Peer-reviewed veterinary case report
Hearing test delays linked to Chiari malformation in Cavalier King
By Cole, Lynette K et al.·Published in American journal of veterinary research·2023·View original on PubMed →
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Original publication title: Chiari-like malformation in Cavalier King Charles Spaniels impacts brainstem auditory-evoked response latency results.
Plain-English summary
A group of 20 Cavalier King Charles Spaniels (CKCS) without obvious hearing issues underwent tests to check for hearing loss related to Chiari-like malformation (CM), a condition affecting the brain. The dogs were put under anesthesia for CT scans and MRI to assess their ear structures and the severity of CM. Results showed that 45% had a mild form (CM1) and 55% had a more severe form (CM2), with those having CM2 showing longer response times in hearing tests. This study helps veterinarians understand how CM can affect hearing in this breed, but the results were not always clear-cut.
People also search for: Cavalier King Charles Spaniel hearing loss · Chiari-like malformation in dogs · CKCS BAER testing results
Abstract
OBJECTIVE: To evaluate hearing loss in Cavalier King Charles Spaniels (CKCS), breed-specific brainstem auditory-evoked response (BAER) testing parameters are needed to help assess the Chiari-like malformation (CM) grade. The purpose of this study was to establish breed-specific BAER data and to determine if BAER indexes differed based on the CM grade. We hypothesized that there would be latency differences based on the CM grade. ANIMALS: 20 CKCS without apparent hearing abnormalities as assessed by the owners. PROCEDURES: Under general anesthesia, CKCS underwent a CT scan (to assess the middle ear), BAER testing, and MRI (to assess the grade of CM). RESULTS: No CKCS had CM0. Nine (45%) CKCS had CM1; 11 (55%) had CM2. All had at least 1 morphologic abnormality in waveforms. Absolute and interpeak latencies were reported for all CKCS and compared between CM grades. The median threshold for CKCS with CM1 was 39 and for CM2 was 46. Absolute latencies for CKCS with CM2 were consistently longer than those for CKCS with CM1 with the exception of waves II and V at 33 dB. Significant differences were found for wave V at 102 dB ( P = .04) and wave II at 74 dB (P = .008). Interpeak latency comparisons were inconsistent between CM1 and CM2. CLINICAL RELEVANCE: Breed-specific BAER data for CKCS with CM1 and CM2 were established. The results suggest that CM impacts BAER latency results, but the influence of the malformation is not always statistically significant or predictable.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/37236609/