Navegando por Palavras-chave "arteriovenous fistula"
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- ItemSomente MetadadadosComparative blood flow study of arteriovenous fistulae in canine femoral arteries: Modified latero-lateral and end-lateral techniques(Blackwell Science Inc, 2000-03-01) Galego, S. J.; Goldenberg, S.; Ortiz, J. P.; Gomes, P. D.; Ramacciotti, E.; Universidade Federal de São Paulo (UNIFESP)The aim of this study was to evaluate the blood flow of an arteriovenous fistula comparing the modified latero-lateral (LLM) and end-lateral (TL) techniques in canine femoral arteries. Ten mongrel dogs were submitted to 2 arteriovenous fistulae each, with a LLM on one side and a TL procedure on the other side. Cranial and caudal average blood flow as well as average venous flow were measured by an electronic fluxometer 15, 20, and 25 min after surgery. Mann-Whitney, Friedman, and Wilcoxon nonparametric tests were used for data analysis (alpha less than or equal to 0,05). Femoral artery flow, cranial to the fistula, was increased 5 1/2 times in both groups. in the femoral artery caudal to the fistula, the flow in the majority of the animals was reversed 1.3 times using the TL technique and 2 times using the LLM technique. the average flow in the cranial vein was statistically different with an improved flow of 7.4 times versus 6.8 times for the LLM technique. These results suggest that LLM arteriovenous fistula in dogs leads to a larger venous flow than in the TL arteriovenous fistula and the reverse caudal arterial flow in the latero-lateral technique. the flow behavior (laminar or turbulent) in the 2 types of arteriovenous fistula was studied in terms of singular head loss.
- ItemAcesso aberto (Open Access)Fístula arteriovenosa safeno-femoral superficial como acesso à hemodiálise: descrição de técnica operatória e experiência clínica inicial(Sociedade Brasileira de Angiologia e de Cirurgia Vascular (SBACV), 2005-01-01) Corrêa, João Antônio; Pires, Adilson Casemiro; Kafejian, Ohannes; Miranda Jr., Fausto [UNIFESP]; Galego, Sidnei José; Yamazaki, Yumiko Regina; Fujii, Eliane Yumi; Fioretti, Alexandre César; Faculdade de Medicina do ABC; Universidade Federal de São Paulo (UNIFESP)OBJECTIVE: To describe a technique for creating an arteriovenous fistula as an access to hemodialysis, evaluating its technical aspects, efficacy and complications. METHOD: From August 1998 to October 2000, 16 superficial saphenofemoral arteriovenous fistulas were performed in 15 patients. These procedures were used in patients without access options in upper limbs. The surgical technique consisted of an anteriorization and a superficialization of the saphenous vein anastomosed to the superficial femoral artery in the distal portion. The superficial saphenofemoral arteriovenous fistulas were evaluated with regard to puncture, appropriate flow, spontaneous venous pressure, dialysis adequacy and intraoperative complications. RESULTS: There were no intraoperative complications and all the fistulas could be successfully concluded. There was one early death, but the other fistulas were able to the hemodialysis in the 30th postoperative day. Fourteen fistulas were used; in the evolution, three patients were submitted to renal transplant, four presented thrombosis and two presented puncture pseudoaneurysm. CONCLUSION: Superficial saphenofemoral arteriovenous fistulas proved to be a good alternative for patients who do not have other possibilities of vascular access in upper limbs, thus allowing an effective hemodialysis treatment, with a good patency rate at medium term.
- ItemSomente MetadadadosFistula size and hemodynamics: an experimental model in canine femoral arteriovenous fistulas(Wichtig Editore, 2007-01-01) Ramacciotti, Eduardo; Galego, Sidnei José; Gomes, Marise; Goldenberg, Saul [UNIFESP]; Gomes, Paulo de Oliveira [UNIFESP]; Ortiz, Jayme Pinto; Universidade Federal de São Paulo (UNIFESP)Purpose: The objective was to evaluate the impact of anastomosis diameter on blood flow in an arteriovenous fistula (AVF), comparing two different anastomosis sizes with a modified side-to-side technique in canine femoral arteries.Methods: Ten mongrel dogs were subjected to two AVFs each, both using a modified side-to-side technique. On one side, the anastomosis diameter was 1.5 times the arterial diameter and on the other side 3.0 times the arterial diameter. Mean proximal and caudal blood flow and mean venous flow were measured using an electronic flowmeter 15, 20 and 25 min after surgery. The Mann-Whitney, Friedman and Wilcoxon non-parametric tests were used for data analysis (alpha <= 0.05).Results: Femoral artery flow cranial to the fistula became 5.6 times greater in the 1.5 arterial diameter group, and 8.4 times greater in the 3.0 arterial diameter group, when compared to initial arterial flow. The mean flow in the cranial vein was greater in the 3.0 group (10.09 times greater vs. 6.46 times greater in the 1.5 group). Both in the proximal artery and in the vein there was a significantly greater flow in the group with the larger anastomosis diameter (Wilcoxon test). In the femoral artery caudal to the fistula, the flow in most of the animals was reversed: 3.5 times greater in the 1.5 group and 1.2 times greater in the 3.0 group, without statistical difference.Conclusions: These results suggest that 3.0 times the arterial diameter for the AVF size in dogs leads to greater venous flow than with 1.5 times the arterial diameter, without increasing the reversed flow.