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brief-report

Hemispheric Synchronized Sounds and Perioperative Analgesic Requirements

Susan Dabu-Bondoc, MD^*, Nalini Vadivelu, MD^*, Judy Benson, RN^*,,,, Danielle Perret, MD, and Zeev N. Kain, MD, MBA^,,

From the *Department of Anesthesiology, Yale University School of Medicine; and Departments of Anesthesiology, Pediatrics, and Psychiatry and Human Behavior, University of California, Irvine, California.

Address correspondence and reprint requests to Zeev N. Kain, MD, MBA, Departments of Anesthesiology, Pediatrics, and Psychiatry, University of California, Irvine, CA. Address e-mail to zkain{at}uci.edu.

Abstract

Background: Data on the effect of Hemisync® sounds on perioperative analgesic requirements are scant.

Methods: We randomized surgical outpatients into a treatment group that received Hemisync sounds (n = 20), a music group that received music (n = 20), and a control group that had a blank cassette tape (n = 20). All subjects underwent a controlled standardized propofol-nitrous-vecuronium and fentanyl general anesthesia.

Results: The treatment group had significantly reduced intraoperative fentanyl consumption (P < 0.05). Postoperatively, pain visual analog scale scores were significantly lower in the Hemisync group at 1 h (P = 0.02) and 24 h (P = 0.005). Subjects in the Hemisync group were also discharged earlier (P = 0.048).

Conclusion: The use of Hemisync sounds before and during general anesthesia reduces intraoperative analgesic requirements, postoperative pain scores, and discharge time.