Study: NCT04741659

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: Ventimask
Description: The patients will be asked to breathe spontaneously using their actual low oxygen flow

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: Ventimask
Description: The patients will be asked to breathe spontaneously using their actual low oxygen flow

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: Ventimask
Description: The patients will be asked to breathe spontaneously using their actual low oxygen flow

Intervention type: DEVICE
Group type: PLACEBO_COMPARATOR
Intervention: Ventimask
Description: The patients will be asked to breathe spontaneously using their actual low oxygen flow

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: High Flow Nasal cannula (HFNC)
Description: The patients will be asked to breathe using high flow nasal cannula (HFNC). Air flow will set up to 60 l/m, temperature according to patient's comfort and FiO2 in order to obtain SpO2 values \>/= 92%

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: High Flow Nasal cannula (HFNC)
Description: The patients will be asked to breathe using high flow nasal cannula (HFNC). Air flow will set up to 60 l/m, temperature according to patient's comfort and FiO2 in order to obtain SpO2 values \>/= 92%

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: High Flow Nasal cannula (HFNC)
Description: The patients will be asked to breathe using high flow nasal cannula (HFNC). Air flow will set up to 60 l/m, temperature according to patient's comfort and FiO2 in order to obtain SpO2 values \>/= 92%

Intervention type: DEVICE
Group type: PLACEBO_COMPARATOR
Intervention: High Flow Nasal cannula (HFNC)
Description: The patients will be asked to breathe using high flow nasal cannula (HFNC). Air flow will set up to 60 l/m, temperature according to patient's comfort and FiO2 in order to obtain SpO2 values \>/= 92%

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: Helmet CPAP
Description: The patients will be asked to breathe with Helmet. CPAP will set at 10 cmH2O and FiO2 in order to obtain SpO2 values \>/= 92%

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: Helmet CPAP
Description: The patients will be asked to breathe with Helmet. CPAP will set at 10 cmH2O and FiO2 in order to obtain SpO2 values \>/= 92%

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: Helmet CPAP
Description: The patients will be asked to breathe with Helmet. CPAP will set at 10 cmH2O and FiO2 in order to obtain SpO2 values \>/= 92%

Intervention type: DEVICE
Group type: PLACEBO_COMPARATOR
Intervention: Helmet CPAP
Description: The patients will be asked to breathe with Helmet. CPAP will set at 10 cmH2O and FiO2 in order to obtain SpO2 values \>/= 92%

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: Non Invasive Ventilation (NIV)
Description: the patients will be asked to breathe with the support of a ventilator via a oro-nasal interface

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: Non Invasive Ventilation (NIV)
Description: the patients will be asked to breathe with the support of a ventilator via a oro-nasal interface

Intervention type: DEVICE
Group type: ACTIVE_COMPARATOR
Intervention: Non Invasive Ventilation (NIV)
Description: the patients will be asked to breathe with the support of a ventilator via a oro-nasal interface

Intervention type: DEVICE
Group type: PLACEBO_COMPARATOR
Intervention: Non Invasive Ventilation (NIV)
Description: the patients will be asked to breathe with the support of a ventilator via a oro-nasal interface