Many people don’t realize lung volume changes during pregnancy. Fine if you’re healthy, not fine if you have existing lung disease.
Expiratory volume decreases, residual volume decreases, functional capacity decreases, etc anywhere from 5 to 25 percent depending on the value.
It’s def possible to intubate an awake ob patient, really difficult patients will require a video laryngoscope but it also depends in the type of anesthesia used for intubation. General anesthesia or failed awake intubation calls for the use of a video scope, generally.