Superior Sagittal SinusSagittal Sinus ThrombosisCranial SinusesSinus Thrombosis, IntracranialCerebral VeinsDura MaterArachnoidMaxillary SinusCentral Nervous System Vascular MalformationsCerebrovascular CirculationVena Cava, InferiorIntracranial PressureParanasal SinusesCerebral AngiographyCavernous SinusSinus of ValsalvaDimenhydrinateOccipital BoneInferior ColliculiCarotid SinusFrontal SinusParanasal Sinus DiseasesSphenoid SinusCranial Fossa, AnteriorIntracranial Arteriovenous MalformationsIntracranial Embolism and ThrombosisPhlebographyTomography, X-Ray ComputedCoronary SinusMagnetic Resonance ImagingIntracranial HypertensionTrigeminal NerveVenous PressureIntracranial ThrombosisMagnetic Resonance AngiographySick Sinus SyndromeBrainEthmoid SinusCerebrospinal FluidAngiography, Digital SubtractionCerebral InfarctionCerebral HemorrhageEmbolization, TherapeuticParanasal Sinus NeoplasmsOxygenCatsDogsHeparinTachycardia, SinusMaxillary Sinus NeoplasmsCarbon DioxideMesenteric Artery, InferiorBlood Flow VelocityOxygen ConsumptionPilonidal SinusAnticoagulantsTransverse SinusesTime FactorsSheepFollow-Up StudiesSwineSinoatrial NodeMandibular NerveOlivary NucleusInferior Wall Myocardial Infarction