[Table/Fig-2]:

Comparison of continuous positive airway pressure (CPAP) and automatic positive airway pressure (APAP) devices.

CPAP		APAP
Advantages	Limitations	Advantages	Limitations
Noninvasive	Increase of expiratory effort	Fluctuation between low and high level pressure on whole night and automatically adjusts the pressure level	APAP algorithm varies from one person to another
Immediate relief	Sense of forced air through the nostrils of the patient	Automatic elevation of pressure	During apnea events, sometimes the pressure change will be slow
Reduction of heart problems	Uniform maintenance of pressure level set by physician	Uniform maintenance of pressure level set by patient itself	More expensive