The vocabulary around non-invasive positive-pressure therapy is cluttered. CPAP, APAP, BiPAP, BiPAP-S, BiPAP-ST, AVAPS, iVAPS, ASV, home NIV, home ventilator — these labels refer to overlapping categories that a physician chooses between based on the specific clinical picture in front of them. For a patient or family trying to understand which mode is appropriate, the