Avaliação ecodopplercardiográfica da função diastólica em cães da raça Boxer Ecodopplercardiographic evaluation of diastolic function in Boxer dogs

Foram avaliados os principais índices diastólicos, inclusive a velocidade de propagação mitral (Vp), em 36 cães sadios da raça Boxer, 18 de cada sexo, de idade entre um ano e meio e seis anos. A relação raiz aórtica e átrio esquerdo medida no modo B foi de 1,17&plusmn;0,11. Os picos de velocidades das ondas de enchimento atrial esquerdo foram: sistólica 31,41&plusmn;6,87cm/s, diastólica (D) 73,85&plusmn;17,04cm/s e de reversão atrial 28,90&plusmn;8,33cm/s. A relação das ondas de enchimento ventricular inicial (E) e atrial (A) foi 1,58&plusmn;0,19 na valva mitral e de 1,62&plusmn;0,29 na valva tricúspide. Entre os índices avaliados, a Vp só se correlacionou fracamente (r=0,39) com as ondas E e A mitrais e com a onda D, mostrando-se um índice, relativamente, independente. A Vp não apresentou diferença significativa entre os sexos nem entre examinadores. A Vp diminuiu com o aumento da idade e exibiu valor médio, neste estudo, de 99,73&plusmn;16,06cm/s.<br>Major diastolics indexes, including the mitral propagation velocity (Vp), were evaluated in 36 healthy Boxer dogs, 18 males and 18 females, aging from 1.5 to 6-years-old. The aortic root and left atrium ratio, measured in B mode, was 1.17&plusmn;0.11. The peaks of velocity of waves of the left atrium filling were: systolic 31.41&plusmn;6.87cm/s, diastolic 73.85&plusmn;17.04cm/s and atrial reversal 28.90&plusmn;8.33cm/s. The ratios of the waves of initial ventricular filling were 1.58&plusmn;0.19 to mitral valve and 1.62&plusmn;0.29 to tricuspid valve. From the evaluated indexes, the Vp was only weakly correlated (r=0.39) with E and A waves of mitral valve and with D, showing itself, relativity, as an independence index. Regarding to the Vp, no significant differences were seen between the gender of the animals and among the observers. The Vp decreased as the age increased, showing mean values of 99.73&plusmn;16.06cm/s.