Objective: To evaluate the biocompatibility of self made nitinol alloy ventricular septal defect occluder. Methods: Six nitinol alloy ventricular septal defect occluder were implanted in the ventricular septum by catheter in 6 normal anaesthetized open chest pigs, and the animals were observed for 45 to 120 d(2 animals). Results: One deaths resulted from hemorrhage and another from embolization of occluder in abdominal aorta during the placement procedure. Successful placement of the occluder was achieved in 4 animals. Four animals were killed at 45, 60 and 120 d. Postmortem gross and microscopic examination of 4 devices 45 to 120 d after placement showed that both the right and left ventricular discs of the occluder were completely covered by a smooth, shiny, glistening thin layer of neoendocardium, and the surface of neoendocardium was covered by a monolayer of endothelium like cells. The inflammatory infiltrate around the occluder was found at 45 d, and disappeared and fibrosis formed at 120 d. These appeared as a repair process of the injury. Embolization in lung,liver, spleen, kidney, intestinal and colon were not found. Conclusion: These suggest that the self made nitinol alloy ventricular septal defect occluder has good biocompatibility. [

Objective To observe the anatomical features of muscular branches of radial nerve in the forearm. Methods Forty seven adult embalmed cadaver arms were dissected under 4? loupe magnification. The radial nerve was identified in the interval between the brachioradialis and brachialis at the upper arm 10 cm proximal to the lateral humeral epicondyle (LHE). The nerve and branches were dissected and observed. The number of branches entering the muscles was counted and the following measurements were performed along the radial nerve and branches with a vernier caliper (accurate to 0.1 mm): distances from the origin point and muscle entry point of each branch to the LHE, the distance between the LHE and the styloid process of ulna (SPU). Data were pooled among all specimens (n=47) to calculate mean and standard deviation. Results In 35 of 47 (74.5%) specimens, the deep branch of the radial nerve coursed along the line between the LHE and the SPU. In all specimens, extensor indicis was the last muscle to be innervated. The average distance from the LHE to the origin point of extensor indicis branch was (160.6?12.1) mm, and that from the LHE to the SPU was (231.7?14.6) mm. The average proportionality between these two distances was 0.7?0.1. There was a large variation in branch number. The muscle with the highest branch number (4.6 averaged) was the extensor digitorum communis and that with the lowest number (1.1 averaged) were extensor policis longus and extensor indicis proprius. In 29 of 47 (61.7%), extensor carpi radialis brevis (ECRB) branch originated from the superficial branch of the radial nerve. In 15 of 47 (31.9%), the branch came from the deep branch of the radial nerve. In 3 of 47 (6.4%), the branch emanated from the radial nerve as 1 branch of a trifurcation (with the other branches being the deep branch and the superficial branch of the radial nerve). Conclusion With the forearm being pronated, the proximal 7/10 of the line between the LHE and the SPU can be considered as the projection on body surface of the deep branch of the radial nerve. The deep branch of the radial nerve may be damaged by operators improper dragging and detaching in surgery with the following reasons: branch lengths of extensor digitorum, extensor carpi ulnaris and extensor digiti minimi are short relatively, and origin points of these branches are more close than others to the point through which the deep branch of the radial nerve come out supinator. Differences in muscle architecture and function may be the reason that there is such variation in branch number. Discrepancies between studies about the ECRB branch origin may be related with the fault committed by researchers in dissecting.

Objective To develope a new method producing ventricular septal defect (VSD) model by transcatheter puncture and evaluate its feasibility and practicability. Methods Ten dogs underwent transcatheter ventricular septal puncture with Brockenbrough puncture needle via right jungular vein under fluoroscopy, and then dilated the defect with 6-8mm balloon catheter. Left ventricular (LV) angiography was performed with pigtail catheter by transaortic access after puncture. Right after the procedure and 1-4 months later, the dogs were sacrificed and the defects were inspected. Results VSDs were successfully made in 8 dogs, which were demonstrated by LV angiography with one defect at membranous part. The defects in other dogs were shown near membranous septum or muscular septum not far away from the membranous part. The distance from aortic valves to the rims of defect was 4-16mm, from tricuspid valves 4-10mm. Ⅲ?AVB was found in 1 dog which died 1 week later, with ruptured membranous part at autopsy. CRBBB was found in another dog. Conclusion Establishment of VSD animal by transcatheter puncture is feasible, practicable and of high successful rate and less complication.

Objective To explore the novel method to establish animal model of controllable sized atrial septal defect. Methods Fourteen dogs of both sexes were selected,with weight ranging from 15 to 20kg. Under guidance of fluoroscopy,ASD was established by using Brokenbrough needle and balloon dilatation. Results Tow dogs died of cardiac tamponade.Other twelve dogs had ASD created successfully without complication. Conclusion The method has the advantages of easy manipulation , size controllable and small amount of fluoroscopy exposure.

Objective To evaluate the methods of electrophysiological study (EPS) and radiofrequency catheter ablation (RFCA) for atrial tachycardia (AT) and the efficacy of RFCA. Methods Thirty-nine patients with AT were selected to undergo EPS and RFCA. The mean illness course was (4.5?1.6) years. Two patients had atrial septal defect, one had coronary artery disease, one dermatomyositis, and the other 35 patients had no structural heart disease. Identification of the earliest endocardial atrial activity (EAA) was based on the activation mapping recorded during AT. Results AT was induced spontaneously by atrial premature beats in 3 patients, and all other AT was inducible by atrial stimulation. Nine patients had other types of tachycardia combining with AT (including 5 patients with atrioventricular nodal reentrant tachycardia, 2 with atrial flutter and 2 accessory pathway). The site of AT was located by recording the EAA during AT and the region of successful FRCA. In 33 patients of successful ablation, the sites of AT were 9 near coronary sinus orifice, 5 near His bundle, 13 in right atrial lateral wall along crista terminalis, 2 in superior vena cava, 3 in atrial septum and 1 in right pulmonary vein. The successful rate was 81% (33/39) with all success of 9 other tachycardia. The mean fluoroscopic time was (16.4?2.1) minutes. None of patients had complications during and after ablation. Conclusions RFCA is an effective and safe treatment for AT. The activation mapping is the most effective method. Atrial septum and crista terminalis are the most common sites of AT.

Intra-atrial re-entrant tachycardias (IARTs) are common late after heart surgery. Conventional mapping and ablation is relatively difficult because of the complicated anatomy and multiple potential re-entry loops. In this study we aimed to evaluate the electrophysiological characteristics and radiofrequency catheter ablation of atrial tachycardia (AT) induced by myocardial scar or incision. Methods In 6 patients (three male and three female, aged 33.3+ 11.8 years) who had AT related to myocardial scar or incision,electrophysiological study and radiofrequency catheter ablation (RFCA) were performed. Earliest activation combined with entrainment mapping was adopted to determine a critical isthmus. Results Re-entry related to the lateral atriotomy scar was inducible in 5 of6 patients. With entrainment mapping, the PPI (post-pacing interval)-TCL (tachycardia cycle length) difference was ＜30 ms when pacing at the inferior margins of the right lateral atriotomy scar. Among them, 3 patients had successful linear ablation between scar area to inferior vena cava, and 2 patients between scar area to tricuspid annulus. Re-entry involving an ASD patch was demonstrated in 1 of 6 patients. PPI-TCL differences ＜30 ms were observed when entraining tachycardia at sites near the septal patch. But linear ablation failed in terminating AT. There was no complication during procedure. No recurrence of AT related to incision was observed during follow-up except for the failed patient. Conclusion Under conventional electrophysiological mapping, adopting linear ablation from scar area to anatomic barrier, successful ablation can be obtained in patients with IRATs related to myocardial scar or incision.

ObjectiveTo investigate the molecular mechanism of prostaglandins E2 ( PGE2 ) in promoting bone formation by detecting the changes of gene expression profiles of MC3T3-E1 osteoblasts treated with PGE2. MethodsThe genes with differential expression in MC3T3-E1 osteoblasts treated with 10 μmol/L PGE2 for 30 minutes were performed by gene chip technology. Several major genes during bone regeneration were selected for Western blot analysis. ResultsAfter co-culture of MC3T3-E1 cells with PGE2 at concentration of 10 μmol/L for 30 min, 276 genes were up-regulated, including bone regeneration related MMD (monocyte to macrophage differentiation associated), NR4A2 (nuclear receptor subfamily 4, group A, member 2), BMP-7 ( bone morphogenetic protein-7), POSTN ( periostin, osteoblast specific factor) and catenin (cadherin-associated protein) genes; and 168 genes were down-regulated,including bone regeneration related Idl ,2,3 ( inhibitor of DNA binding 1,2,3 ) genes. Western blot analysis indicated that the expressions of nuclear factor (NF)-κB p65 and BMP-7 protein in the osteoblasts treated with 10 μmol/l PGE2 were apparently higher ( P ＜ 0. Ol ) than that of the controls, whereas the ld2 expression decreased (P ＜0. O1 ) under the same conditions, which was almost the same as the results of gene chip technology. ConclusionsWith the results of gene chip and Western blot, it can be speculated that the PGE 2 firstly activates the nuclear receptor NR4A2 and then the nuclear transcription factor NF-κB, induces the changes of the downstream gene BMP-7 and Id2 expression and finally results in the differentiation of the osteoblasts and promote the bone regeneration.

Human enterovirus 71 (EV71) is one of the major etiological agents for the hand, foot, and month disease (HFMD) and is causing frequent, widespread occurrence in the mainland of China. The single positive-stranded RNA genome of EV71 is translated into a single polyprotein which is autocleavaged into structural and nonstructural proteins. The functions of many nonstructural proteins characterized in the life cycle of virus are potential targets for blocking viral replication. This article reviews the studies of the structures and functions of nonstructural proteins of EV71 and the anti-enterovirus 71 drugs targeting on these nonstructural proteins.

Objective To investigate the effect of Lactobacillus plantarum(LP)on intestinal flora and bacterial translocation in mice with spontaneous inflammatory bowel disease(IBD). Methods Interleukin 10 knockout mice(IL-10~(-/-))were used as models of IBD.Eight-week old female mice were randomized to control group, IL-10~(-/-)group and IL-10~(-/-)+LP group.IL-10~(-/-)+LP group received 0.5 mL LP(1.0×10~9CFU/mL)per day for 4 weeks,and the other groups received 0.5 mL Ringer buffer.Intestinal flora including Bifidobacteria,Lactobacilli,Enterobacteriaceae and Clostridium perfringens in the feces and bacterial translocation in mesenteric lymph nodes and spleens were detected. Results The contents of Bifidobacteria and Lactobacilli significantly decreased in the intestine of IL-10~(-/-)mice,while those of Enterobacteriaceae and Clostridium perfringens significantly increased,and the bacterial translocation significantly increased.Four weeks after LP treatment, the disturbed intestinal flora was restored, and the bacterial translocation decreased. Conclusion LP administration can modulate the imbalance of intestinal flora and decrease the bacterial translocation,thus enhance intestinal barrier function in mice with IBD.

AIM: To investigate the effects of internal change of serum insulin and plasma glucose levels on serum free fatty acid (FFA) concentrations after glucose loading. METHODS: Serum insulin, plasma glucose and FFA concentrations were measured simultaneously in 234 essential hypertension patients who were undergoing oral glucose tolerance test (OGTT) [ including 20 cases with 2 type diabetes mellitus (DM), 74 impaired glucose tolerance (IGT), 140 normal glucose tolerance (NGT); 98 males, 136 females]. RESULTS: Fasting serum FFA concentration (?mol/L) in DM ((1 048.47)?481.6) was higher than that in IGT (760.1?332.1) (P