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Anesth Essays Res. 2019 Jul-Sep;13(3):522-527. doi: 10.4103/aer.AER_95_19.

Efficacy of Adding Midazolam to Bupivacaine for Transversus Abdominis Plane Block on Postoperative Analgesia after Hysterectomy: A Randomized Controlled Study.

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Department of Anesthesia, Surgical Intensive Care and Pain Management, Faculty of Medicine, Mansoura University, Mansoura, Egypt.
Department of Obstetrics and Gynaecology, College of Medicine, Mansoura University, Mansoura, Egypt.


Background and Aim:

Different adjuncts have been utilized to promote the quality and prolong the duration of local anesthetics for a variety of regional block techniques. This study aimed to assess the effects of midazolam coadministered with bupivacaine in transversus abdominis plane (TAP) block on the 24-h morphine consumption, the postoperative analgesia duration and adverse effects.

Settings and Design:

A prospective, randomized, controlled double-blind trial that was carried out at a university hospital.

Patients and Methods:

Eighty-two females subjected to open total abdominal hysterectomy under general anesthesia were involved in this trial. Participants were allocated randomly to either of two groups (41 each). Control group: received TAP block with 20 mL of 0.25% bupivacaine or midazolam group: received TAP block using the same volume of bupivacaine plus 50 μg/kg midazolam/side. Postoperative cumulative 24-h morphine consumption, analgesia duration, pain score, sedation score, and adverse events were recorded.

Statistical Analysis:

Student's t-test, Mann-Whitney U-test, and Chi-square test were used.


Patients in the midazolam group had a lower cumulative 24-h morphine consumption [median doses (interquartile range): 15 (10-19.50) mg compared to 25 (17.50-37) mg, P < 0.001], lower postoperative pain score at rest at the 4th, 6th, and 12th h (P = 0.01, 0.02, and 0.02, respectively) and on movement at 2, 4, 6, and 12 h (P < 0.001), longer time till the first postoperative demand for rescue analgesia (430.11 ± 63.02 min) compared to 327.78 ± 61.99 min (P < 0.001), and less sedation, nausea and/or vomiting, and pruritus.


Adding midazolam as a bupivacaine adjuvant for TAP block reduces the 24-h morphine consumption, extends the postoperative analgesia duration, and decreases the incidence of adverse effects following abdominal hysterectomy.


Bupivacaine; midazolam; open abdominal hysterectomy; postoperative analgesia; transversus abdominis plane block

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