Brainstem auditory evoked potential wave V latency-intensity function in normal Dalmatian and Beagle puppies

Area of Science:

• Veterinary Neurology
• Auditory Neuroscience
• Comparative Physiology

Background:

• Brainstem Auditory Evoked Potential (BAEP) testing is crucial for assessing auditory function in animals.
• Understanding breed-specific auditory characteristics aids in diagnosing hearing impairments in puppies.
• Previous research has not extensively detailed BAEP differences between Dalmatian and Beagle puppies.

Purpose of the Study:

• To compare click-evoked brainstem auditory potential (BAEP) characteristics in Dalmatian puppies versus age-matched Beagle puppies.
• To investigate potential interbreed differences in cochlear function and neural pathway maturation in young dogs.
• To determine if normal-hearing Dalmatian puppies exhibit similar BAEPs to other breeds.

Main Methods:

• Recorded short-latency BAEPs using condensation and rarefaction clicks in 23 Dalmatian and 16 Beagle puppies (1.5-2 months old).
• Stimulus intensity ranged from 90 dB normal hearing level down to the wave V threshold.
• Analyzed wave V latency-intensity curves, hearing thresholds, and wave V-I latencies between breeds.

Main Results:

• The slope of the wave V latency-intensity curve was significantly steeper in Dalmatians (-40 µs/dB) than Beagles (-28 µs/dB).
• Beagle puppies exhibited a lower hearing threshold compared to Dalmatians.
• Differences in wave V and wave V-I latencies at high stimulus intensity were observed between the two breeds.

Conclusions:

• Interbreed differences in cochlear function may exist in puppies.
• Variations in neural pathway maturation speed could explain the observed BAEP differences between Dalmatian and Beagle puppies.
• These findings highlight the importance of breed-specific considerations in canine auditory assessments.