Progression of aortic stenosis in the boxer

Thirty-five boxers that had been referred to the Royal (Dick) School of Vet erinary Studies between 1989 and 1994 with left heart base murmurs and aort ic velocities greater than 1.5 m/second on Doppler echocardiography were re called for clinical examination and Doppler echocardiography between 1995 a nd 1996. Five dogs (14 per cent) showed an increase in murmur grade on repe at visit. Six dogs (17 per cent) showed an increase in aortic velocity of g reater than 20 per cent. Eight dogs (23 per cent) had developed aortic valv ular or subvalvular two-dimensional echocardiographic changes that had not been present at the initial visit. Seven dogs (20 per cent) had developed a ortic regurgitation, and three dogs (8 per cent) mitral regurgitation.