Noise-canceling headphones reduce post-surgery nausea and vomiting

Wearing noise-canceling headphones during general anesthesia may significantly reduce the incidence of post-operative nausea and vomiting (PONV), according to research presented at an anesthesiology conference in San Diego. The study was conducted by researchers from the First Affiliated Hospital of Suzhou University in China.

The trial involved 192 patients undergoing laparoscopic gynecological surgery under general anesthesia. Half of the participants wore sound-attenuating earcups from the start of anesthesia until the end of the procedure, while all patients received standard anesthetic protocols and antiemetic medication.

Within 48 hours post-surgery, 35% of patients who wore earcups reported nausea or vomiting, compared to 52% in the group that did not. The study also noted that patients whose hearing was protected experienced less severe symptoms, including fewer vomiting episodes and less impact on daily activities.

Operative rooms typically generate noise levels averaging 66 decibels, comparable to normal conversation. Researchers hypothesize that noise may induce stress responses and activate the autonomic nervous system, which is linked to the neural pathways controlling nausea and vomiting. While the exact mechanism remains unclear, the findings suggest that blocking auditory input might mitigate these effects.

Lead researcher Liu Huayue stated that while anesthesia causes loss of consciousness, it may not completely block the brain's processing of sound. Further research, including multi-center trials, is planned to explore the correlation between noise exposure, nervous system activity, and PONV in anesthetized patients.