Vein In Liver Transplantation Research Articles

Use of Polytetrafluoroethylene Graft in Reconstruction of Middle Hepatic Vein and Right Inferior Hepatic Vein in Liver Transplantation and Rate of Non-Thrombosis of the Vein Our Three-Year Results

Amaç: Canlı Vericili Karaciğer Nakli (CVKN)’nde, modifiye sağ lob takılan hastalarda kullanılan Polytetrafluoroethylene (PTFE) greftlerin zamana göre açık kalma oranları değerlendirilmiştir. Ayrıca açık kalma oranını etkileyen faktörler, erken tıkanma sonrası gelişebilecek sorunlar ve olası greft ilişkili komplikasyonlar incelenmiştir. Materyal ve Metod: 2013-15 yıllarında ameliyat edilen, yaşları 17-74 arasında değişen 168 hasta çalışmaya dahil edildi. Postoperatif takiplerde çekilen Multislice Bilgisayarlı Tomografi (MSBT)’lerin venöz fazları retrospektif olarak incelendi. Hastalara kullanılan PTFE greftlerin tıkanma zamanları ve bu greftlerin drene ettiği segmentteki konjesyon durumu değerlendirildi. Greft ilişkili komplikasyonlar, Greft Alıcı Ağırlık Oranı (GAAO) değerleri ve postoperatif 1 aylık laboratuar bulguları da çalışmaya dahil edildi. Bulgular: Kullanılan PTFE greft açık kalma oranlarının, kriyopresipiye greft çalışmalarıyla kıyaslandığında, daha düşük olduğu görüldü. Greft lokalizasyonuyla açık kalma süreleri arasında anlamlı farklılık bulunmadı. Hastaların boy, kilo, BMI, karaciğer greft ağırlığı (KGA) ve greft alıcı ağırlık oranı (GAAO) ile ilk konjesyon, ilk tıkanma ve tüm venlerin tıkandığı zaman arasında anlamlı korelasyon bulunmadı. GAAO değerleri ile takiplerde tromboze olan greftlerin açık kalma zamanları arasında korelasyon tespit edildi. Kullanılan PTFE greft çapı ile açık kalma süresi arasında anlamlı ilişki bulunmadı. Transplantasyon nedenlerine göre açık kalma durumuna da bakıldı ancak anlamlı bir fark bulunmadı. Sonuç: PTFE greftler erken dönem açık kalma oranlarının yüksek olması nedeniyle, kriyopresipiye greftlerin bulunmadığı şartlarda ancak mevcut komplikasyon potansiyelleri akılda tutularak rekonstrüksiyon amaçlı olarak kullanılabilir.

Liver transplantation for advanced hepatocellular carcinoma combined with portal vein tumor thrombus

Summary: Background: The advanced hepatocellular carcinoma combined with portal vein tumor thrombus(PVTT)once has been the contraindications of liver transplantation which has been changed recently attribute to the development of vascular surgery. However, PVTT confining the entire portal vein and cavernomatous transformation of PV (CTPV) remains a challenge for liver transplantation. This video shows our experience with removal of PVTT and anastomosis of the portal vein in liver transplantation with PVTT. Methods: A 53-year-old female patient with hepatitis B cirrhosis, Transcatheter Hepatic Arterial Chemoembolization has applied four months ago and Radiotherapy was applied one month ago. The CT scan demonstrated portal vein tumor thrombus as well as an arteriovenous fistula. This patient was successfully treated with orthotopic modified piggyback liver transplantation. The distal PV was clamped and then the transection of PV was performed to remove the PVTT after the PV was exposed completely. After that, IVC was partly clamped and the outflow of the graft was reconstructed in a side to side anastomosis. Then, we reconstructed the portal vein by end-to-end anastomosis. The hepatic artery was reconstructed at last. Results: The patient stayed for 7 days in ICU. The immunosuppression used were methylprednisolone, Fk506, and CellCept. The patient recovered smoothly and 15-day discharge after the operation. She has tumor-free survived for two years and survived now. Conclusion: Despite advanced hepatocellular carcinoma combined with portal vein tumor thrombus is not the indication for liver transplantation, this therapy can also give these end-stage patients a flash of hope.

Relationship Between Patients With or Without a History of Esophageal Varices Bleeding and the Changes in Hemodynamics During Inferior Vena Cava Clamping in Living Donor Liver Transplantation

BackgroundWhether the history of esophageal variceal bleeding (EVB) can be used clinically to predict the tolerability or hemodynamic instability during clamping of the inferior vena cava (IVC) and portal vein in liver transplantation is unknown and, therefore, needs to be elucidated. Patients and MethodsA total of 50 anesthesia charts of patients who underwent living donor liver transplantation were reviewed, analyzed and compared retrospectively. Patients without a history of EVB were classified as group 1 and patients with a history of EVB were classified as group 2. The numbers of patients with a decrease in cardiac index (CI) of ≥20%, ≥30%, or ≥40% from their preclamping values after IVC clamping were compared with a χ2, and a P value of .05 was regarded as statistically significant. ResultsThe measured hemodynamic parameters before and 5 minutes after clamping of the IVC and portal vein were all significantly different in comparison with the patient's preclamping values. The incidence of a decrease in CI of ≥20%, ≥30%, or ≥40% 5 minutes after clamping of the IVC and portal vein were not significantly different between groups. ConclusionsClamping of the portal vein and IVC without performing veno-venous bypass in living donor liver transplantation had a significant negative impact on CI in both groups due to the drastic reduction in the venous return. Statistical analysis revealed that a history of EVB affects hemodynamics in a manner similar to that in patients without history of EVB during IVC clamping.

Prevention and treatment of rethrombosis after liver transplantation with an implantable pump of the portal vein

Implantable pumps have been used to prevent deep vein thrombosis and other diseases. In this article, we report for the first time the prevention and treatment of rethrombosis of the portal vein in liver transplantation with an implantable pump of the portal vein. Four hundred four orthotopic liver transplantation cases were retrospectively reviewed and divided into 3 groups: portal vein thrombosis (PVT) patients with an implantable pump (n = 28), PVT patients without an implantable pump (n = 20), and patients without preexisting PVT (n = 356). The following parameters for the 3 groups of patients were calculated and compared: (1) preoperative parameters, including baseline data of the donors and recipients and times of graft ischemia; (2) intraoperative and postoperative parameters, including surgery time, red blood cell and plasma transfusion, platelet concentrate transfusion, bleeding and primary graft malfunction, and duration of the hospital and intensive care unit stays; and (3) follow-up information for the patency of the portal vein, rethrombosis rate, stenosis and reoperation (relaparotomy or retransplantation), in-hospital mortality, and actuarial 1-year survival rate. Among the 3 groups of recipients, no significant differences were detected in preoperative and intraoperative parameters. However, compared to PVT patients without an implantable pump, PVT patients with an implantable pump showed remarkable reductions in their postoperative hospital stay, rethrombosis, reoperation rate, and in-hospital mortality. An implantable pump of the portal vein in liver transplantation patients can prevent and facilitate the treatment of portal vein rethrombosis and is associated with a reduction of in-hospital mortality.

The use of a composite graft of iliac artery and inferior mesenteric vein in liver transplantation

Innovation may be required for satisfactory arterial reconstruction in liver transplantation, particularly when the vessels obtained from the donor are inadequate. We have used a composite graft of donor iliac artery and recipient inferior mesenteric vein (IMV) between the infrarenal aorta and donor hepatic artery. Postoperative liver function was satisfactory, with normal daily duplex ultrasound scans for the first 2 weeks. At 4 years follow up, graft function is normal, a duplex ultrasound scan shows normal arterial flow and no dilatation of the composite graft, and a magnetic resonance angiogram reveals no evidence of dilatation or thrombosis of the composite graft. This is one of the few reported cases in which a composite graft has been used to arterialize the allograft in liver transplantation. A composite graft of iliac artery and IMV provided a satisfactory outcome in this patient and may be a valuable addition to the arterial grafts available to the liver transplant surgeon.

Primary permanent arterialization of the portal vein in liver transplantation

Abstract Permanent total arterialization of the portal vein in liver transplantation has been described as a method of providing portal inflow after insufficient thrombectomy due to chronic occlusion of the portal-vein system. A specific problem is the restriction of the arterial inflow and its long-term adaptation after transplantation. We describe here the surgical techniques and clinical course of three patients who underwent portal-vein arterialization for liver transplantation. Two patients had an uneventful course. In one patient, a flow reduction by means of coil embolization of one arterial inflow branch was performed; thereafter, the patient recuperated well. Analysing the microcirculation of an arterialized graft in comparison with liver grafts with normal non-arterialized portal-vein inflow, we observed an increase in inter-sinusoidal distance and a decrease in sinusoidal red blood cell velocity. From a technical point of view, we recommend permanent portal-vein arterialization by an iliac artery graft interposition from the subdiaphragmatic aorta. The inflow to the portal vein can easily be reduced by the banding of the arterial graft interposition.