If an alternative mask is utilized, having a mask exhaust valve 62 , the stimulus is directed to the patient will provide a reminder for the patient to check whether {TAIL ~ the exhaust valve} 62 is blocked against a pillow or {HEAD ~ clothing} 
If an alternative mask is utilized , having a mask exhaust valve 62 , the stimulus is directed to the patient will provide a reminder for the patient to check whether { TAIL ~ the exhaust valve } 62 is blocked against a pillow or { HEAD ~ clothing }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD