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