The disquieting association between higher-than-recommended levels of nighttime hospital noises and clinically significant sleep loss reported Jan. 9 in the Archives of Internal Medicine would be an assault to the ears of Dr. Julia Barnett Rice, the founder of the Society for the Suppression of Unnecessary Noise.
Dubbed the “anti-noise queen” for her turn-of-the-century crusade against “preventable” noises such as the night-time whistles of tugboats traversing the Hudson near her New York City home, Dr. Rice (1859-1929) also campaigned tirelessly for the promotion of quiet zones near hospitals, decrying the too-loud and too-frequent environmental noises as murderers of sleep and menaces to health.
Fast-forward 100 years, and it appears that researchers at the University of Chicago have proven her point.
They found that patient room noise levels were significantly higher than the World Health Organization’s (WHO) recommendations for average noise levels. Further, peak noise level “approached that of a chain saw,” according to their research letter. Nighttime sound levels were lower than daytime levels, but all still significantly exceeded recommendations for maximum noise level and 94% exceeded recommendations for average noise level.
More than 40% of the patients reported noise disruptions of sleep, which were associated with higher maximum noise levels.
Sleep actigraphy data demonstrated that ”patients slept significantly less in the hospital than their self reported baseline sleep,” the authors observed, and mean sleep efficiency when hospitalized was low, with more than half of the recorded nights measuring below the normal lower boundary of 80% efficiency for adults.
While roommates, alarms, intercoms, and pagers were all associated with substantial percentages of noise disruption, the most disruptive source of environmental noise, it appears, was chatty staffers, as the percentage of noise disruption attributed to staff conversation was 65%.
Dr. Arora noted that “some amount of sleep loss in the hospital may be expected given the unfamiliar environment.” In fact, she said in an interview, “our next studies are actually looking at this and the component that may be driven by loss of control or stress.” In the current study, however, “patients lost more sleep in the hospital when noise levels were loudest after accounting for baseline sleep characteristics, so at least noise seems like an independent predictor of hospital sleep, highlighting the importance of optimizing the hospital environment.” The magnitude of the difference, she explained, is one hour less sleep, “which is pretty significant,” Further, patients in noisier rooms reported more complaints of noise, indicating that noise is an issue, she said.
Based on their findings, the authors concluded that “hospitals should implement interventions to reduce nighttime noise levels in an effort to improve patient sleep.” One possibility, Dr. Arora suggested, is a device called a Yacker Tracker, which measures noise and provides feedback to the staff about when the noise level exceeds a certain threshold.
And now that patient report of noise is now a reported measure on Medicare’s Hospital Compare, it will be in the best interest of hospitals as well as patients to implement noise-reduction measures, Dr. Arora noted. “Noisy hospitals will want to optimize patient noise to provide the best experience possible,” she stressed.
The Society for the Suppression of Unnecessary Noise, and its founder, would be well pleased.