Noise levels were recorded again after the interventions, and the peak at shift change was reduced to 86 decibels, a reduction of more than 80 percent. (A 10-decibel reduction is equal to a 50 percent drop in sound intensity.) The average overnight noise level was reduced from 45 decibels originally to 42 decibels after the changes. Nearly two-thirds of the patients commenting in a satisfaction survey about noise and sleep issues gave positive feedback on the closed doors, general unit quietness and the willingness of staff to ensure a quiet night of sleep.
Cmiel hopes the results from her group's study will encourage nursing teams elsewhere to investigate barriers to sleep in their units, and take action. "The first step is to survey patients and ask what noises are interfering with their sleep," Cmiel says. "Problems in a given environment may be different from our experience, and noises patients find disturbing are not always apparent to nursing staff. But it's worth the effort; reductions of even a few decibels can improve sleep and help patients get the rest they need to heal."
Co-authors of the paper include Dana Karr, Dawn Gasser, Loretta Oliphant and Amy Neveau. The original leader of the sleep promotion team was Jean Henderson, now at Innovis Health in Fargo, N.D.
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Contact: Lee Aase
newsbureau@mayo.edu
507-284-5005
Mayo Clinic
4-Feb-2004