Anesthesia induces temporary loss of sensation or awareness through analgesia, paralysis, or amnesia. It can be categorized as general anesthesia, which suppresses the central nervous system, or regional/local anesthesia, which block nerve impulses in a targeted area. The main purposes of anesthesia are hypnosis, analgesia, and muscle relaxation. Anesthesia drugs include intravenous drugs like thiopentone and propofol, inhalational drugs like nitrous oxide and isoflurane, and analgesic drugs like opioids and NSAIDs. Anesthesia is classified and coded based on the type administered and physical status of the patient.
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