Retrospective Study of Tricuspid Valve Dysplasia in a UK Population of Dogs

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Abstract

Tricuspid valve dysplasia (T VD) is an uncommon congenital cardiac condition in the dog. Breed predispositions have been described and heritability shown in the Labrador retriever. Published data in UK dogs including survival times after development of congestive heart failure (CHF) are rare. The aim of this study was to determine breed prevalence of T VD and clinical, echocardiographic, electrocardiographic and survival characteristics in cases presented to a UK referral centre. The case records of the R(D)SVS Cardiopulmonary Service between 1998 and 2011 were reviewed. Echocardiographic criteria for TVD were tricuspid insufficiency (TI) along with subjective malformation of the TV apparatus and no other underlying cause. In total, 29 dogs were identified. Twelve dogs were male and 17 female. Age at initial diagnosis ranged from 2 months to 13 years. Twelve breeds were represented, the most prevalent being Labrador retriever (n = 7) and Border collie (n = 5). Compared to Kennel Club registrations, Labradors were not over-represented (P = 0.317) but Border collies were (P < 0.001). Reasons for presentation were investigation of a heart murmur (n = 21), suspected CHF (n = 7) or an arrhythmia (n = 5). Six dogs had Ebstein anomaly. Concurrent congenital abnormalities in 13 dogs included mitral valve dysplasia (n = 4), pulmonic stenosis (n = 3) atrial septal defect (n = 2), left-to-right shunting PDA (n = 1) and subaortic stenosis (n = 1). ECG recordings were available for 15 dogs. Splintered QRS complexes and suspected J waves were present in 4 dogs, right-axis deviation in 3 dogs and P wave abnormalities (including P mitrale) in 6 dogs. Recorded cardiac arrhythmias were atrial fibrillation in 7 dogs and atrial flutter and ventricular tachycardia in the same dog. Right-sided CHF was manifest in 11 dogs as ascites (n = 8), pleural effusion (n = 4) and pericardial effusion (n = 2). At the end of the study period, 20 dogs had died. Survival times ranged from 0–3696 days from the diagnosis of TVD and 0–2130 days from the diagnosis of CHF. In this population, TVD was uncommon, was often accompanied by other congenital cardiac defects and often led to right-sided CHF. Survival after decompensation was typically longer than that associated with acquired cardiac disease. Border collies were over-represented and further investigation of heritability is warranted. TVD may not be so prevalent in Labrador retrievers in the UK.
Original languageEnglish
Publication statusPublished - 2013
EventBritish Small Animal Veterinary Association (BSAVA) Congress 2013 - Birmingham, United Kingdom
Duration: 4 Apr 20137 Apr 2013

Conference

ConferenceBritish Small Animal Veterinary Association (BSAVA) Congress 2013
CountryUnited Kingdom
CityBirmingham
Period4/04/137/04/13

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