Clinical procedure
ABR was routinely conducted for patients to assess their auditory threshold and neurological diagnosis in our hospital. After a consultation with an otolaryngology department specialist, the Chloral Hydrate was administered by a trained nurse or audiologist under the supervision of the Otolaryngologists, by the oral route without exceptional circumstances.
Chloral Hydrate was administered at a concentration of 10%, at a dose of 30 mg/kg. In consideration of safety, the drug was not further supplemented. Chloral Hydrate can be mixed with dairy products or other liquids to mask its bitter taste to help children complete ingestion. Furthermore, if not sedated after 45–60 minutes, the appointment would be rescheduled. Patients were required to perform sleep deprivation and fast for at least three hours before the ABR test, as these were believed to help them fall asleep.