Patients in Pisa will undergo thyroid gland surgery. In the protocol group anesthesia will be performed using an automated anesthesia delivery system; preoperative and intra-operative assessment of patients will be performed via video-conferencing from Montreal, which will also monitor and control anesthesia delivery via distant Internet connection - as supervision of functioning of the automated anesthesia delivery system. In the control group anesthesia will be performed in a standard fashion with manual control of the syringe pumps infusing anesthetics drugs.