Cerebral air embolism should be considered in case of stroke symptoms during any invasive procedure. Transport to a hospital with neurosurgical/hyperbaric oxygen treatment (HBOT) facility could improve the outcome for the patient. Absence of air on computed tomography (CT) scan should not disqualify a patient from HBOT if air embolism is suspected.
Kjellberg, Nystr�m, S�derberg, Dlugosz, J�rnvall, Steinberg, , , (2018). Massive air embolism as a complication of upper gastrointestinal endoscopy: A case report illustrating a stroke mimic, literature review, and suggested management. Clinical case reports, 2018 Sep;6(9):1862-1867. https://www.ncbi.nlm.nih.gov/pubmed/30214779