Objective To understand the plasma protein differential expression before and after cardiopulmonary bypass (CPB)through conducting the comparative proteomics study on rats in order to find the plasma markers with potential value in the early diagnosis of CPB resulted complications.Methods 10 adult male SD rats were divided into the experiment group and the con-trol group randomly (n=5),and took food and water freely before operation.The rat models of CPB were constructed in the experi-ment group.But no any CPB operation was administered in the control group in addition to anesthesia induction,arterial and venous puncture procedure.1 mL of blood sample was extracted for separating plasma before CPB and at the end of CPB in the two groups. The total plasma protein was purified.Then the 2-dimensional electrophoresis and the scanning imaging by ImageScanner were per-formed.The protein spots verified to be differential expression were performed the cutting,enzymolysis and peptide fragment ex-traction.Finally the mass spectrometer was adopted to conduct the analysis and identification.Results The number of visualized spots was increased significantly after CPB.17 protein spots with up-regulated expression were identified as differential expression caused by CPB.5 proteins were verified by mass spectrometer analysis and database research.They were gelsolin,haptoglobin,apo-lipoprotein A-1,immunoglobulin gamma-2b and Ba1-647 respectively.Conclusion CPB can cause the differential expression of plas-ma proteins in rat model.According to the function analysis,gelsolin,haptoglobin and apolipoprotein A-1 have the potentiality of be-ing the plasma markers for studying CPB complications.

Objective To evaluate the efficacy of i-scan endoscopy in detecting small colorectal precancerous lesions.Methods A total of 127 patients were randomized into 2 groups to underwent conventional colonoscopy and i-scan endoscopy respectively.The findings were compared with pathologic examinations.Results A total of 84 lesions were detected by conventional endoscopy in 64 patients,while 147 lesions were found in 63 patients with high resolution detection only,which was increased to 259 with i-scan,including 102 flat lesions.With respect to histology,adenomatous lesions could be predicted with a high sensitivity (80％) and a high specificity ( 100％ ) by i-scan endoscopy.Conclusion More small colorectal lesions can be detected by i-scan endoscopy,which can distinguish neoplasm from non-neoplasm colorectal lesions.

ObjectiveTo evaluate digital chrome endoscopy (I-Scan) and confocal laser endomicroscopy (CLE) for diagnosis of Barrett esophagus (BE).MethodsFrom July 2010 to July 2011,a total of 878 outpatients who had upper gastrointestinal symptoms underwent routine endoscopy and I-Scan examination,screened patients with suspected Barrett's epithelial were further referred to CLE and endoscopy.The detection rate and image features of BE between routine endoscopy and I-Scan,and the diagnosis of BE between pathology and CLE,were compared respectively.ResultsSuspected BE was diagnosed in 46 patients (5.2％) by routine endoscopy,and in52 (5.9％) by I-Scan,and there was no significant difference in detection rate between 2 methods (x2 =0.533,P ＞ 0.05 ).The detection rate of paliform blood vessels between SCJ and GEJ was higher using I-Scan (35/52,67.3％ ) than routine endoscope (21/46,45.7％,P ＜0.05).A total of 19 suspected BE underwent CLE and biopsy,and BE was diagnosed by CLE with a sensitivity of 93％ and a specificity of 100％.ConclusionI-Scan is capable of identifying paliform blood vessels between SCJ and GEJ,and can improve the detection rate of suspected BE.CLE is able to provide in-vivo histological diagnosis of BE with a high sensitivity and specificity.