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Anesthesia
Anesthesia is a state of controlled, temporary loss of sensation or awareness that is induced for medical purposes. It may include some or all of analgesia, paralysis, amnesia, and unconsciousness. A patient under the effects of anesthetic drugs is referred to as being anesthetized.
There are four main categories of anesthesia used during surgery and other procedures: general anesthesia, regional anesthesia, sedation (sometimes called "monitored anesthesia care"), and local anesthesia. Sometimes patients may choose which type of anesthesia will be used.