Brainstem auditory evoked potentials in experimentally-induced bovine spongiform encephalopathy

Area of Science:

• Veterinary Neurology
• Neurophysiology
• Prion Diseases

Background:

• Bovine spongiform encephalopathy (BSE) is a fatal neurodegenerative disease in cattle.
• Early detection of neurological dysfunction is crucial for understanding BSE progression.
• Brainstem auditory evoked potentials (BAEP) assess the integrity of the auditory pathway.

Purpose of the Study:

• To evaluate neurological dysfunction in experimentally-induced bovine spongiform encephalopathy (BSE) cattle.
• To characterize changes in brainstem auditory evoked potentials (BAEP) associated with BSE.
• To correlate BAEP findings with clinical neurological symptoms in BSE.

Main Methods:

• Experimentally-induced bovine spongiform encephalopathy (BSE) in cattle.
• Assessment of neurological dysfunction using brainstem auditory evoked potentials (BAEP).
• Bilateral recording of BAEP wave latencies and amplitudes.

Main Results:

• Progressive prolongation of BAEP peak latencies (waves III and V) bilaterally.
• Significant prolongation of wave V latency and I-V interpeak latency (IPL) at 22-24 months post-inoculation (P<0.05).
• Reduced BAEP wave amplitudes in BSE cattle compared to controls; hearing loss correlated with advanced symptoms like tremor.

Conclusions:

• BAEP data reflects functional disorders in central auditory nerve pathways in experimentally-induced BSE.
• BAEP can identify auditory pathway abnormalities characteristic of BSE.
• These findings support the utility of BAEP in diagnosing and monitoring neurological changes in BSE.