Pre-emptive Scalp Infiltration With Dexamethasone Plus Ropivacaine for Postoperative Pain After Craniotomy

All participates will receive an electronic intravenous patient-controlled analgesia (PCA) device in which the bolus dose of sufentanil will be set as 2 μg with a lockout interval of 10 min and the maximum dose will be limited as 8 μg per hour. If the participates feel inadequate analgesia after 5 times of sufentanil bolus, the bolus dose will be increased to 3 μg and the maximum dose will be increased to 12 μg per hour.

The number of participants who have not pushed the button of patient-controlled analgesia pump. Both of the initial dose and background infusion of the patient-controlled analgesia pump in this study will be set as 0. Participates will be advised to push the analgesic demand button if they feel pain.

The first time that the participants press the patient-controlled analgesia button.

The total times that participants press patient-controlled analgesia button including effective presses and ineffective presses.

Pain was assessed after surgery by a numerical rating scale (0 indicates no pain, 10 indicates the most severe pain imaginable).

Postoperative nausea and vomiting (PONV) was rated by participates as: 0, absent; 1, nausea not requiring treatment; 2, nausea requiring treatment; and 3, vomiting.

Ramsey 1: Anxious, agitated, restless; Ramsey 2: Cooperative, oriented, tranquil; Ramsey 3: Responsive to commands only If Asleep; Ramsey 4: Brisk response to light glabellar tap or loud auditory stimulus; Ramsey 5: Sluggish response to light glabellar tap or loud auditory stimulus; Ramsey 6: No response to light glabellar tap or loud auditory stimulus

Respiratory depression is defined as a respiratory rate less than 10 breaths per minute or oxygen saturation was less than ninety percent.

The criteria for treatment is determined by the participant's surgeon in charge.The times of emergency reducing blood pressure will be recording by the investigator.

0 for unsatisfactory, and 10 for very satisfied

Quality of life will be measured using the World Health Organisation QoL-BREF (WHOQOL-BREF) questionnaire. The WHOQOL-BREF is a abbreviated version of the WHOQOL-100 assessment. WHOQOL-BREF is a self-report questionnaire that contains 26 items and addresses 4 QOL domains: physical health (7 items), psychological health (6 items), social relationships (3 items) and environment (8 items). Two other items measure overall QOL and general health. Each domain's mean score can range between 4 and 20 and a higher score indicates a higher quality of life. The mean score of items within each domain is used to calculate the domain score. A transformation method converts domain scores to a 0-100 scale.

Including delayed incisional healing, incisional infection, intracranial infection, scar healing

Skin Healing

1: fully healed; 2: ≤3 cm in total not healed; 3: >3 cm not healed; 4: areas of necrosis ≤3 cm; 5: areas of necrosis >3 cm Infection

1: none; 2: ≤0.5-cm margin of redness; 3: more redness or superficial pus; 4: deep infection; not applicable Hair Regrowth

1: even regrowth along wound; 2: ≤3 cm not regrowing; 3: >3-6 cm not regrowing; 4: >6 cm not regrowing; not applicable

The Patient and Observer Scar Assessment Scale includes subjective symptoms of pain and pruritus and consists of 2 numerical numeric scales: The Patient Scar Assessment Scale and the Observer Scar Assessment Scale. It assesses vascularity, pigmentation, thickness, relief, pliability, surface area and overall opinion for a scar on a score of 1 (normal skin) to 10 (worst scar imaginable). and it incorporates patient assessments of pain, itching, color, stiffness, thickness, relief and overall opinion. Participants were asked to rate the severity of their scar compared to normal skin. The overall opinion scale score ranged from 1 (normal skin) to 10 (very different from normal skin).