Anesthesia, or anaesthesia (see spelling differences; from Greek αν-, an-, "without"; and αἴσθησις, aisthēsis, "sensation"), has traditionally meant the condition of having sensation (including the feeling of pain) blocked or temporarily taken away. It is a pharmacologically induced reversible state of amnesia, analgesia, loss of responsiveness, loss of skeletal muscle reflexes and/or decreased stress response. This allows patients to undergo surgery and other procedures without the distress and pain they would otherwise experience. Another definition is a "reversible lack of awareness," whether this is a total lack of awareness (e.g. a general anesthetic) or a lack of awareness of a part of the body such as a spinal anesthetic or another nerve block would cause. The word was coined by Oliver Wendell Holmes, Sr. in 1846.Read more on Wikipedia
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