The words tijera and tijeras can be used interchangeably in Spanish to refer to a single pair of scissors.
Both IV sedation (twilight) and general anesthesia are used commonly for cosmetic or plastic surgery. Regardless of technique, the patient's vital signs must be monitored, which include but not limited to heart rate, blood pressure, and breathing rate.
General anesthesia is, essentially, a medically induced coma, not sleep. Drugs render a patient unresponsive and unconscious. General anesthetics are normally administered intravenously (IV) or inhaled. Under general anesthesia, the patient is unable to feel pain and may also have amnesia. The drugs will be administered by an anesthesiologist, a specially trained doctor who will also monitor a patient's vital signs and rate of breathing during the procedure.