Journal
AMERICAN JOURNAL OF PERINATOLOGY
Volume 23, Issue 5, Pages 265-271Publisher
THIEME MEDICAL PUBL INC
DOI: 10.1055/s-2006-941455
Keywords
noise; alarm; newborn intensive care unit
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This one-group pre-post test design was to evaluate sound distribution and sudden peak noise frequencies (SPNs) and the associated events after using a noise-sensor light alarm in a tertiary neonatal intensive care unit (NICU). The alarm is activated as the sound level reaches >= 65 A-weighted decibel (dBA). The environmental sound level was monitored continuously for a period of 1 week before and 1 month after using the alarm. The mean sound level in the incubator of patients receiving ventilator support before and after using the device were 58.0 +/- 0.6 and 56.4 +/- 0.7 dBA (t = 8.619; p < 0.001), whereas those at the radiant heated bed were 58.0 +/- 2.4 and 58.1 +/- 2.0 dBA (t = 0.715; P = 0.476). The percentage of observation time of sound levels < 58 dBA increased by 28% in the incubator and 4% at the radiant heated bed (p < 0.001). Episodes of SPN decreased from 630 to 185 times/d in the incubator and from 2069 to 748 times/d at the radiant heated bed after using the device. The noise-sensor light alarm effectively reduces sound level and episodes of SPN in the NICU. This may alleviate stress of noise for newborns with critical Illness.
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