Noise Impact in the Post-anesthesia Care Unit

World health organization recommends noise level should be less than 30db in hospital. However many analysis conclude to an average of 67dB in the post anesthesia care unit. No many studies were reported about noise impact in a post-anesthesia care unit. Only one was published by B.Allaouchiche in 2002. However, noise is a complaint reported by patients and it could be responsible for physiological and psychological troubles. In this prospective study, the main objective is to determine patients\' satisfaction in the post anesthesia care unit, before and after installation of a noise warning device. Between the two parts, a short training about noise consequences on health will be presented to nurses. Improvement off anti-noise actions on patient\'s satisfaction will analysed.