Noise pollution in neonatal units: a potential health hazard.

Hospital noise levels were measured for four consecutive days every two hours throughout the day in a neonatal intensive care unit (NICU), a normal nursery room and inside infant incubators when the latter were associated with different types of life-support equipment. There was a difference in the noise level between normal nursery and NICU, whereas a considerable increase of noise was recorded when the infant received supplemental oxygen, was under ventilator or when an air compressor was in operation. High noise levels were equally the same both in a.m. and p.m. hours in the NICU. As many high risk infants spend a long time in a NICU, there is an urgent need for further evaluation of noise levels and their effect on the outcome of infants.