Psychoacoustic analysis of noise and the application of earplugs in an ICU

Czaplik, Michael; Rossaint, Rolf; Kaliciak, Julia; Follmann, Andreas; Kirfel, Sabine; Scharrer, Roman; Guski, Martin; Vorländer, Michael; Marx, Gernot; Coburn, Mark

doi:10.1097/eja.0000000000000313

Cited by 17 publications

(7 citation statements)

References 25 publications

(28 reference statements)

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“…This suggests less C-weighted variability. Consistent with prior studies, mean A-weighted Leq over the full night period and in four-hour intervals during the night were elevated over the levels recommended by the WHO [24-29]. …”

Section: Discussionsupporting

confidence: 86%

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Comparing average levels and peak occurrence of overnight sound in the medical intensive care unit on A-weighted and C-weighted decibel scales

Knauert

Jeon

Murphy

et al. 2016

Journal of Critical Care

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Purpose Sound levels in the intensive care unit (ICU) are universally elevated and are believed to contribute to sleep and circadian disruption. The purpose of this study is to compare overnight ICU sound levels and peak occurrence on A- versus C-weighted scales. Materials and Methods This was a prospective observational study of overnight sound levels in 59 medical ICU patient rooms. Sound level was recorded every 10 seconds on A- and C-weighted decibel scales. Equivalent sound level (Leq) and sound peaks were reported for full and partial night periods. Results The overnight A-weighted Leq of 53.6 dBA was well above World Health Organization (WHO) recommendations; overnight C-weighted Leq was 63.1 dBC (no WHO recommendations). Peak sound occurrence ranged from 1.8 to 23.3 times per hour. Illness severity, mechanical ventilation and delirium were not associated with Leq or peak occurrence. Leq and peak measures for A- and C-weighted decibel scales were significantly different from each other. Conclusions Sound levels in the medical ICU are high throughout the night. Patient factors were not associated with Leq or peak occurrence. Significant discordance between A- and C-weighted values suggests that low frequency sound is a meaningful factor in the medical ICU environment.

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Section: Discussionsupporting

confidence: 86%

“…Average ICU sound levels are typically between 55 to 65 dBA [24-29] despite World Health Organization (WHO) recommendations for hospital sound averages and maxima of 30 and 40 dBA, respectively [30]. Maximum sound levels exceed 80 dBA in most studies of acute or critical care environments [24, 25, 31, 32].…”

Section: Introductionmentioning

confidence: 99%

Comparing average levels and peak occurrence of overnight sound in the medical intensive care unit on A-weighted and C-weighted decibel scales

Knauert

Jeon

Murphy

et al. 2016

Journal of Critical Care

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“…what the listener perceives is complimentary with how they expect a data value to sound when it is sonified). Psychoacoustic parameters such as fluctuation strength, roughness, sharpness and loudness [13] are a reliable method of understanding the subjective qualities of sound -so much so that they have been found to show a higher correlation with human perception than physiological measurements [9]. These parameters are responsible for a substantial part of the affect a sound has on a listener -combined, they can model the relative degree of noise annoyance [10], and roughness independently has been found to be a primary component in both natural and artificial alarm sounds [2].…”

Section: Doimentioning

confidence: 99%

Investigating Perceptual Congruence between Data and Display Dimensions in Sonification

Ferguson

Brewster

2018

Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems

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The relationships between sounds and their perceived meaning and connotations are complex, making auditory perception an important factor to consider when designing sonification systems. Listeners often have a mental model of how a data variable should sound during sonification and this model is not considered in most data:sound mappings. This can lead to mappings that are difficult to use and can cause confusion. To investigate this issue, we conducted a magnitude estimation experiment to map how roughness, noise and pitch relate to the perceived magnitude of stress, error and danger. These parameters were chosen due to previous findings which suggest perceptual congruency between these auditory sensations and conceptual variables. Results from this experiment show that polarity and scaling preference are dependent on the data:sound mapping. This work provides polarity and scaling values that may be directly utilised by sonification designers to improve auditory displays in areas such as accessible and mobile computing, process-monitoring and biofeedback.

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“…Furthermore, the intensive care unit (ICU) environment is filled with noise, which greatly exaggerates the stress and anxiety of conscious patients1. There is evidence that stress and anxiety have adverse effects on clinical outcomes, and prevention of exposure to environmental noise can help to improve outcome23.…”

mentioning

confidence: 99%

Sedation of mechanically ventilated adults in intensive care unit: a network meta-analysis

Zhang

Chen

et al. 2017

Sci Rep

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Sedatives are commonly used for mechanically ventilated patients in intensive care units (ICU). However, a variety of sedatives are available and their efficacy and safety have been compared in numerous trials with inconsistent results. To resolve uncertainties regarding usefulness of these sedatives, we performed a systematic review and network meta-analysis. Randomized controlled trials comparing sedatives in mechanically ventilated ICU patients were included. Graph-theoretical methods were employed for network meta-analysis. A total of 51 citations comprising 52 RCTs were included in our analysis. Dexmedetomidine showed shorter MV duration than lorazepam (mean difference (MD): 68.7; 95% CI: 18.2–119.3 hours), midazolam (MD: 10.2; 95% CI: 7.7–12.7 hours) and propofol (MD: 3.4; 95% CI: 0.9–5.9 hours). Compared with dexmedetomidine, midazolam was associated with significantly increased risk of delirium (OR: 2.47; 95% CI: 1.17–5.19). Our study shows that dexmedetomidine has potential benefits in reducing duration of MV and lowering the risk of delirium.

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Psychoacoustic analysis of noise and the application of earplugs in an ICU

Abstract: German Clinical Trials Register (DRKS00000534).

Cited by 17 publications

References 25 publications

Comparing average levels and peak occurrence of overnight sound in the medical intensive care unit on A-weighted and C-weighted decibel scales

Comparing average levels and peak occurrence of overnight sound in the medical intensive care unit on A-weighted and C-weighted decibel scales

Investigating Perceptual Congruence between Data and Display Dimensions in Sonification

Sedation of mechanically ventilated adults in intensive care unit: a network meta-analysis

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