RESUMO
Subdiafragmatic venous decompression during anhepatic stage of canine orthotopic liver transplantation attenuates portal and caval blood stasis and minimize hipoperfusion and metabolic acidosis observed with occlusion of portal and caval veins. During two hours, six dogs submitted to portal-jugular and caval-jugular passive shunts, with maintenance of arterial hepatic flow, were evaluated for pH, carbon dioxide tension (PCO2), base deficit (BD) and oxygen tension (PO2) in portal, caval and systemic arterial blood, as well as for increments of BD (DBD) in portal and caval blood. With a confidence level of 95 percent, the results showed that: 1. There were not changes of pH anDBD in portal and systemic arterial blood in the majority of studied times; 2. There was metabolic acidosis in caval blood; 3. The negative increments of BD (DBD) were higher in caval blood than in splancnic venous blood at T10, T30 and T105; and, 4. Deoxigenation of portal and caval blood were detected. Acid-base metabolism and oxigenation monitoring of subdiaphramatic venous blood can constitute an effective way to evaluate experimental passive portal-jugular and caval-jugular bypass in dogs.
Assuntos
Animais , Masculino , Feminino , Cães , Equilíbrio Ácido-Base/fisiologia , Veia Porta/metabolismo , Transplante de Fígado/métodos , Veia Cava Inferior/metabolismo , Fluxo Sanguíneo Regional/fisiologia , Veias Jugulares , Veia Porta/fisiologia , Veia Cava Inferior/fisiologiaRESUMO
The activity of receptor-operated Ca2+ channels (ROCCs) was studied in rat portal vein in L-thyroxine-induced experimental hyperthyroidism. The following parameters were evaluated: 1. NE-stimulated 45Ca influx. 2. CaCl2-induced contractile responses in Ca2+ free NE-stimulated tissues to calculate EC50 value of CaCl2. The NE (10(-6)mol) stimulated 45Ca influx and the mean EC50 value of CaCl2 did not differ significantly in portal veins isolated from hyperthyroid rats as compared to those of euthyroid control rats. The study revealed no significant change in the functional status of ROCCs in experimental hyperthyroidism.
Assuntos
Animais , Canais de Cálcio/metabolismo , Sinalização do Cálcio , Hipertireoidismo/induzido quimicamente , Masculino , Músculo Liso Vascular/metabolismo , Veia Porta/metabolismo , Ratos , Ratos Sprague-Dawley , Receptores Adrenérgicos alfa/metabolismo , Tiroxina/toxicidadeRESUMO
We present a case of portal and superior mesenteric venous gas in a 31-year-old diabetic woman with a left-sided retroperitoneal abscess. Five years prior to admission, patient was diagnosed with diabetes mellitus and developed emphysematous pyelonephritis, requiring nephrectomy on the left side. A CT examination showed air distributed throughout the portal venous system and superior mesenteric vein.