Altuncu E, Akman I, Kulekci S, Akdas F, Bilgen H, Ozek E
Department of Pediatrics, Division of Neonatology Unit, Marmara University School of Medicine, Turkey.
Int J Pediatr Otorhinolaryngol. 2009 Jul;73(7):951-3. doi: 10.1016/j.ijporl.2009.03.013. Epub 2009 Apr 29.
The purposes of this study were to measure the noise level of a busy neonatal intensive care unit (NICU) and to determine the effect of sound absorbing panel (SAP) on the level of noise inside the isolette.
The sound pressure levels (SPL) of background noise, baby crying, alarms and closing of isolette's door/portholes were measured by a 2235-Brüel&Kjaer Sound Level Meter. Readings were repeated after applying SAP (3D pyramidal shaped open cell polyurethane foam) to the three lateral walls and ceiling of the isolette.
The median SPL of background noise inside the NICU was 56dBA and it decreased to 47dBA inside the isolette. The median SPL of monitor alarms and baby crying inside the isolette were not different than SPL measured under radiant warmer (p>0.05). With SAP, the median SPL of temperature alarm inside the isolette decreased significantly from 82 to 72dBA, monitor alarm from 64 to 56dBA, porthole closing from 81 to 74dBA, and isolette door closing from 80 to 68dBA (p<0.01). There was a significant reduction in the noise produced by baby crying when SAP was used in the isolette (79dBA vs 69dBA, respectively) (p<0.0001). There was also significant attenuation effect of panel on the environmental noise.
The noise level in our NICU is significantly above the universally recommended levels. Being inside the isolette protects infants from noise sources produced outside the isolette. However, very high noises are produced inside the isolette as well. Sound absorbing panel can be a simple solution and it attenuated the noise levels inside the isolette.
本研究旨在测量繁忙的新生儿重症监护病房（NICU）的噪音水平，并确定吸音板（SAP）对保育箱内噪音水平的影响。
使用2235型布劳恩&克耶尔声级计测量背景噪音、婴儿哭声、警报声以及保育箱门/舷窗关闭时的声压级（SPL）。在保育箱的三个侧壁和天花板上应用吸音板（3D金字塔形开孔聚氨酯泡沫）后重复测量读数。
NICU内背景噪音的SPL中位数为56dBA，保育箱内降至47dBA。保育箱内监护仪警报声和婴儿哭声的SPL中位数与辐射保暖台下测量的SPL无差异（p>0.05）。使用吸音板后，保育箱内温度警报的SPL中位数从82dBA显著降至72dBA，监护仪警报从64dBA降至56dBA，舷窗关闭声从81dBA降至74dBA，保育箱门关闭声从80dBA降至68dBA（p<0.01）。在保育箱中使用吸音板时，婴儿哭声产生的噪音显著降低（分别为79dBA和69dBA）（p<0.0001）。吸音板对环境噪音也有显著的衰减作用。
我们NICU的噪音水平显著高于普遍推荐的水平。在保育箱内可保护婴儿免受保育箱外产生的噪音源影响。然而，保育箱内也会产生非常高的噪音。吸音板可能是一个简单的解决方案，它能降低保育箱内的噪音水平。
