Scalp Block -Craniotomi

intraoperative Routine anesthesia induction will be applied after routine monitoring in the operating room. Anesthesia will be induced with propofol (1.5-2 mg/kg), rocuronium (0.6 mg/kg), fentanyl (1mcg/kg), 0.7 FiO2 oxygen. After intubation, general anesthesia will be maintained with the effect site model of target control infusion with propofol and remifentanil. Target concentrations will be maintained at 2 to 3 µg/ml propofol and 2 to 6 ng/ml remifentanil. The propofol dose was titrated according to the depth of anesthesia. The bispectral index will be kept between 45 and 60. Radial artery and urinary catheter will be inserted.

Group S: Following induction of anesthesia, a scalp block will be performed before the surgery begins.

Group I: Incisional infiltration will be performed before the surgery begins, following induction of anesthesia for the patient.

Scalp block: Scalp block will be performed by the anesthesiologist 10 minutes before the pin head holder application (PHHA). Supraorbital and supratrochlear nerves will be blocked bilaterally with 6 ml of 0.5% bupivacaine injected vertically into the skin above the eyebrow midline. Auriculotemporal nerves will be blocked bilaterally by injecting 4 ml of 0.5% bupivacaine 1.5 cm anterior to the ear at the tragus level. The needle will be inserted perpendicular to the skin and the fascia will be injected deeply and superficially while the needle is withdrawn. Postauricular branches of the greater auricular nerves will be blocked bilaterally with 2 ml of 0.5% bupivacaine injected 1 cm posterior to the ear, between the bone and skin, at the level of the tragus. The greater, lesser, and third occipital nerves will be blocked bilaterally with 8 ml of 0.5% bupivacaine injected along the upper nuchal line, approximately halfway between the occipital protuberance and the mastoid prominence.

Incisional infiltration: 20 ml of 0.5% bupivacaine will be infiltrated by the surgeon into the PHHA points and surgical incision areas 10 minutes before PHHA. If the mean arterial pressure (MAP) and heart rate increase above 20% of the baseline values in both groups, additional remifentanil 50 µg IV will be administered.

Intraoperative analgesia will be provided only with remifentanil. Sugammadex (2 mg/kg will be used to reverse the remaining muscle relaxation at the end of the surgery). Ondansetron (8 mg IV) will be administered as antiemetic prophylaxis. All patients will be extubated at the end of the surgery and will be admitted to the neurosurgery intensive care unit for 24 hours postoperatively.

Postoperative The per-operative analgesia plan will be applied the same to all patients. In this protocol, intravenous paracetamol 1 g. and tramadol was determined as 1mg/kg. Then it is paracetamol every eight hours and tramadol from PCA.

At the end of the operation, patients' pain levels will be determined and recorded using the Numeric Rating Scale (NRS) system at intervals in the first 24 hours postoperatively. NRS; It is a pain intensity determination system based on the system of having the person say a point between 0 (no pain), 10 (unbearable pain) and 10 (unbearable pain) to describe his/her pain. During service follow-ups, if NRS is 4 or above, 75 mg diclofenac sodium will be administered intramuscularly. Analgesia consumption amount, rescue analgesic needs and hours will be noted in detail, and rescue analgesic use as well as NRS scores at specified hours will be evaluated statistically. The postoperative analgesia plan will be applied the same to all patients. This protocol is our routine analgesia protocol that we apply in our hospital for cranial surgeries.