Click Evoked Otoacoustic Emissions in Occupational Exposure to Lead, Concentrations of Selected Essential Elements and Markers of Oxidative Stress

Overview

Journal Eur Arch Otorhinolaryngol

Specialty Otorhinolaryngology

Date 2024 May 1

PMID 38693445

Authors

Marta Wasik

Grazyna Lisowska

Michal Slota

Katarzyna Miskiewicz-Orczyk

Aleksandra Kasperczyk

Francesco Bellanti

Michal Dobrakowski

Rafal Jakub Buldak

Slawomir Kasperczyk

Affiliations

Soon will be listed here.

Abstract

Purpose: This study focused on the selected markers of oxidative stress, impact of elevated lead levels on long-term hearing quality. We investigated whether the presence of certain essential minerals might provide protection to the auditory system against the effects of lead (and cadmium) compounds.

Methods: The research group included 280 male employees of the zinc and lead smelter, which was divided into: L-Pb-low blood lead concentration (PbB) subgroup, H-Pb-high PbB subgroup. Hearing tests were performed using the click evoked otoacoustic emission (CEOAE).

Results: Zinc protoporphyrin level was significantly higher in the H-Pb subgroup by 68%. Cd concentration was significantly higher in H-Pb by 33%. The Ca concentration was significantly lower in the H-Pb by - 2%. Selected oxidative stress markers concentration were significantly higher in the H-Pb group: malondialdehyde (MDA) by 4%, and lipofuscin (LPS) by 9%. In the CEOAE results showed statistically significant differences between the L-Pb and H-Pb subgroups. Larger negative changes in otoemission amplitude were observed in H-Pb subgroup. All otoemission results showed a statistically significant negative correlation with age, time of work, MDA concentration, and with PbB. Selected CEOAE parameters showed a significant negative correlation with cadmium blood concentration (CdB), and a positive correlation with Ca and Zn.

Conclusion: Elevated blood lead content in occupational exposure is associated with an increase in MDA and LPS concentration, which negatively correlates with CEOAE parameters. This suggests an important role of oxidative stress in the long-term deterioration of hearing.

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