Ying Niu

Central South University, Changsha, Hunan, China

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Publications (6)4.68 Total impact

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    ABSTRACT: Delayed graft function (DGF) is common in kidney transplants from organ donation after cardiac death (DCD) donors. It is associated with various factors. Determination of center-specific risk factors may help to reduce the incidence of DGF and improve the transplantation results. The aim of this study is to define risk factors of DGF after renal transplantation. From March 2010 to June 2012, 56 cases of recipients who received DCD kidneys were selected. The subjects were divided into two groups: immediate graft function (IGF) and DGF groups. Transplantation factors of donors and recipients as well as early post-transplant results of recipients were compared between the two groups. On univariate analysis, preoperative dialysis time of recipients (P < 0.001), type of dialysis (P = 0.039), human leucocyte antigen (HLA) mismatch sites (P < 0.001), the cause of brain death (P = 0.027), body mass index (BMI) of donors (P < 0.001), preoperative infection (P = 0.002), preoperative serum creatinine of donors (P < 0.001), norepinephrine used in donors (P < 0.001), cardiopulmonary resuscitation (CPR) of donors (P < 0.001), warm ischemia time (WIT) (P < 0.001) and cold ischemia time (CIT) (P < 0.001) showed significant differences. Recipients who experienced DGF had a longer hospital stay, and higher level of postoperative serum creatinine. Multiple risk factors are associated with DGF, which had deleterious effects on the early post-transplant period.
    Chinese medical journal 11/2012; 125(21):3782-5. · 0.90 Impact Factor
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    ABSTRACT: The piggy-back caval anastomosis technique is widely used in orthotopic liver transplantation although it carries an increased risk of complications, including outflow obstruction and Budd-Chiari syndrome. The aim of this study is to clarify the anatomy and variations of hepatic veins (HVs) draining into the inferior vena cava (IVC), and to classify the surgical techniques of piggy-back liver transplantation (PBLT) based on the anatomy of HVs which can reduce the occurrence of complications. PBLT was performed in 248 consecutive cases at our hospital from January 2004 to August 2011. The anatomy of recipients' HVs was determined when removing the native diseased livers. Both anatomy of HVs and short HVs draining into the IVC were recorded. These data were collected and analyzed. We classified anatomic variations of HVs in the 248 livers into five types according to the way of drainage into the IVC: type I (trunk type of left and middle HVs), 142 (57.3%) patients; type II (trunk type of right and middle HVs), 54 (21.8%); type III (trunk type of left, middle and right HVs), 14 (5.6%); type IV (non-trunk type of left, middle and right HVs), of which, type IVa, 16 (6.5%), in the same horizontal plane; type IVb, 18 (7.3%), in different horizontal planes; and type V (segment type), 4 (1.6%). The patients whose HVs anatomy belonged to types I, II and III underwent classical piggy-back liver transplantation. Type IVa patients had classical PBLT via HV venoplasty prior to piggy-back anastomosis, while type IVb patients and type V patients could only have modified PBLT. This study demonstrates that HVs can be classified according to the anatomy of their drainage into the IVC and we can use this classification to choose the best operative approach to PBLT.
    Hepatobiliary & pancreatic diseases international: HBPD INT 08/2012; 11(4):429-33. · 1.26 Impact Factor
  • Ying Niu, Qi-Fa Ye
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    ABSTRACT: The concept of "ischemic postconditioning" was first raised in 2002, and the following 5 year research shows that it can protect organs from reperfusion injury. Although the mechanism of ischemic postconditioning is similar to ischemic preconditioning in many ways, it still has its own characteristics. Reperfusion injury is an inevitable problem in organ transplantation. It may accelerate the function recovery of the transplants to lessen the reperfusion injury. So ischemic postconditioning may have a fine prospect in organ transplantation for its good controllability during reperfusion. This article is going to briefly introduce the distinct mechanisms of ischemic postconditioning to protect organs from reperfusion injury and approach the possibilities of its application in organ transplantation.
    Zhong nan da xue xue bao. Yi xue ban = Journal of Central South University. Medical sciences 07/2008; 33(6):548-52.
  • Zhonghua gan zang bing za zhi = Zhonghua ganzangbing zazhi = Chinese journal of hepatology 05/2008; 16(4):317-8.
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    ABSTRACT: Bile leak remains a main complication in liver transplantation patients with poor biliary tract conditions, mainly caused by an insufficient blood supply or dysplasia of the biliary tract. Although Roux-en-Y modus operandi can be adopted, the risk of other complications of the biliary tract such as infection increases. Using pedicled greater omentum flaps to wrap the anastomotic stoma, which increases the biliary tract blood supply, may reduce the incidence of bile leak. Fourteen patients undergoing piggy-back liver transplantation and having poor biliary tract conditions were treated with pedicled greater omentum flaps to wrap the anastomotic stoma of the biliary tract. Their clinical data were analyzed retrospectively. Of the 14 patients, only one (7.1%) had a mild bile leak on the 8th day post-operation and fully recovered after symptomatic treatment. The other patients had no biliary complications. Using pedicled greater omentum flaps to wrap the anastomotic stoma of the biliary tract is an effective way to prevent bile leak in liver transplantation patients, especially those with poor biliary tract conditions. However, experience with this surgical technique still needs to be further explored.
    Hepatobiliary & pancreatic diseases international: HBPD INT 11/2007; 6(5):470-3. · 1.26 Impact Factor
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    ABSTRACT: Ischemia/reperfusion is the main cause of hepatic damage in liver transplantation. Immediate early genes (IEGs) encode proteins can regulate expression of cellular response genes after injury, and is associated with tissue repair and cell apoptosis. The purpose of this research was to investigate the effects of preconditioning on expression of immediate early genes c-fos and c-jun following hepatic ischemia/reperfusion (IR) and its roles in cellular regeneration and apoptosis. Ninety-six Wistar rats were randomly divided into IR group and hepatic ischemic preconditioning (IPC) group, and each group was further divided into eight sub-groups (n=6). The model of partial liver ischemia/reperfusion was used. The rats were subjected to 60-minute liver ischemia, preceded by 10-minute preconditioning. After 0-, 0.5-, 1-, 2-, 4-, 8-, 12-, 24-hour reperfusion, the serum and liver tissue in each group were collected to detect the level of serum ALT/AST, liver histopathology, expression of c-fos, and c-jun mRNA. Flow cytometer was used to detect Ki67 and Sub-G1 as the quantity indicators of cell regeneration and apoptosis respectively. Compared with IR group, IPC group showed a significantly lower ALT/AST level in 0.5-hour sub-group to 8-hour sub-group (P<0.05). Ki67 elevated significantly at 0.5, 1, 2 hours, but decreased significantly at 24 hours (P<0.05). Ap index decreased significantly after 1-hour reperfusion (P<0.05). Expressions of c-fos and c-jun mRNA were low, especially c-jun at 0.5, 1 and 2 hours after reperfusion. Ischemic preconditioning can protect liver cells against ischemia/reperfusion injury, and this protective effect may be related to influence transcription levels of c-fos and c-jun.
    Hepatobiliary & pancreatic diseases international: HBPD INT 05/2005; 4(2):197-202. · 1.26 Impact Factor