This study aimed to the association of preanesthetic ANI scores and PIP in patients who scheduled for general anesthesia.~Before propofol administration in remifentanil group, preanesthetic ANI values (instant and mean) were checked after remifentanil to a target Ce of 4 ng/ml.~Control group received the same volume of saline as remifentanil group. Heart rate and bispectral index were checked as ANI. Point biserial correlation and ROC curve were analyzed.
Recently, Analgesia Nociception Index (ANI) has been evaluated for objectively measuring peri-operative pain and to guide intra-operative opioid administration during various surgeries.~Propofol injection pain (PIP) is a common problem and can be very distressing to the patient.