Auditory brain-stem evoked potentials in patients with thyroid and parathyroid dysfunction: adaptation to chronic...

Area of Science:

• Neuroscience
• Endocrinology
• Audiology

Background:

• Parathyroid and thyroid hormones significantly influence various bodily functions.
• Previous research suggested acute hormonal imbalances could affect auditory brainstem function.
• The long-term effects of chronic hormonal dysfunction on auditory pathways remained unclear.

Purpose of the Study:

• To investigate the impact of chronic parathyroid and thyroid dysfunction on auditory brainstem evoked potentials (ABEPs).
• To determine if serum calcium and thyroid hormone levels correlate with electrophysiological auditory measures.
• To explore potential adaptive mechanisms in the auditory system under chronic hormonal imbalances.

Main Methods:

• Auditory Brainstem Evoked Potentials (ABEPs) and pure tone audiograms were recorded.
• ABEPs were analyzed using I-V interpeak latency at varying click rates (10/sec and 55/sec).
• Participants included patients with hypercalcemia, hypocalcemia, hyperthyroidism, hypothyroidism, and healthy controls.

Main Results:

• No significant effect of serum calcium or thyroid hormone levels on ABEP measures was observed.
• No significant correlation was found between biochemical markers and electrophysiological auditory measures.
• ABEP measures remained stable despite chronic hormonal dysregulation.

Conclusions:

• Chronic calcium and thyroid hormonal imbalances do not appear to impair auditory brainstem function.
• Adaptive mechanisms likely compensate for long-term hormonal homeostatic changes.
• Findings contrast with previous reports on acute hormonal effects, highlighting the resilience of the auditory system.