My mother, a stable stroke victim of 9 years, recently started wearing a CPAP machine. The CPAP technician suggested checking with an oxymeter to see if O2 was good, before increasing pressure. She first tested the left hand and it read fairly steady at 90 O2 / 70 pulse, but there were a few dips to 80 O2. Her left hand has been immobilized due to the stroke on the right side. So, she increased the pressure from 10# to 11# and redid the oxymeter test a few days later. This time she tested the right hand, which can be used, but has developed significant tremoring and contractions in the last 6 months, since coming off of long-time use of Benzotropine and Baclofen. This time on her right hand, the O2 would read 90 and pulse often at 70, but then there would be spikes of 160 - 180 pulse -- the longest being for 1/2 hour, and 70 O2. Mom cannot tell that her pulse is going that fast. Any thoughts? I am very concerned and have contacted her Primary Care doctor, who has not called yet. There is no visable signs of a difference.