For patients who have been prescribed a fixed pressure on a PAP device and have a V̇-Com device added to the circuit, a clinician may consider increasing the set fixed pressure by the pressure drop of the exhaust flow (found in the package insert of the interface). For example, if the exhaust flow of the patient’s mask is 30 Lpm at the fixed pressure, V̇-Com may decrease patient pressure by 0.6 cm H2O between breaths. The clinician may wish to increase the fixed pressure by 0.5-1.0 cm H2O or just observe and follow.