Use of active noise cancellation devices in caregivers in the intensive care unit.
OBJECTIVE
Recent development of noise cancellation devices may offer relief from noise in the intensive care unit environment. This study was conducted to evaluate the effect of noise cancellation devices on subjective hearing assessment by caregivers in the intensive care units.


METHODS
Randomized, double-blind.


METHODS
Adult medical intensive care unit and pediatric intensive care unit of a teaching hospital.


METHODS
Caregivers of patients, including nurses, parents, respiratory therapists, and nursing assistants from a medical intensive care unit and pediatric intensive care, were enrolled in the study.


METHODS
Each participant was asked to wear the headphones, functional or nonfunctional noise cancellation devices, for a minimum of 30 mins.


METHODS
Subjective ambient noise level was assessed on a 10-point visual analog scale (VAS) before and during headphone use by each participant. Headphone comfort and the preference of the caregiver to wear the headphone were also evaluated on a 10-point VAS. Simultaneously, objective measurement of noise was done with a sound level meter using the decibel-A scale and at each of nine octave bands at each bedspace.


RESULTS
The functional headphones significantly reduced the subjective assessment of noise by 2 (out of 10) VAS points (p < 0.05) in environments of equal objective noise profiles, based on decibel-A and octave band assessments.


CONCLUSIONS
Noise cancellation devices improve subjective assessment of noise in caretakers. The benefit of these devices on hearing loss needs further evaluation in caregivers and critically ill patients.
Akhtar
S
S
Department of Anesthesiology, Yale University School of Medicine, USA.
Weigle
C G
CG
Cheng
E Y
EY
Toohill
R
R
Berens
R J
RJ
D000328:Adult; D017028:Caregivers; D002648:Child; D003422:Critical Care; D018592:Cross-Over Studies; D004311:Double-Blind Method; D004430:Ear Protective Devices / Q000706:statistics & numerical data; D004867:Equipment Design; D006801:Humans; D009622:Noise / Q000517:prevention & control*