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Foram realizados o estudo morfométrico e o estudo hemodinâmico da veia porta em vinte cães clinicamente normais, de idade igual e inferior a 120 dias e em quatorze cães portadores de shunt portossistêmico, de idades entre 90 e 360 dias. Nos cães do grupo controle, as margens hepáticas apresentaram-se entre 1,50cm e 3,00cm caudalmente à margem costal. Os diâmetros médios da veia porta (VP), veia cava caudal (VCC) e aorta abdominal (AO) obtidas foram respectivamente, 0,38cm, 0,37cm e 0,41cm. As proporções entre os diâmetros médios VP/VCC e VP/AO apresentaram médias de 1,10 e 0,94, respectivamente. As médias das áreas da VP, VCC e AO resultaram respectivamente em 0,12cm2 , 0,11cm2 e 0,14cm2. No estudo hemodinâmico da VP destes animais, utilizando-se o ultrassom Doppler, a velocidade média de fluxo sangüíneo portal (VMFSP) mediu 17,76cm/s. A média de fluxo sangüíneo portal (FSP) resultou em 83,11ml/min/kg. O índice de congestão (IC) apresentou média de 0,006. Para o grupo de cães portadores de shunt portossistêmico, o fígado apresentou redução de seu volume, sendo as margens hepáticas visibilizadas entre 1,00cm e 2,00cm cranialmente à margem costal. No estudo morfométrico, as médias dos diâmetros médios obtidos de VP, VCC e AO resultaram respectivamente em 0,40cm, 0,74cm e 0,56cm. As proporções entre os diâmetros médios VP/VCC e VP/AO resultaram respectivamente em 0,54 e 0,69. As médias das áreas de VP, VCC e AO resultaram respectivamente em 0,14cm2, 0,31cm2 e 0,25cm2. Ao ultrassom Doppler a VMFSP mediu 22,29cm/s e a média do IC da VP obtido foi de 0,006.The morphometry and haemodynamic aspects of portal vein were studied in 20 normal dogs with less than 120 days of age and in 14 dogs presenting portosystemic shunting with ages between 90 and 360 days. In the control group the hepatic margins were seen 1.50cm to 3.00cm caudal to the costal margin. Collected data indicated that the mean diameter of portal vein (VP), caudal vena cava (VCC) and abdominal aorta (AO) measured respectively, 0.38cm, 0.37cm and 0.41cm. The VP/VCC and VP/AO mean ratios were respectively, 1.10 and 0.94. The average of VP, VCC and AO areas were respectively, 0.12cm(2), 0.11cm(2) and 0.14cm(2). The haemodynamic of portal vein was studied by ultrasound Doppler and the mean velocity of portal blood flow (VMFSP) measured was 17.76cm/s. It was verified that portal blood flow (FSP) average was 83.11ml/min/kg and the congestion index (IC) average was 0.006. In the group of animals presenting portosystemic shunting, the hepatic margins were seen 1.00cm to 2.00cm cranial to the costal margin. The morphometry of VP, VCC and AO presented a mean diameter of 0.40cm, 0.74cm and 0.56cm, respectively. The VP/VCC and VP/AO mean ratios were respectively, 0.54 and 0.69. The average of VP, VCC and AO areas were respectively, 0.14cm(2), 0.31cm(2) and 0.25cm(2). The haemodynamic study demonstrated that the VMFSP measured was 22.29cm/s and the IC average was 0.006

Avaliação morfométrica e hemodinâmica comparativa dos vasos envolvidos no shunt portossistêmico congênito em cães