FETCH-LAB, Department of Communication Sciences and Disorders, College of Allied Health Sciences, University of Cincinnati, 119 French East Building, Cincinnati, OH 45267-0379, USA.
Physiol Behav. 2013 Feb 17;110-111:190-7. doi: 10.1016/j.physbeh.2012.12.006. Epub 2012 Dec 21.
Accurate assessment of canine hearing is essential to decrease the incidence of hereditary deafness in predisposed breeds and to substantiate hearing acuity. The Brainstem Auditory Evoked Response (BAER) is a widely accepted, objective test used in humans and animals for estimation of hearing thresholds and deafness diagnosis. In contrast to humans, testing and recording parameters for determination of normal values for canine hearing are not available. Conflicting information concerning breed and head size effects on canine BAER tests are major contributors preventing this normalization. The present study utilized standard head measurement techniques coupled with BAER testing and recording parameters modeled from humans to examine the effect canine head size and breed have on BAER results. Forty-three adult dogs from fourteen different breeds had head size measurements and BAER tests performed. The mean latencies compared by breed for waves I, II, III, IV, and V were as follows: 1.46±0.49 ms, 2.52±0.54 ms, 3.45±0.41 ms, 4.53±0.83 ms and 5.53±0.43 ms, respectively. The mean wave I-V latency interval for all breeds was 3.69 ms. All dogs showed similar waveform morphology, structures, including the presence of five waves occurring within 11 ms after stimulus presentation and a significant trough occurring after Wave V. All of the waveform morphology for our subjects occurred with consistent interpeak latencies as shown by statistical testing. All animals had diagnostic results within the expected ranges for each wave latency and interwave interval allowing diagnostic evaluation. Our results establish that neither differences in head size nor breed impact determination of canine BAER waveform morphology, latency, or hearing sensitivity for diagnostic purposes. The differences in canine head size do not have a relevant impact on canine BAERs and are not clinically pertinent to management or diagnostic decisions.
准确评估犬只的听力对于减少易感品种遗传性耳聋的发生率以及证实听力敏锐度至关重要。脑干听觉诱发电位（BAER）是一种广泛应用于人类和动物的可接受的客观测试方法，用于估计听力阈值和耳聋诊断。与人类不同，用于确定犬只听力正常值的测试和记录参数尚不可用。有关品种和头部大小对犬只 BAER 测试影响的相互矛盾的信息是阻止这种标准化的主要因素。本研究利用标准头部测量技术与 BAER 测试和记录参数相结合，这些参数是从人类模型中得出的，旨在研究犬只头部大小和品种对 BAER 结果的影响。来自 14 个不同品种的 43 只成年犬进行了头部大小测量和 BAER 测试。按品种比较的平均潜伏期为：I 波为 1.46±0.49ms，II 波为 2.52±0.54ms，III 波为 3.45±0.41ms，IV 波为 4.53±0.83ms，V 波为 5.53±0.43ms。所有品种的 I-V 平均潜伏期为 3.69ms。所有犬只均显示出相似的波形形态、结构，包括在刺激后 11ms 内出现的五个波和 V 波后的一个明显的低谷。通过统计测试，我们的研究对象的所有波形形态均具有一致的峰间潜伏期。所有动物的诊断结果均在每个波潜伏期和波间间隔的预期范围内，允许进行诊断评估。我们的结果表明，头部大小的差异和品种均不会影响犬只 BAER 波形形态、潜伏期或听力敏感度的确定，这对于诊断目的而言。犬只头部大小的差异对犬只 BAER 没有相关影响，对于管理或诊断决策没有临床意义。
