Can anesthestics injected via the neck vein cause immediate unconsciousness?
Yes, but it doesn’t matter what vein you use. The only major vein in the neck is the jugular, which is too deep to be an effective means for venipuncture. It also goes directly to the heart, which means that any insoluble media or adulterations in any IV solution will be much more dangerous than peripheral (arms, legs) IV administration. Arteries are only used for a few particular emergency IV applications because the blood pressure in the arteries is far too high and will cause serious localized trauma. An IV in the wrist is just as effective as anything else because of the incredibly rapid rate of blood circulation.
