CPAP devices

Strumpf DA, Carlisle CC, Millman RP, et al. An evaluation of the Respironics BiPAP bi-level CPAP device for delivery of assisted ventilation. Respir Care 1990 35 415-422. 

CPAP (continuous positive airway pressure) device—A mask worn over the nose during sleep that constantly and gently pumps air through the nasal passages to prevent sleep apnea. 

There are three main types of ventilator circuits used for HMV Single circuits with a leak, single circuits with a valve, and double circuits with a valve. When used with NIV, it is important that the appropriate mask be used. Table 5 summarizes the important points associated with each type of circuit. Circuits with a leak are used for bi-level devices. The intentional leak and CO2 washout for a given pressure vary significantly depending on the manufacturer and the type of mask. There are many choices of masks for the leak circuit as these masks are also used for CPAP. We have already reviewed the issue of CO2 washout and concluded that this is not a major concern when using a nasal mask (20). The only type of mask where this might be of clinical concern is with a full-face mask. A fiill-face mask is... 

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