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Year : 2020  |  Volume : 7  |  Issue : 2  |  Page : 176-181

Efficacy of adding magnesium sulfate to bupivacaine for ilioinguinal and iliohypogastric nerve block in acute postherniorrhaphy pain

Department of Anesthesia and Surgical Intensive Care, Faculty of Medicine, Mansoura University, Mansoura, Egypt

Correspondence Address:
MD Maha A Abo-Zeid
Department of Anesthesia and Surgical Intensive Care, Faculty of Medicine, Mansoura University, Mansoura, 35516
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/roaic.roaic_88_19

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Background Regional block of ilioinguinal and iliohypogastric (IIIH) nerves has been applied to provide postoperative analgesia after inguinal hernia repair. Magnesium sulfate (MgSo4) blocks N-methyl-d-aspartate receptors, and that is why, it was used as an adjuvant to the local anesthetic (LA) in different anesthetic approaches. Although the prolongation in postoperative duration resulting from the addition of MgSO4 to LA was significant in some literature studies, it was insignificant in others. Objective This study was designed to investigate the adjunctive effect of MgSo4 when added to bupivacaine for IIIH blockade on the postoperative analgesic duration as a primary outcome and on the verbal rating scale (VRS) scores, analgesic consumption, and hemodynamics as secondary outcomes. Patients and methods Patients were divided into two groups of 45 patients each by means of coded envelopes according to the LA used for IIIH blockade. In the first group (control group), patients received 10 ml 0.5% isobaric bupivacaine plus 1 ml normal saline for IIIH blockade, whereas in the second group (MgSo4 group), 10 ml 0.5% isobaric bupivacaine and 1 ml of MgSo4 10% were prepared. All the patients received intrathecal 3 ml 0.5% hyperbaric bupivacaine, and then, IIIH blockade was performed under ultrasound guidance according to the group. Postoperatively, VRS scores, analgesic duration, and any complication were recorded. Results There was a significantly prolonged analgesic duration in MgSo4 group when compared with the control group. However, the consumed analgesic in the first postoperative day and the pain score were insignificantly lower in MgSo4 group. Conclusion The addition of MgSO4 to bupivacaine for IIIH nerve block prolonged the postoperative analgesic duration after inguinal hernia repair without significant effect on the analgesic consumption or VRS scores.

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