Noise Impact in the Post-anesthesia Care Unit (Post op NOISE)

Although the post- anesthesia care unit can be noisy, the effect of noise on patients recovering from anesthesia is unknown. Indeed, many studies are achieved in reanimation or ICU. That's why this prospective study is about patients' satisfaction after their stay in the post-anesthesia care unit. In a first part, noise is just measured with a sound level meter and patients are asked about their experience. Before the second part, during few days, nurses will be informed about noise consequences on heath. With some precaution, a decrease of the sound level in a room (ex: decrease scope alarms, speaking quietly, not slamming the drawer, noise warning device…) will be expected. The main objective is to determine the patient's satisfaction in the post-anesthesia care unit before and after installation of a noise warning device.