A Study of Noise Levels in an Open-Bay ICU

Abstract

Background: Elevated noise levels are among the top complaints of patients and visitors in US hospitals. Several organizations, including the World Health Organization, have established limits of noise in hospitals. Unfortunately, most hospitals fail to meet these guidelines. The goal of this study was to study noise levels in the surgical intensive care unit at Eisenhower Army Medical Center to determine compliance with standards concerning noise levels and to assess whether the open-bay layout impacted noise levels. Methods: An observational study was performed examining sound pressure levels (Leq) during 3 different times of day. Measurements were taken in occupied and unoccupied patient rooms and with/without patients in adjacent rooms. Measurements were taken in both isolation rooms and open bays. Results: The average Leq was 69.9 dB, higher than the World Health Organization’s standards of 40 dB. The peak decibel readings averaged 82.0 dB. The open-bay rooms were significantly quieter than the isolation rooms. Average noise levels were consistent throughout the day. Conclusions: The ICU exhibited excess noise during all time periods. The open-bay layout resulted in lower noise levels, but overall levels were higher than set limits. Noise reduction strategies must be a part of construction strategy for intensive care units.