To evaluate the feasibility of auditory monitoring of neurophysiological status using frequency-following response (FFR) in neonates with progressive moderate hyperbilirubinemia, measured by transcutaneous (TcB) levels.
ABR and FFR measures were compared and correlated with TcB levels across three groups. Group I was a healthy cohort (n = 13). Group II (n = 28) consisted of neonates with progressive, moderate hyperbilirubinemia and Group III consisted of the same neonates, post physician-ordered phototherapy.
FFR amplitudes in Group I controls (TcB = 83.1 ± 32.5µmol/L; 4.9 ± 1.9 mg/dL) were greater than Group II (TcB = 209.3 ± 48.0µmol/L; 12.1 ± 2.8 mg/dL). After TcB was lowered by phototherapy, FFR amplitudes in Group III were similar to controls. Lower TcB levels correlated with larger FFR amplitudes (r = −0.291, p = 0.015), but not with ABR wave amplitude or latencies.
The FFR is a promising measure of the dynamic neurophysiological status in neonates, and may be useful in tracking neurotoxicity in infants with hyperbilirubinemia.
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We thank Ms. Yaofang Hu and Drs. Anna Zhdamirova, Esther Pugh, and Hayley Shillington for their assistance in data collection.
This work was supported in part by the Department of Audiology at University of the Pacific and the Department of Pediatrics at the Nanjing Maternal and Child Health Hospital Associated to Nanjing Medical University.
Conflict of interest
The authors declare that they have no conflict of interest.
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Musacchia, G., Hu, J., Bhutani, V.K. et al. Frequency-following response among neonates with progressive moderate hyperbilirubinemia. J Perinatol (2019) doi:10.1038/s41372-019-0421-y
Journal of Perinatology (2020)
Hearing Research (2019)