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Neuroanesthesia
Neuroanestesia is a type field of anesthesiology which focuses on neurosurgery. This is not used during awake brain surgery. Awake brain surgery will conduct for some procedures like removing some tumors or treating epileptic seizures.

History
Early forms of neuroanestesia were found during procedures of trepanning in Southern America like Peru. In these procedures coca leaves and datura plants were used to manage pain as the person had dull primitive tools cut open their skull. In 400 BC The physician Hippocrates made accounts of using different wines to sedate patients while trepanning. In 60 AD Dioscorides, a physician, pharmacologist, and botanist, detailed how mandrake, henbane, opium, and alcohol were used to put patients to sleep during trepanning. In 972 AD two brother surgeons,in modern day India,used “samohine” to sedate a patient while removing a small tumor and awoke the patient by pour onion and vinegar in the patients mouth. The most recent form of nueroanestesia is the combination of Carbon dioxide, hydrogen, and nitrogen. This was discovered in the 18t century by Sir Humphry Davy and brought into the operating room by Sir Astley Cooper.