Abstract: Objective To investigate the effects of haemopoietic stem cell mobilization on vein graft patency and intimal hyperplasia of anastomosis. Methods Twentyfour New Zealand rabbits were randomly divided into experimental group and control group, 12 rabbits in each group. A double side of carotid arteryvein transplantation model was made in each rabbit. One side of vein graft was digested by 0.25% trypsin for complete endothelial denudation before transplantation. Recombinant human granulocyte colonystimulating factor was given by subcutaneous injection 24 hours after operation, once per day in successive 10 days in experimental group, saline was given in the same way in control group. Bone marrow stem cells mobilization was observed after operation, including karyote counts and mononuclear cell proportion in peripheral blood. The patency rate of vein grafts and the degree of anastomosis intimal hyperplasia were observed too. Results The karyote counts (t=8.406,P=0.000)and mononuclear cell proportion(t=31.267,P=0.000) in peripheral blood of experimental group increased significantly 5 days after operation than those in control group. The vein grafts with intact endothelium had higher patency rate in both groups. In the vein grafts with complete endothelial denudation, the patency rate were obviously lower, but it was higher in experimental group than those in control group (67% vs. 30%). In the end of experiment, the pulsatility index of the vein grafts anastomosis with complete endothelial denudation was lower in experimental group than that in control group(t=2.958,P=0.009). Pathological examination showed that various degrees of intimal hyperplasia in all anastomoses of vein grafts were observed 4 weeks after operation. The degree of anastomosis intimal hyperplasia was more severe in vein grafts with complete endothelial denudation. Compared with control group, re-endothelization occurred completely in vein grafts with complete endothelial denudation of experimental group and the degree of anastomosis intimal hyperplasia was relatively lower (Plt;0.05). Conclusion Haemopoietic stem cell mobilization can provide protective effects on vein grafts by accelerating reendothelization which might increase vein grafts patency rate in the near future after operation and reduce anastomosis restenosis caused by intimal hyperplasia.
Although the evidence from randomized controlled trials (RCTs) is regarded as a golden standard, it often fails to be applied in clinical practice for lack of generalizability. Evidence from either RCTs or non-RCTs is mutually complementary and referred. Different designs are suitable for different stages and can resolve different issues. During evaluation of an intervention, the proper research design should be selected in accordance with the objective, feasibility, and merits and limitations of different design modes.
ObjectiveTo evaluate the medium-and long-term effectiveness of the 3rd-generation ceramic-on-ceramic total hip arthroplasty (THA) for end-stage hip disease. MethodsA retrospective analysis was made on the clinical data of 142 patients (148 hips) who underwent the 3rd-generation ceramic-on-ceramic THA between May 2001 and May 2005. There were 78 males and 64 females, aged 57.2 years on average (range, 23-81 years). Preoperative diagnosis was avascular necrosis of femoral head in 73 patients (77 hips), degenerative osteoarthritis in 35 patients (36 hips), femoral neck fracture in 18 patients (18 hips), rheumatoid arthritis in 14 patients (15 hips), and septic hip sequelae in 2 patients (2 hips). The preoperative Harris hip score was 58.3±12.9. ResultsAll incisions healed by first intention without complication. All patients were followed up 8.8 years on average (range, 7-12 years). At the last follow-up, the Harris hip score (92.5±10.2) was significantly higher than that at pre-operation (t=-25.29, P=0.00). At the last follow-up, there were 4 hips with groin pain, 6 hips with thigh pain. Complications occurred in 6 cases (6 hips), including loosening cups in 2 hips, hip dislocation in 2 hips, ceramic head fracture in 1 hip, and squeaking in 1 hip. The revision rate was 1.35% (3/148). X-ray film showed that acetabular cup loosening in 2 hips, discontinuous radiolucent line in 4 hips, and new bone formation in 88 hips; discontinuous radiolucent line around femoral component was observed in 25 hips, endosteal new bone formation in 95 hips, cortical bone hypertrophy in 2 hips, and femoral component subsidence in 9 hips (less than 2 mm). ConclusionThird-generation ceramic-on-ceramic THA is an effective treatment for end-stage hip disease, and can achieve satisfactory medium-and long-term effectiveness and a high implant survival rate.
ObjectiveTo monitor surgical quality and analyze learning curve of minimally invasive mitral valve replacement (MVR)through right minithoracotomy with cumulative sum analysis (CUSUM analysis). MethodsClinical data of 60 consecutive patients who underwent minimally invasive MVR through right minithoracotomy in the Fourth Affiliated Hospital of Guangxi Medical University from June 2011 to April 2013 were retrospectively analyzed. There were 32 male and 28 female patients with their age of 28-53 (34.67±7.11)years and their heart function ranging from NYHA class Ⅱ to Ⅳ. There were 31 patients with mitral stenosis (MS), 19 patients with mitral regurgitation (MR), and 10 patients with MS and MR. According to the surgical sequence, all the patients were divided into 3 groups (group A, B and C)with 20 patients in each group. Surgical outcomes were compared among the 3 groups, and surgical quality was analyzed with descriptive statistics and CUSUM curves. ResultsAortic cross-clamp time, cardiopulmonary bypass time and operation time of group C were significantly shorter than those of group A and group B (aortic cross-clamp time of group C vs. group A:50.35±2.30 minutes vs. 66.15±8.38 minutes; operation time of group C vs. group B:167.50±4.63 minutes vs. 178.60±4.49 minutes, P < 0.05). In-hospital mortality was 3.3% (2/60). CUSUM analysis showed a significant learning curve effect, although surgical quality remained in control during the study period. Surgical failure rate was lower than 80% after about 45 operations, indicating that failure rate was 10% lower than expectation. ConclusionMinimally invasive MVR is safe and reliable, and CUSUM analysis is a simple statistical method to monitor surgical quality.