Intrathecal neostigmine for post-cesarean section analgesia: dose response

Anesthesia and Analgesia
J A KrukowskiR L Parker

Abstract

Intrathecal (IT) neostigmine produces analgesia in animals and humans and enhances systemic opioid analgesia. To examine the safety of IT neostigmine for eventual use in obstetrics, we studied 24 healthy, term pregnant patients scheduled to receive elective cesarean section using a combined spinal-epidural anesthetic. Using an open-label, dose-ranging design, patients received either IT placebo or neostigmine 10, 30, or 100 microg in a 1-mL solution of 5% glucose in normal saline followed in 15 min by 2% epidural lidocaine for cesarean section. Neostigmine did not affect fetal heart rate tracings or Apgar scores. The women received patient-controlled analgesia intravenous morphine postoperatively. Compared with the glucose control, neostigmine produced a dose-independent reduction in postoperative morphine use. Cumulative average 24-h morphine use was 82 +/- 7 mg for women receiving IT placebo and 50 +/- 8 mg for women receiving IT neostigmine (P < 0.003). Hourly morphine use was significantly reduced in the neostigmine groups for 10 h postoperatively. These data indicate that IT neostigmine can produce 10 h of post-cesarean section analgesia without adverse fetal effects and support cautious further prospective study.

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