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The use of opioids in intrathecal or epidural anesthesia has become popular to optimize postoperative analgesia. However, opioid-induced side effects, such as respiratory depression, nausea, vomiting, urinary retention and pruritus, limit their use. Several investigations have shown that intrathecal or epidural administration of opioids produces a dose dependent modulation of spinal nociceptive processing in animals and humans and is not associated with sedation. Aim of Study The purpose of this study was to assess the spinally mediated analgesic effects postoperativally of intrathecal Nalbuphine plus bupivacaine after lower abdominal surgeries in comparison to intrathecal bupivacaine plus fentanyl Patients &amp; Methods : 60 patients came to Ain-shams Hospital for lower abdominal surgeries, They were randomly allocated into two equal groups (30 patients each) group F and group N. Group F : Bupivacaine-Fentanyl Patients received an intrathecal injection of 3 ml of 0.5% heavy (hyperbaric) bupivacaine plus 0.5 ml (25 µg) fentanyl. Group N: Bupivacaine-Nalbuphin Patients received an intrathecal injection of 3 ml of 0.5% heavy (hyperbaric) bupivacaine plus 0.5 ml (0.5 mg) Nalbuphine. All patients were assessed and monitored for: Hemodynamics: ECG for heart rate, and non-invasive arterial pressure, respiratory rate and arterial oxygen saturation, onset of sensory block, onset of motor block, duration of analgesia &amp; 1st rescue analgesia, duration of motor block, adverse effects as: hypotension, bradycardia, respiratory depression, pruritus, shivering, nausea and vomiting were recorded. Results &amp; Conclusion Addition of a small dose of nalbuphine or fentanyl to bupivacaine in spinal anesthesia moderately prolonged the time of postoperative analgesia the duration of postoperative analgesia is nearly the same in nalbuphine group &amp; the fentanyl group. There is more rapid onset of motor block in fentanyl group than in nalbuphine group but with no difference in sensory or motor block regression. No respiratory depression or degree of sedation occurs in both groups. Hemodynamic stability &amp; side effects incidence are the same in both groups

Comparison between Intrathecal Nalbuphine and Bupivacaine versus Fentanyl and Bupivacaine For Postoperative Analgesia After Lower Abdominal Surgeries