Thanks Arctickat. I can't take credit, though, that tip was passed on by an excellent college instructor.
J306, as far as briefly removing CPAP and patient compliance with CPAP, all my recent CHF calls have required intensive efforts to get the patient to keep the mask ON. It's quite uncomfortable, and I can understand why patients feel the large CPAP arrangement (filter, ETCO2, Boussignac valve, facemask, headstraps) is even more smothering than an NRB can seem to some anxious, hypoxic patient. Not to mention the unaccustomed positive pressure itself.