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.

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.

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.

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.

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

Objective To explore on FK506 promoting proliferation of Schwann cells in vitro and NGF of Schwaun cells secreted highly by itself. Methods Purified Schwann cells divide into six groups:group A (control group) DMEM/F12 contained 10% calf bloodserum; group B contained 0.1 ng/ml FK506; group C contained 0.5 ng/ml FK506; group D contained FK506:1.0 ng/ml;group E contained FK506:5.0 ng/ml; group F contained FK506:10 ng/ml. Morphology of Schwann cells were oboyrved by invert microscope and evaluated Schwann cells in immunocytochemistry staining with anti-S-100. The best concentration of FK506 who promoted proliferation of Schwann cells by MTT. Cell cycle of Sehwarm cells were determined by flow cytometry. The level of NGF in the conditioned media was determined by an enzyme-linked immunoadsordcnt assay after 72 h. Results Group C was the best concentration which promoting proliferation of Schwann cells among 5 groups, when the concentration 1.0 ng/ml FKS06 to promote Schwann cell proliferation gradually weakened. Detected by flow cytometry showed that: containing 10% fetal DMEM/F12 bovine serum for 24 h,72 h and 48 h after Schwann cells in S phase percentage were 27.8%,39.3% and 58.4% in the 0.5 ng / ml FK506 for 24 h,72 h and 48 h after Schwann cells S percentage period were 54.2% ,60.3% and 94.6%. S phase of the latter than the former in 24 h,72 h and 48 h, respectively higher: 26.4% and 21% and 36.2%. FK506 detected by ELISA promote Schwann cell proliferation after the expression of NGF in the experimental study found: 0.5 ng/ml FK506 for 72 h after the Schwann cells secreted by the NGF as high as 0.188 ng/ml, rcspectiveIy. Conclusion FKS06 can promote proliferation of Schwann cells at early time in vitro and Schwann cells' good situation is highly kept to secrete NGF.

Objective To provide applied anatomic data for relevant operations of blood vessels of perisacral promontory(BVPSP). Methods The composition of BVPSP including origin, course, diameter of the middle sacral vessels, the distance between the sacral promontory and the sacral 1 transverse trunk were observed on 37 adult cadavers. Result The BVPSP is composed of the common and internal iliac vessels, the superior segment of the middle sacral vessels and the sacral 1 transverse trunk. Middle sacral artery comes from abdominal aorta. Middle sacral veins are thin walled without valves. The average diameter of middle sacral artery and vein is 1.02 mm and 2.53 mm respectively. The distance between the sacral 1 transverse trunk and the sacral promontory is 5.75 mm. Conclusion The composition of BVPSP, especially middle sacral veins, plentiful vascular anastomosis are the anatomical basis leading to massive hemorrhage in the relevant operations.