RESUMOOs objeti vos deste estudo foram verifi car o nível de pressão sonora (NPS) de duas salas de Unidade de Terapia Intensiva Neonatal (UTIN) e identi fi car as suas fontes. É uma pesquisa quanti tati va, descriti va, conduzida em duas salas de UTIN de hospital universitário de São Paulo -SP, Brasil. Registros de NPS foram realizados por três dosímetros, totalizando 261 horas de mensuração. Obteve-se 48 horas de registros das fontes que produzem ruídos. Os resultados indicam elevados níveis de pressão sonora nos dois ambientes. Os maiores níveis de Leq foram 71,0 dBA na sala A e 68,0 dBA na sala B. As principais fontes de ruído encontradas nas duas unidades foram ruído no corredor, trânsito e conversa entre os profi ssionais. Os resultados revelam que os NPS das salas da UTIN estão distantes dos recomendados pelos órgãos regulamentadores. Foi desenvolvido um protocolo e implementado um programa educati vo, visando à redução dos níveis de pressão sonora. DESCRITORES Ruído Unidades de Terapia Intensiva Neonatal Enfermagem neonatal Humanização da assistênciaSound pressure levels in the Neonatal Intensive Care Unit ORIGINAL ARTICLE ABSTRACTThe objecti ves of the study were to assess sound pressure level (SPL) in two rooms of a Neonatal Intensive Care Unit (NICU) and to identi fy their sources. This quanti tati ve--descripti ve study was conducted in two rooms of a NICU of a University Hospital in São Paulo, Brazil. Three dosimeters were used to register SPL (total of 261 hours). A 48-hour register of noise sources was obtained. The results showed high SPL in both rooms. The greatest mean Leq were 71.0 dBA (room A) and 68.0 dBA (room B). Main noise sources in both units were: NICU hallway noise, traffi c and conversati on among professionals. The results indicate that SPLs in NICU rooms are higher than the levels recommended by regulatory agencies. A guideline was developed and an educati onal program was implemented as a means to reduce sound pressure levels.
The Brazilian Silence Program, created in 1990 by the Brazilian Ministry of Environment, advocates the production and use of equipment with lower noise level. The subcommittee of Noise Labeling of the Brazilian Committee of Certification is composed of INMETRO acoustic specialists to organize and implement the Brazilian Labeling Program. This subcommittee elaborated the label form and test procedure. The noise-labeling program will first concentrate on the following household devices, both manufactured in Brazil or imported from abroad; mixers, blenders, hairdryers, refrigerators, and vacuum cleaners. The label should contain the sound-power level in dBA. INMETRO or other credited laboratories are responsible for the measurements. The ISO 4871, 3740 (1 to 5), ISO 8960, and IEC 704 (1 to 4) and also the equivalent Brazilian standards are used for the measurements, such as ABNT NBR 13910-1. The main objective of the label is to inform the consumer about the emitted noise level. The label offers the noise parameter to be used by the consumer when comparing devices, considering price, performance, and now also noise. No restriction for noise level was established.
The question of the arrangement of sound absorbers has been under study for some time. In our approach we conducted a sequence of experiments in a reverberation chamber to determine the optimal sound absorption for different configurations of suspended absorbers using various air spaces and a central dividing panel between them. The results obtained were compared with measurements of the panels, tested against a solid backing as specified in ISO-R-354. It is shown that a porous absorber is more efficient at high frequencies if it is suspended in the sound field rather than against a solid backing. It was also found that the efficiency of an air space between the two porous sheets that compose a suspended absorber is moderately increased when a central divider is used. The statistical precision of the test was also investigated.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.