The Effect of Noise and Light on Sedation in Critical Care Patients. A Cross-Sectional Study of Critical Care Nurses in Three Intensive Care Units in Norway

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Background: International guidelines for pain, sedation, delirium, immobility, and sleep in critically ill patients recommend the use of noise and light reduction strategies to improve sleep. The aims of this study were: 1) to evaluate critical care nurses’ (CCNs) perceptions regarding sources of noise and light in the intensive care unit (ICU), and 2) to identify factors associated with critical care patients’ need for sedation when their sleep is disturbed by noise or light. Methods: A cross-sectional study was conducted in three Norwegian ICUs (n = 193). Results: A total of 87% of the CCNs stated that critical care patients were exposed to noise, and the most frequent sources were alarms from monitoring equipment (71%) and mechanical ventilators (70%), and nurses talking (65%). The results demonstrated higher odds for critical care patients needing sedation when sleep was disturbed by noise, if the CCNs reported that noise disturbed patients sleep (OR 3.05), and lower odds if the CCN was from ICU C (OR 0.39). Most CCNs (82%) answered that there was a difference in the level of light during day versus night, and that the most frequent source of light at night was from small lamps (46%). It was higher odds that the CCNs perceived that critical care patients needed sedation when sleep was disturbed by light if the light disturbed the patient’s sleep in the unit (OR 4.78). There were lower odds if the CCNs was from ICU A (OR 0.32) or ICU C (OR 0.34). Conclusion: The findings from this study indicate that CCNs use sedatives to induce sleep for critical care patients to compensate for environmental factors such as noise and light. Variations between ICUs indicate different sedation practices between Norwegian ICUs.

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