In the study, the researchers registered sound levels around 13 seriously ill patients cared for in the intensive care unit at Södra Älvsborg Hospital over a 24-hour period. The study shows that the sound levels around seriously ill patients were on average between 51 and 55 dB. This is comparable with a busy road.
For the greater part of the 24 hours, between 70 and 90 per cent of the time, the sound level was above 55 dB – in addition, there were a number of short sound bursts above 100 dB.
When the patients were interviewed about their experiences of the surrounding sounds, they recalled both positive and negative experiences. Positive experiences included, for example, the sound of the staff talking quietly between themselves or providing information on ongoing treatment.
“Sounds perceived as frightening were uncontrollable sounds from, for example, alarms, and sounds from seriously ill fellow patients, and treatments and examinations. Several patients also described how the sounds around them had entered into their dreams and hallucinations,” said Lotta Johansson, researcher at the Sahlgrenska Academy who led the study.
The sound levels found by the study are slightly lower than those measured by previous studies but still significantly higher than the 30 dB recommended by the WHO for patient rooms in hospitals.
“The interesting thing is that what the patients considered most disturbing was unknown and uncontrollable sounds rather than the generally high sound level. This shows that we must take further measures to create healing care environments with better conditions for sleep and recovery for seriously ill patients,” explained Lotta Johansson.
The study “The sound environment in an ICU patient room – A content analysis of sound levels and patient experiences” was published in the journal Intensive and Critical Care Nursing. It is a preliminary study for a larger project in which the researchers will study in more depth and from a longer perspective how the physical environment affects seriously ill patients.