This can happen if the anesthesiologist administers a muscle paralyzing agent but forgets to administer the anesthetic agent. This is extremely unlikely to happen using modern anesthesia as the anesthesiologist relies on several different mechanisms to ensure that the patient is asleep and not only paralyzed. They utilize intravenous medications in addition to inhalational gases to maintain anesthesia and prevent this from occurring. This has been frequently reported in the movies, however, it is extremely infrequent in real life.
It is a known complication during general anesthesia. The incidence of awareness under anesthesia is variable. Usually it is rare; it depends on the surgical setting and the physiological status of the patient. For example, it is more frequent during anesthesia for traumatized people where the condition of the patient does not permit us to administer enough doses of anesthetics.
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It is recommended that all individuals see a Family Doctor for a full medical examination annually. Adults should get their blood pressure checked (US Preventive Task Force), a flu vaccine (CDC) and more each year.