Use of EtCO2 as a PaCO2 Predictor Under Non Invasive Ventilation (NIV) in Cases of Acute Hypercapnic Respiratory Failure

Use of EtCO2 and Prolonged Expiratory Maneuvers as a PaCO2 Predictor in Cases of Acute Hypercapnic Respiratory Failure

In patients treated by Non invasive ventilation (NIV) due to acute hypercapnic respiratory failure, the interest of using the End-tidal Co2 measurement device "Capnostream" to evaluate PaCo2 and PaCo2 variations over time will be evaluated. Measurements will be done under normal expiration and under prolonged active and passive expiration maneuvers.

Inclusion Criteria:

• ICU patient equipped with arterial line
• NIV requirement
• Hypercapnia: PaCO2 > 45mmhg

Exclusion Criteria:

• Severe hemodynamic instability
• Severe psychiatric disorders
• nasal lesions
• denied consent