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PHOENIX,. ARIZ. -- Ondansetron has a dose-related prophylactic effect in relieving pruritus associated with spinal opioids administered for labor analgesia, Dr. Scott Segal said.
Patients who received 8 mg of ondansetron intravenously along with the standard intrathecal analgesic medication reported significantly milder itching than patients who received 2 or 4 mg ondansetron or a saline placebo, Dr. Segal reported at the annual meeting of the Society for Obstetric Anesthesia and Perinatology.
In a randomized double-blinded trial, Dr. Segal and his colleagues at Brigham and Women's Hospital in Boston assigned 40 women planning neuraxial analgesia for labor into four groups. Each patient received spinal analgesia consisting of 25 mg fentanyl plus 2.5 mg bupivacaine. At the same time, they were given intravenous injections of 2, 4, or 8 mg ondansetron or the placebo.
Pruritus and pain were assessed using a 100-mm visual analog scale at the time of the spinal injection and 5,15, 30, 60, and 90 minutes thereafter, Dr. Segal said. Patients were allowed to have 5 mg IV nalbuphine as a rescue ...