When undergoing surgery, red-haired people need anesthesia or take pain medicine at a higher dose than those with dark hair, according to research by British experts.
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Doctors often combine local anesthesia, inhalation anesthesia, anesthesia by intravenous injection to create a standard balance in surgery.
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According to scientists at the University of Gothenburg (Sweden), multiple anesthesia can cause loss of many brain stem cells, impairing memory and learning ability in children.