Negative Effects of Noise on NICU Graduates' Cochlear Functions

Area of Science:

• Neonatal care
• Audiology
• Environmental health

Background:

• Neonatal intensive care units (NICUs) are environments with high noise levels.
• Exposure to excessive noise in infancy may pose risks to auditory development.

Purpose of the Study:

• To assess the impact of NICU noise exposure on infant hearing.
• To compare hearing outcomes in NICU graduates versus healthy controls.

Main Methods:

• Noise levels were continuously monitored in the NICU.
• Hearing was evaluated using Distortion Product Auto Acoustic Emission (DPOAE) tests.
• Thirty-two NICU infants and 25 healthy controls participated.

Main Results:

• NICU infants exhibited lower DPOAE Signal Noise Ratio (SNR) amplitudes across multiple frequencies compared to controls.
• Higher DPOAE fail rates were observed in NICU infants, particularly at lower frequencies (1001 Hz, 1501 Hz).
• Prolonged exposure to noise exceeding recommended levels correlated with failed hearing tests in NICU infants.

Conclusions:

• NICU graduates demonstrated adverse effects on hearing tests at six months of age.
• Noise exposure in the NICU is a significant factor affecting infant hearing development.
• Early identification and mitigation of noise in NICUs are crucial for protecting infant hearing.