A. Incorrect response: See explanation B.
B. Correct response: The Apta√©r heliox delivery system is available to deliver heliox with NPPV. It uses a premixed blend of heliox from a source gas cylinder and it delivers to a spontaneously breathing patient through a sealed face mask. The Apta√©r enables the therapist to adjust the level of pressure support (3 to 20 cm H2O), trigger sensitivity (0.1 to 1.5 cm H2O), rise time, and cycle sensitivity (5% to 75% of peak inspiratory flow). It incorporates a vibrating mesh nebulizer, but does not include an O2 blender or PEEP capabilities.
C. Incorrect response: See explanation B.
D. Incorrect response: See explanation B.