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.
These types of anesthesia are not always clearly defined, and patients may progress from one level of sedation/anesthesia to a lighter or deeper level during the procedure. For this reason, the American Society of Anesthesiologists (ASA) considers anesthesia a continuum, from light sedation to general anesthesia.