Saturations in the 70% range, while on a continuous positive airway pressure (
CPAP)
device, raise the question of the validity of the oximetric results and/or misapplication of the CPAP. You need to ask your doctor to interpret these findings. Also, sleep apnea does not cause shortness of breath while awake. On awakening from sleep in the night, in response to airway obstruction, it does give the sensation of shortness of breath.