Elevated Sound Levels in the Neonatal Intensive Care Unit: What Is Causing the Problem?

Area of Science:

• Neonatal Intensive Care Unit (NICU) environment
• Pediatric critical care acoustics
• Infant neurodevelopmental research

Background:

• Neonatal intensive care units (NICUs) present a persistently noisy environment for premature and sick neonates, with sound levels frequently reaching 120 decibels.
• This noise level far surpasses the American Academy of Pediatrics' recommended maximum of 45 decibels, potentially impacting infant well-being.

Purpose of the Study:

• To quantitatively measure ambient sound levels within a level III NICU.
• To identify and describe environmental factors contributing to elevated noise levels in the NICU.

Main Methods:

• A descriptive quantitative study design was employed.
• Sound levels were systematically measured using a portable sound meter in an open-bay level III NICU setting.
• Contributing environmental factors were meticulously recorded and analyzed to determine their correlation with noise levels.

Main Results:

• Mean sound levels across day, evening, and night shifts were recorded at 83.5, 83, and 80.9 decibels, respectively.
• Noise levels exceeded recommended guidelines approximately 90% of the time, nearly doubling the American Academy of Pediatrics' benchmark.
• Multiple linear regression analysis identified the number of neonates, personnel, alarms, infant acuity, and shift type as significant contributors to elevated sound levels, explaining 14.5% of the variance.

Conclusions:

• Establishing baseline sound levels and identifying contributing factors are essential initial steps for implementing noise-reduction strategies in NICUs.
• Further research is imperative to develop effective and sustainable methods for reducing NICU noise, including within incubators, to foster optimal infant growth and neurodevelopment.