Figure 1. Flowchart of study perioperative anaesthetic protocol of low emetogenicity for minor gynaecological day surgery.

No prophylactic anti-emetics were given pre and intraoperatively. Total intravenous anaesthesia (TIVA) using an intravenous (IV) target controlled infusion (TCI) of propofol, was administered using a propofol infusor (Asena PK Syringe Pump, Carefusion USA). The infusor was pre-programmed with the Marsh algorithm [18], which computed propofol dosing rates to attain a target perioperative plasma propofol concentration of 4–6 ug/ml and 3–6 ug/ml in the induction and maintenance phase of anaesthesia respectively in every patient.