The aim of this study is comparison of effects of intrathecal Fentanyl and Bupivacaine with Sufentanyl plus Bupivacaine on duration of post-operative pain and side effect in elective caesarean section. Inclusion criteria: ASA class 1 & 2: Age between 15-45 years old: Height between 150-170 centimeters
Exclusion criteria: Time of operation lasts more than 1.5 hours; Intraoperative bleeding more than 1500 cc; the patient's inability to keep immobility during blocks. 90 patients randomly divided in 3 groups. All patients undergoing intrathecal anesthesia with Bupivacaine. Additionally group F receive Fentanyl, group S receive Sufentanyl and group P injected placebo. During surgery patients will monitor by pulse oximetry, non-invasive barometer and ECG. Blood pressure, heart rate, nausea, vomiting, itching, drowsiness, respiratory depression and Apgar score, sensory block level, motor block level; recovery of sensory block to T10, reversible motor block, pain and shivering and patient satisfaction assessment is evaluated.