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2180 dogs were examined cardiologically on the incidence of atrioventricular valve disease.This basic total population breaks down into a group of 1386 dogs from the population of the der Klinik und Poliklinik für kleine Haustiere an der Freien Universität Berlin and 794 dogs from the breeding population.All of the animals were assigned to five groups in accordance with the auscultatory and electrocardiographic findings (Auscultation Groups A to E).Group A contains 1475 dogs showing no signs of a cardiac valve disease. The 336 animals in Group C are suspected of having atrioventricular valve insufficiency (AV-valve insufficiency). Group C consists of 318 dogs showing clear-cut signs of AVvalve insufficiency. 51 dogs with systolic semilunar murmurs are assigned to Groups D and E.As far as the breakdown along lines of breed is concerned, Group B contained cocker spaniels, terriers and track-hounds; in Groups B and C, however, poodles and dachshunds tended to predominate. Dogs of intermediate and large breeds, like for instance German shepherd dogs, utility dogs, British hunting dogs and racing dogs, on the other hand, are infrequent.Whereas the incidence of AV-valve insufficiency is higher for male dogs than for females, the female animals predominate in the group of animals suspected of having AV-valve insufficiency.Clear-cut cases of AV-valve insufficiency (Group C) occur less frequently in dogs four years of age and younger (n=26). 292 of the animals above this age were found to be diseased. InGroup B, only a tendency pointing toward an increase of suspected cases was established on the basis of this rough breakdown by age. The animals four-years old and younger in this group included 114 dogs; of those five-years old and older 222 animals were affected.In a comparative examination of geographically differentiated breeding regions, differences resulted both for Group B (Lower Bavaria: 25.3%, Berlin: 24.4%, Northwest Germany: 8.0%) and for Group C (Lower Bavaria: 8.7%, Berlin: 8.0%, Northwest Germany: 4.4%).As far as an allocation of auscultated murmurs to valve regions is concerned, the cases of mitral valve insufficiency predominated; they were followed by the cases of combined AVvalve insufficiency. Isolated cases of tricuspid insufficiency are, on the other hand, infrequent.The voltage and time values from 1459 evaluated standard ECGs were verified with the aid of the multiple t-test. Here, significant differences were found for the PII-wave amplitudes between Groups B and C and for the RI, wave amplitudes and heart rate between Groups A and C and Groups B and C. Group C has the highest percentage of dogs with cardiac arrhythmias.