Analgesic efficacy of two doses of intrathecal midazolam with bupivacaine in patients undergoing cesarean delivery.
OBJECTIVE
In this prospective, randomized, double-blind, placebo-controlled study, we investigated the postoperative analgesic efficacy of 2 doses of intrathecal midazolam as an adjunct to bupivacaine for spinal anesthesia.


METHODS
Sixty patients undergoing elective cesarean delivery under spinal anesthesia were allocated randomly to 3 groups: group B, 2 mL hyperbaric bupivicaine 0.5%; group BM1, 2 mL bupivacaine plus midazolam 1 mg (preservative free); and group BM2, 2 mL bupivicaine plus midazolam 2 mg.


RESULTS
The mean duration of postoperative analgesia (determined by request for rescue medication) was 3.8 +/- 0.5 hours in group B compared with 4.3 +/- 0.7 hours in group BM1 (P = .18), and 6.1 +/- 1.0 hours in group BM2 (P = .001). Supplemental analgesic requirements with diclofenac were significantly less in group BM2 (93 +/- 29 mg) compared with group B (145 +/- 12 mg) and group BM1 (148 +/- 16 mg, P < .001). Time to block regression was longer in group B (182 +/- 30 minutes) compared with group BM1 (152 +/- 32 minutes) and group B (126 +/- 20 minutes) (both P < .001). Arterial pressure, heart rate, oxygen saturation, sedation score, and time to first void were comparable between groups. Group B had a significantly higher incidence of nausea and vomiting than groups BM1 and BM2 (P = .02). No neurologic deficits were observed.


CONCLUSIONS
Intrathecal midazolam 2 mg provided a moderate prolongation of postoperative analgesia when used as an adjunct to bupivacaine in patients undergoing cesarean delivery. Intrathecal midazolam, 1 mg and 2 mg, decreased postoperative nausea and vomiting.
Prakash
Smita
S
Department of Anesthesia and Intensive Care, Vardhman Mahavir Medical College and Safdarjang Hospital, New Delhi, India. drsunilprakash@gmail.com
Joshi
Nandita
N
Gogia
Anoop R
AR
Prakash
Sunil
S
Singh
Rajvir
R
D000328:Adult; D016362:Analgesia, Obstetrical; D000700:Analgesics / Q000008:administration & dosage*; D000773:Anesthesia, Obstetrical; D000775:Anesthesia, Spinal; D000779:Anesthetics, Local / Q000008:administration & dosage*; D002045:Bupivacaine / Q000008:administration & dosage*; D002585:Cesarean Section; D004305:Dose-Response Relationship, Drug; D004311:Double-Blind Method; D004334:Drug Administration Schedule; D004359:Drug Therapy, Combination; D005260:Female; D006801:Humans; D007278:Injections, Spinal; D008874:Midazolam / Q000008:administration & dosage*; D010147:Pain Measurement; D010149:Postoperative Pain / Q000517:prevention & control*; D011247:Pregnancy; D011446:Prospective Studies; D013997:Time Factors
D000700:Analgesics; D000779:Anesthetics, Local; D008874:Midazolam; D002045:Bupivacaine