Objective To study the characteristics of its pathologic and neurophysiologic changes of a ani-mal model of cervical spinal cord compression, and to explore the relationship between the severity of spinal cord inju-ry and its functions. Methods Thirty-two rabbits were divided into 4 groups randomly. A catheter was inserted intothe vertebral canal and a balloon was inflated to compress spinal cord in epidural space. According to the diameter ofballoon, the animals were divided into 4 groups (A, B, C, D group), Each group consisted of 8 rabbits. The corti-cal somatosensory evoked potential (CSEP) and motor evoked potential (MEP) were used to assess neurologicalfunction. Motor function behavior was scored before and on 1, 3, 7 and 14 days after surgery. Histological observa-tions were performed, pathological changes were observed by light and electron microscope. Results Spinal cordcompression resulted in a gradual increase of the peak latency and significant decrease of the peak amplitude. The la-tency and amplitude of MEP were changed more dramatically than those of CSEP. The result indicated that MEP wasmore sensitive than CSEP to the compression. Analysis also revealed that the severer the pathologic changes, the lon-ger the latency and the lower the amplitude of the evoked potentials. Conclusion The animal model presented inthis paper was simple and standardized. Evoked potentials as a noninvasive technique have great value in monitoringspinal cord function. The variance of amplitude and the latency in significantly correlate with the degree of compres-sion of the spinal cord.

Objective To investigate the clinical effect of the free fibula composite tissue flap transplantation to repair the first metatarsal bone with soft tissue defect on foot.Methods From August, 2008 to August, 2013, 6 patients with the first metatarsal bone and soft tissue defect on foot were treated with transplantation of free fibula composite tissue flap.The causes: 2 cases in traffic accident injury, 4 cases in machine injury;3 cases with traumatic defect, and septic defect in 3 patients.Of the 6 cases, the fibular length with transplantation was 6 cm to 12 cm, and the flap area was 8 cm × 5 cm-18 cm × 16 cm;All the cases were followed-up in 3, 6, 12 months postoperatively to observe the fracture healing, and to assess injured limb function in 1 year postoperatively.Results All cases were followed up 12-24 months, and average of 14 months;All the flaps survived, and the metatarsal bone and fibula healing was good visibly in half a year, The surgery function were assessed according to Maryland's scale, and the excellent were 2 and the good were 4.Conclusion The transplantation of free fibula composite tissue flap to repair the first metatarsal bone with soft tissue defect on foot is a safe and effective strategy, and it has the advantages such as covering the wound at foot approvingly, one-time rebuild repair foot weight bearing area and the surrounding soft tissue defect, shorten the treatment cycle, for small area damage in donor area, and the function postoperative is good, etc.

Objective To evaluate the effect of different techniques of hepatic artery reconstruction on postoperative hepatic artery complications and clinical prognosis in liver transplantation. Methods Clinical data of 140 liver transplant recipients were retrospectively analyzed. All recipients were divided into the conventional hepatic artery reconstruction group (n=123) and special hepatic artery reconstruction group (n=17) according to hepatic artery reconstruction methods. Intraoperative and postoperative clinical indexes, the incidence of postoperative hepatic artery complications and survival rate were compared between two groups. Results The alanine aminotransferase (ALT) and aspartate aminotransferase (AST) levels at postoperative 1 d, total bilirubin (TB) at postoperative 7 d and prothrombin time international normalized ratio (PT-INR) at postoperative 30 d in special hepatic artery reconstruction group were higher than those in conventional hepatic artery reconstruction group, and the differences were statistically significant (all P < 0.05). There were no significant differences in the operation time, anhepatic phase, intraoperative blood loss, intraoperative transfusion volume of red blood cells, cold or warm ischemia time, the length of intensive care unit (ICU) stay, the length of hospital stay and postoperative blood flow of liver allograft between two groups (all P > 0.05). In the conventional hepatic artery reconstruction group, 5 recipients developed hepatic artery complications, whereas no hepatic artery complications occurred in the special hepatic artery reconstruction group, with no significant difference between two groups (P > 0.05). In the special hepatic artery reconstruction group, the 1-, 3- and 5-year cumulative survival rates were equally 82.4%, compared with 85.0%, 78.9% and 75.6% in the conventional hepatic artery reconstruction group, respectively. There was no significant difference between two groups (all P > 0.05). Conclusions When hepatic artery variations and (or) lesions are detected in donors and recipients, use of special hepatic artery reconstruction may effectively restore the hepatic arterial blood flow of liver allograft after liver transplantation, and will not affect the incidence of hepatic artery complications and survival rate of the recipients following liver transplantation.

Objective To investigate the application value of the fluorescence quantitative PCR(qPCR)melting curve method in the detection of clarithromycin(23S rRNA)and quinolone(gyrA)resistant genes of Helicobacter pylori(Hp)in fecal samples.Methods A total of 1 176 untreated patients who underwent gastroscopy and were Hp positive proved by rapid urease test(RUT)were enrolled in the study.Their gastric mucosal and fecal samples were collected.The E-test method was used to analyze the clarithromycin and quinolone resistant phenotypes of Hp in gastric mucosal samples.The qPCR melting curve method was used to detect the clarithromycin and quinolone resistant genotypes of Hp in fecal samples.The consistency of the results obtained by the two methods was evaluated by the Kappa test.In addition,the nucleic acids were extracted from the fecal samples with Hp positive,and the Hp 23S rRNA and gyrA resistance mutation genes were detected by the qPCR melting curve method and Sanger sequencing,respectively.The consistency of the results obtained by the two methods was compared.Results In the study of clarithromycin resistance,a total of 934 valid samples were obtained.Among them,453 samples had positive resistance phenotype and 481 had positive resistance genotype,with a positive consis-tency rate of 93.38%(95%CI:90.70%～95.32%).In the study of quinolone resistance,a total of 909 valid samples were obtained.Among them,426 samples had positive resistance phenotype and 413 had positive resistance genotype,with a positive consistency rate of 86.85%(95%CI:83.31%-89.74%).In the comparative study,986 valid samples were detected for Hp 23S rRNA gene.Among them,514 samples were resistance positive detected by the qPCR melting curve method and 509 by Sanger sequencing,with a positive consistency rate of 96.27%(95%CI:94.24%-97.60%).Similarly,895 valid samples were detected for Hp gyrA gene.Among them,422 samples were resistance positive detected by the qPCR melting curve method and 405 by Sanger sequencing,with a positive consis-tency rate of 95.80%(95%CI:93.38%-97.36%).Conclusion The qPCR melting curve method can detect Hp 23S rRNA and gyrA in fecal samples,which has certain clinical application value for predicting the resistance of Hp.