The effects of 60 to 90 minutes of low blood oxygen reported as low as the mid 70% range, would normally be inconsequential, for an individual with a
normalNormal saline flush cardiovascular system.
That this should occur, however, with the use of bi-level positive airway
pressurePressure ulcer (BiPAP) device, suggests that the BiPAP settings or your oxygen flow rate are sub-optimum.
You will need to have this checked in the sleep lab.
Regards,
Curt