed to deliver non-invasive ventilation (NIV) therapy with expiratory washout.

Expiratory washout is a technique designed to flush the upper airway of carbon dioxide at the end of expiration. During conventional NIV the gas at end of exhalation contributes to the functional dead space and "wasted" ventilation. The primary purpose of expiratory washout is to flush the upper airway with fresh gas during exhalation so the next supported breath which drives gas back into the alveolar regions has reduced carbon dioxide.

Patients that are admitted to hospital with acute (hypercapnic or hypoxemic) respiratory failure, as assessed by normal hospital protocols, and starting or prescribed to start NIV therapy will be considered for the investigation. Once stabilized on NIV by the physician in charge of their care, eligible patients will be assessed against the inclusion/exclusion criteria and enrolled into the study if applicable.

Participants that are enrolled into the study will be put onto oxygen therapy via nasal cannula for 15 minutes, during which time baseline measurements of physiological parameters (such as respiratory rate, tidal volume, minute ventilation and blood gases) and dyspnea scores will be recorded.

Following baseline measurements, 32 participants will be randomized into one of the 3 investigational arms and receive NIV with heated humidification according to the randomization protocol for 30 minutes each arm (90 minutes total). The same measurements will be recorded at the end of each 30-minute investigational arm. Participants will cross over to the other 2 conditions consecutively in a random order, each for 30 minutes.

The ventilator settings (press support ventilation (PSV), positive end expiratory pressure (PEEP)) will be the following: PSV for tidal volume comprised between 6 and 8 millilitres per kilogram (ml/kg) predicted body weight (PBW), a titration period will be planned at the beginning of the first study period to target a tidal volume of 7 +/-1 ml/kg PBW and the PSV level will be kept constant thereafter. PEEP will be set according to the physician in charge (between 5 and 10 centimetres of water (cmH2O)) if NIV was used before inclusion or will be set by the investigators between 5 and 10 cmH2O. The fraction of inspired oxygen will be titrated manually to target peripheral saturation of oxygen of 88-92% in patients with hypercapnia and 90-94% in patients without hypercapnia.

Once the investigation is complete, and participants have successfully finished all 3 arms of NIV therapy, the standard NIV protocols as per local hospital will resume, and participants will return to the care of their usual physician.

Conditions

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Acute Hypercapnic Respiratory Failure Acute Hypoxemic Respiratory Failure

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

CROSSOVER

Randomized Cross-Over study

Primary Study Purpose

TREATMENT

Blinding Strategy

SINGLE

Outcome Assessors

Study Groups

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Single-limb non-invasive ventilation with expiratory washout

In a random order, 30 minute period of non-invasive ventilation using the investigational mask, a vented full-face mask with expiratory washout

Group Type EXPERIMENTAL

Investigational full-face mask with expiratory washout

Intervention Type DEVICE

With cross-over in randomized order, mask worn for 30 minutes with prescribed single-limb non-invasive ventilation

Single-limb non-invasive ventilation

In a random order, 30 minute period of non-invasive ventilation with a conventional vented full-face mask (RT077 or equivalent)

Group Type ACTIVE_COMPARATOR

Conventional full-face mask - single-limb

Intervention Type DEVICE

With cross-over in randomized order, conventional mask such as RT077, worn for 30 minutes with prescribed single-limb non-invasive ventilation

Dual-limb non-invasive ventilation

In a random order, 30 minute period of non-invasive ventilation with a conventional vented full-face mask (RT076 or equivalent)

Group Type ACTIVE_COMPARATOR

Conventional full-face mask - dual-limb

Intervention Type DEVICE

With cross-over in randomized order, conventional mask such as RT076, worn for 30 minutes with prescribed dual-limb non-invasive ventilation

Interventions

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Investigational full-face mask with expiratory washout

With cross-over in randomized order, mask worn for 30 minutes with prescribed single-limb non-invasive ventilation

Intervention Type DEVICE

Conventional full-face mask - single-limb

With cross-over in randomized order, conventional mask such as RT077, worn for 30 minutes with prescribed single-limb non-invasive ventilation

Intervention Type DEVICE

Conventional full-face mask - dual-limb

With cross-over in randomized order, conventional mask such as RT076, worn for 30 minutes with prescribed dual-limb non-invasive ventilation

Intervention Type DEVICE

Other Intervention Names

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RT077 RT076

Eligibility Criteria

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Inclusion Criteria

* No indication of intubation upon evaluation by physician in the next 2 hours
* Fits the investigational mask

Specific for hypercapnic patients 1 of the following criteria

* Patients hospitalized with acute respiratory failure (ARF) stabilized and tolerating NIV or;
* Patient admitted to hospital with ARF with one criteria for NIV among the following:

* Acute hypercapnic respiratory failure with hypercapnia and acidosis (Partial pressure of arterial carbon dioxide (PaCO2) \> 45 millimeters of mercury (mmHg) and pH \< 7.38) or
* Post-extubation period within 48 hours, in patients with high risk of re-intubation

Specific for hypoxemic patients

1 of the following criteria

* Hypoxemic respiratory failure without hypercapnia requiring nasal high flow or;
* Hypoxemic respiratory failure without hypercapnia requiring NIV or;
* Conventional oxygen therapy (COT) \> 6 liters per minute (L/min) with peripheral oxygen saturation (SpO2) \< 92%

Exclusion Criteria

* Refusal to participate in the study
* Inability to provide informed consent
* Infectious isolation
* Facial deformity, burns or morphology that prevents adequate mask placement
* Claustrophobia
* Nausea
* Presence of nasogastric tube
* Pneumothorax
* Confusion or loss of consciousness
* Severe upper gastro-intestinal bleeding
* Any other condition, which at the investigators discretion, is believed may present a safety risk or impact the feasibility of the study or study results

Minimum Eligible Age

18 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

No