Ultrasound, Central venous catheterization, Bronchoscopy, Hemodialysis catheter insertion, Lumbar puncture, Endotrachea...l intubation, Percutaneous tracheostomy, Arterial line placement, Stroke, Guillain Barre syndrome, Autoimmune encephalitis, Subarachnoid hemorrhage, Intracerebral hemorrhage, Brain death, Status epilepticus, Meningoencephalitis