Objective To discuss the exposing methods of recurrent laryngeal nerve(RLN)in thyroid surgery for reducing the nerve injury.Methods We analyzed 267 cases with thyroid tumors retrospectively.In all the cases,RLN were anatomically exposed.Results Of all the cases the injury rate of RLN was,0.38%.Conclusion The anatomic relation of RLN is relatively complicated along its journey;the injury of RLN can be reduced with designed exposal during the thyroid surgery.

Objective:When troops take actual combat training in plateau cold field environment, the wounded condition is complicated. The application of remote classification system can improve the efficiency of salvage of patients and reduce the incidence of accidents.Methods: By using front-end transmitting equipment, network equipment and high integration module, on-site real-time acquisition of video, audio and data information can be transmitted to the clinic with high quality by wireless digital way.Results: The rescue efficiency of critical patients and the inspection injury classification efficiency of sick and wounded improved obviously. The medical service support capability of cold plateau area improves significantly.Conclusion: the use of remote classification system will be classified triage work forward, gold for critical seriously injured patient treatment time, greatly improving the rescue success rate of critically ill patients.

Objective To explore the changes and the significance of left ventricular functions after blunt chest trauma(BCT)in rabbits.Methods 36 rabbit models of BCT with BIM-Ⅱ Bio-impactor in were used to observe the changes of left ventricular functions and free calcium,free calmodulin and total calmodulin were detected at pre-injury,the 2nd,4th,8th,12th and 24th hour after injury.Results The cardiac function were impaired.The systolic functions of left ventricle were impaired and recovered during 4-12 hour after BCT.The diastolic functions of left ventricle were impaired but not recovered 24h after BCT.The free calcium and total calmodulin in myocardial cells were increased from the 4th hour,reached,peak at the 8th hour post-BCT(P＜0.01),and then decreased,but were still higher at the 24th hour post-BCT than that of pre-BCT(P＜0.05).The free calmodulin in myocardial cells was low and reached peak at the 8th hour after BCT(P＜0.01).There is remarkable positive correlation between free calcium in myocardial cells and LVEDP and dp/dtmax with cardiac function(P＜0.05,P＜0.01).Conclusion The cardiac function is obviously changed after BCT,especially the diastolic functions of left ventricle.The hish concentration of free calcium in myocardial ceils may be one of the reasons of cardiac dysfunction after BCT.

Objective To evaluate the rate of residual tumor after local resection of thyroid carcinoma,and provide theoretical basis to determine the indications for re-operation.Methods The clinical data of 56 patients,who had re-operation in our hospital after local resection of thyroid carcinoma,were summarized.Results As confirmed by pathology,the rate of residual tumor of patients was 42.8% at re-operation.When the tumor was larger than 4 cm,or smaller than 2 cm before the first operation,the residual tumor rate was 80% and 11.1% respectively.The residual tumor rate was 86.3% in patients with tumor invading thyroid capsule,14.7% in patients without capsule invasion,47.6% in patients who had only nodule resection,50% after ipsi-lateral partial lobectomy,and 12.5% after subtotal thyroidectomy.The sensitivity of finding residual tumor by CT and doppler ultrasound examiination before re-operation was 64.0% and 60.0% respectively,and the positive predictive value was 80.0% and 30.0% respectively.Conclusions The rate of residual tumor is high in patients with thyroid cancer operated by local resection.And it′s necessary to re-operation.The condition of tumor before the first operation and CT examination are significant for selection of patients to have re-operation.

Objective To explore the changed rules and the diagnositic methods of the cardisc functions after chest impact trauma(CIT).Methods The medals of moderate to severity CIT were established using BIM-Ⅱ Bio-impactor in 20 rabbits.The cardiac functions were examined with cardiac catheterization,single photon-emission computed tomography(SPECT)and the Doppler echocardiography at pre end post 1h,4h,8h and 24h after CIT.Results The cardiac functions were changed significantly after CIT.The expressions of the right ventricular dysfunctions mainly were systolic dysfuction while the left ventricular dysfunctions mainly were diastolic dysfunction after CIT.Conclustion All the cardiac catheterization、SPECT and the Doppler echocardiography are beneficial to the diagnosis of cardiac dysfunction afte CIT.The SPEGT is more exactitude and the Doppler echocardiography is more cheaper compared with non-invasive approaches.

Objective To study the mutations of Pseudomonas aeruginosa oprD gene in Imipenem-resistant clinical isolates. Methods Random amplified polymorphic DNA typing(RAPD) was carried out to analyse the homology in 10 Imipenem-resistant clinical isolates. Pseudomonas aeruginosa oprD gene in 10 Imipenem-resistant clinical isolates were amplified by polymerase chain reaction and sequenced. Results Ten Imipenem-resistant clinical isolates were divided into four different clones which can not produce metallo ?-lactamase. As compared with sequence X63152, oprD gene of Pseudomonas aeruginosa varied greatly. The aberration rates exceed 50%. There were multiple point mutations within 276～387 bp coding region of 30, 11, 9, 20, 31 strains. Due to the mutations of 308 bp G→C and 344 bp C→A, threonine and diaminocaproic acid were replaced by serine and threonine respectively. The DNA deletion of 393～412 bp in oprD gene contributes to the frame shift mutation in the following nucleotide sequence. The deletion of 264～273 bp in the coding region of oprD gene in 13 and 21 clone strains leads to frame shift mutations forming terminal codon TAA(319～321 bp).Base substitutions and multiple point mutations were obvious in the coding regions of 1 and 22 clone strains. Their aberration rates were 54.03% and 74.89% respectively. Conclusions The mutations of Pseudomonas aeruginosa oprD gene in Imipenem-resistant clinical isolates are various.

Background and purpose: DNA methylation is an important mechanism for regulating gene expression, and plays an important role in the tumorigenesis. Study shows that DNA methylation is a potentially promising biomarker in tumor diagnosis, prognosis as well as treatment selection. This study aimed to analyze the methylation status and assessed possible clinical value of 3 DNA repair genes BRCA1, GSTP1 and MGMT in breast cancer samples of Chinese women. Methods:Using methylation speciifc PCR (MSP), we analyzed the methylation status of 3 DNA repair genes BRCA1, GSTP1 and MGMT in 106 paired breast tumors and corresponding normal tissues. Results: The methylation rates of BRCA1, GSTP1 and MGMT were 24.5% (26/106), 29.2% (31/106) and 18.9%(20/106) in breast cancer tissues, which were higher than those (7.5%, 11.3%and 4.7%) in paired normal breast tissues, respectively (P<0.01). Methylation in at least one of the genes was found in 50.9%(54/106) of the breast cancer and 19.8%(21/106) in paired normal breast tissues. And the mean number of genes hypermethylated in each tumor and paired normal breast tissues were 0.73 and 0.24, respectively (P<0.000 1). The methylation status of BRCA1 was more frequent in the younger patients than in the older patients (P=0.007) and most BRCA1 methylated patients were ER negative (P=0.020). Methylation status of GSTP1 was signiifcantly correlated with tumor size, lymph node metastasis (P=0.028 and 0.033, respectively). MGMT methylation was significantly correlated with tumor stage, higher tumor grade and lymph node metastasis (P=0.016, 0.025 and 0.030, respectively). High frequency simultaneous methylation of these 3 genes was more often in those with higher tumor stage and lymph node metastasis (P=0.028 and 0.007, respectively). Conclusion:Hypermethylation of BRCA1, GSTP1 and MGMT genes may be linked to various known clinicopathological features of breast cancer in Chinese women, and the increasing multiple gene methylation in tumors may indicate an aggressive phenotype for breast cancer. Detection of the methylation status of these genes may be useful for identifying patients at high risk for breast cancer.

Objective:To study the methods of protecting recurrent laryngeal nerve(RLN) in endoscopic thyroidectomy through the upper part of sternum.Methods:The clinilical data of 46 cases underwent endoscopic thyroidectomy through the upper part of sternum was analyzed.RLN was revealed when we performed nodulectomy or partial thyroidectomy.But during subtotal and near-total thyroidectomy the RLN was always revealed.Results:Forty-five of forty-six cases were compeleted successfully with endoscopic thyroidectomy.One case was converted to open thyroidectomy because of thyroid carcinoma.No intraoperative or postoperative hemorrhage,RLN injuried and deadlimb occurred.Conclusion:In order to reduce the injury of RLN,we should select the fitting cases strictly,master the opportunity and methods of revealed RLN.

Objective To detect biofilm formation and biofilm-associated genes of methicillin-resistant Staphylococcus aureus (MRSA) in clinical isolates. Methods The biofilm were determined by microtiter plate assay (MPA) and congo red agar (CRA) and the biofilm-associated genes icaA,sarA,fnbA,fnbB were detected by PCR in 33 strains of MRSA in clinical isolates. Results Of the 33 MRSA isolates, 29(87.9%) were MPA positive, 16(48.5%) were CRA positive; The icaA gene was present in 39.4% of isolated strains. Furthermore, 69.7% of strains harboured the sarA gene, 39.4% were fnbA positive and 75.8% were fnbB positive. As many as 87.9% strains had the ability to form biofilm in vitro. 44.8% of MRSA formed biofilm in ica-dependent mechanism and 55.2% of MRSA isolates formed biofilm in ica-independent mechanism. Of the biofilm positive MRSA, 75.9% were sarA positive, 37.9% were fnbA positive and 79.3% were fnbB positive. Conclusion Most of the MRSA strains formed biofilm in ica-independent mechanism. fnbB and sarA gene shows higher frequency among the biofilm-associated genes of MRSA, it may infer that most of the MRSA strains biofilm formation are fnbB-mediated. Meanwhile, sarA may be a positive regulator of fnbB, and thus drives the biofilm formation.

OBJECTIVE To study the antimicrobial susceptibility and molecular epidemiology of imipenem-resistant Pseudomonas aeruginosa isolated from patients in burn wards in a hospital of Guangzhou. METHODS A total of 48 imipenem-resistant isolates were collected,antimicrobial susceptibility was tested by KirbyBauer disk diffusion method.Random amplified polymorphic DNA(RAPD) typing was carried out to analyze the homology. RESULTS All isolates were multiresistant,the orders of sensitivity rates of antibiotics were CIP,TOB,AMK,GEN,and FEP.Forty eight strains were classified into types A,B,C,and D based on RAPD pattern,types A and B were the most epidemic clones. CONCLUSIONS The prevalence of imipenemresistant P.aeruginosa in burn wards of the hospital is due to nosocomial infection.The prevalent strains are multiresistant.