Blocking noise but not music lowers bispectral index scores during sedation in noisy operating rooms.
OBJECTIVE
To determine whether playing music or blocking noise can reduce bispectral index (BIS) values during propofol sedation.


METHODS
Prospective, randomized, single-blinded study.


METHODS
Operating room.


METHODS
63 ASA physical status I and II patients, aged 55 to 75 years, undergoing total knee replacement.


METHODS
Patients were divided into three groups: noise, silence, and music. After induction of combined spinal-epidural anesthesia, sedation was begun with 1.2 mug/mL of propofol in a target-controlled infusion. In the silence group, patients' ears were packed tightly to block ambient noise, whereas patient-selected music was applied to patients in the music group. Patients in the noise group were exposed to ambient operating room noise.


METHODS
Bispectral index measurement was recorded 7 times during operation. Ambient room noise was recorded at the same time sequence.


RESULTS
Sound level was highest when the saw (T3, 80.25 dB) and the impact device (T4, 80.98 dB) were in use. Bispectral index scores in the silence group during those times (T3, 68.5 vs 76.9, P = 0.025, and T4, 67.6 vs 78, P = 0.005) were lower than in the noise group. However, BIS scores were similar in the noise and music groups. Preoperative anxiety level, postoperative comfort level, and pain scores were similar in all groups.


CONCLUSIONS
Blocking noise is more effective than playing music in reducing BIS scores during propofol sedation in a noisy environment.
Kang
Jin Gu
JG
Department of Anesthesiology and Pain Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, South Korea.
Lee
Jeong Jin
JJ
Kim
Da Mi
DM
Kim
Jie Ae
JA
Kim
Chung Su
CS
Hahm
Tae Soo
TS
Lee
Byung Dal
BD
D000368:Aged; D016292:Procedural Sedation; D004569:Electroencephalography; D005260:Female; D006801:Humans; D006993:Hypnotics and Sedatives; D008297:Male; D008875:Middle Aged; D009146:Music / Q000523:psychology; D009622:Noise / Q000009:adverse effects*; D009873:Operating Rooms; D017063:Outcome Assessment, Health Care; D015742:Propofol; D011446:Prospective Studies; D012107:Research Design; D016037:Single-Blind Method
D006993:Hypnotics and Sedatives; D015742:Propofol