Embolism, AirDecompression SicknessBarotraumaDivingPulmonary EmbolismShock, SurgicalAirIntracranial EmbolismPneumoperitoneum, ArtificialEmbolism, FatEmbolismHyperbaric OxygenationBlood Gas AnalysisEmbolism, ParadoxicalGasesIntracranial Embolism and ThrombosisEmbolism, Amniotic FluidCerebral ArteriesCerebral InfarctionEmbolism, CholesterolVenous ThrombosisCerebrovascular CirculationEmbolectomyCerebral PalsyVentilation-Perfusion RatioMiddle Cerebral ArteryAir PollutantsAnticoagulantsAir PollutionCerebral Angiography