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The aim of the study was to determine the epidemiological prevalence of aortic stenosis (AS) among dogs in Poland. Among 287 dogs, diagnosed with congenital heart disease at the Department of Internal Diseases and the Clinic of Horses, Dogs and Cats, Faculty of Veterinary Medicine, at the Wroclaw University of Environmental and Life Sciences in Poland, in the years 2004-2011, there were 97 dogs with diagnosed AS. Diagnosis was based on clinical signs and physical examination, including auscultation and echocardiography (two-dimensional and Doppler). AS constituted 33.8% of all diagnosed congenital heart defects. In our clinic, aortic stenosis and pulmonic stenosis share the 1st place among the most commonly presented congenital malformations. Out of all AS cases diagnosed in the clinic, 65.6% were mild, 20.3% severe, and 14.1% moderate. The predominant form of AS was subaortic stenosis, with 90.7% affected dogs. Other types were less common: valvular aortic stenosis and supravalvular aortic stenosis accounted for 8.3% and 1% of all AS cases, respectively. Females seem to be less predisposed than males. Among various breeds, the sex predisposition seems to be significant in the Golden Retriever breed, in which 3 times more males than females are affected. The epidemiological prevalence of aortic stenosis among dogs in Poland is similar to that described in other European countries and America. Clinical signs usually do not appear in mild and moderate cases, so these dogs can live normally and reproduce for many years. In order to decrease the incidence of AS, it is important to do screening tests of predisposed breeds and exclude animals with all classes of this malformation from breeding.
The study has focused on the retrospective analysis of cases of coexisting congenital aortic stenosis (AS) and pulmonary artery stenosis (PS) in dogs. The research included 5463 dogs which were referred for cardiological examination (including clinical examination, ECG and echocardiography) between 2004 and 2014. Aortic stenosis and PS stenosis were detected in 31 dogs. This complex defect was the most commonly diagnosed in Boxers – 7 dogs, other breeds were represented by: 4 cross-breed dogs, 2 Bichon Maltais, 3 Miniature Pinschers, 2 Bernese Mountain Dogs, 2 French Bulldogs, and individuals of following breeds: Bichon Frise, Bull Terrier, Czech Wolfdog, German Shepherd, Hairless Chinese Crested Dog, Miniature Schnauzer, Pug, Rottweiler, Samoyed, West Highland White Terrier and Yorkshire Terrier. In all the dogs, the murmurs could be heard, graded from 2 to 5 (on a scale of 1-6). Besides, in 9 cases other congenital defects were diagnosed: patent ductus arteriosus, mitral valve dysplasia, pulmonary or aortic valve regurgitation, tricuspid valvedysplasia, ventricular or atrial septal defect. The majority of the dogs suffered from pulmonary valvular stenosis (1 dog had supravalvular pulmonary artery stenosis) and subvalvular aortic stenosis (2 dogs had valvular aortic stenosis). Conclusions and clinical relevance – co-occurrence of AS and PS is the most common complex congenital heart defect. Boxer breed was predisposed to this complex defect. It was found that coexisting AS and PS is more common in male dogs and the degree of PS and AS was mostly similar.
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