Background: Though one of the most important investigations in paediatric audiology, brainstem evoked response audiometry (BERA) often necessitates sedation or general anaesthetics, especially in newborn and infants. In paediatric neurology, melatonin has been successfully used for some years to induce sleep prior to EEG investigations. Melatonin as a hormone regulating the circadian rhythm induces natural sleep without the risks of sedation. Side effects are not known.
Methods: Click-induced BERA was first performed in 10 adults with normal hearing with and without previous melatonin administration, and click thresholds and latencies of evoked potentials were compared. 50 children then underwent BERA in melatonin-induced sleep.
Results: Click thresholds in adults were mostly identical (r = 0,88), while the mean latencies of evoked potentials seemed to be minimally prolonged (r from 0,82 to 0,95). Click-induced BERA was successful in 45 of the 50 children, and notched-noise BERA in at least 2 frequencies in 38 of 43 children.
Conclusions: Offering a high success rate with no side effects, melatonin-induced sleep seems to be a good alternative to sedation. This method is widely accepted by parents and permits earlier diagnosis of hearing impairment in the routine clinical setting.
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