Positive airway pressure therapy for heart failure

Table 1 Summary of equipped functions of each type/mode of positive airway pressure

	CPAP	Bi-level PAP	VAPS	ASV
Positive end-expiratory pressure	+	+	+	+
Pressure support during inspiration	-	+	+	+
Guarantee of tidal volume or minute ventilation	-	-	+	-
Servo-control of ventilation	-	-	-	+
Automated control of pressure level during expiration	+	-	-	+
Backup ventilation	-	±1	+2	+2

¹Bi-level PAP devices that are only capable of spontaneous mode cannot provide back-up ventilation;

²Most devices automatically provide a set backup ventilation rate based on their VAPS or ASV algorithm. ASV: Adaptive servo-ventilation; Bi-level PAP: Bi-level positive airway pressure; CPAP: Continuous positive airway pressure; VAPS: Volume assured pressure support.