The clinical detection of paroxysmal atrial fibrillation(PAF)remains challenging due to its transient and stochastic characteristics,and existing dynamic mode decomposition methods have limitations in modal redundancy reduction and feature extraction when processing single-channel noisy electrocardiogram(ECG)signals.Therefore,a signal analysis method based on high-order dynamic mode decomposition is proposed.It captures high-order correlations within ECG signals through tensor decomposition techniques and decomposes complex signals into physically interpretable dynamic modes.A stability evaluation framework for signal subsystem is established based on modal interaction relationships.By incorporating quantitative indicators including proportion of modes reflecting system instability,modal distribution entropy,and eigenvalue spectrum divergence,a feature discrimination model for PAF is developed.Experimental validation using the MIT-BIH atrial fibrillation database reveals statistically significant differences(P<0.05)in stability-related features between PAF episodes and normal sinus rhythms.The classification model based on support vector machine achieves an average recognition accuracy of 96.15%.These results demonstrate that the proposed method can effectively analyze nonlinear dynamic characteristics in noisy single-lead ECG signals,thereby establishing a novel quantitative analytical framework for early detection and accurate diagnosis of PAF.

The clinical detection of paroxysmal atrial fibrillation(PAF)remains challenging due to its transient and stochastic characteristics,and existing dynamic mode decomposition methods have limitations in modal redundancy reduction and feature extraction when processing single-channel noisy electrocardiogram(ECG)signals.Therefore,a signal analysis method based on high-order dynamic mode decomposition is proposed.It captures high-order correlations within ECG signals through tensor decomposition techniques and decomposes complex signals into physically interpretable dynamic modes.A stability evaluation framework for signal subsystem is established based on modal interaction relationships.By incorporating quantitative indicators including proportion of modes reflecting system instability,modal distribution entropy,and eigenvalue spectrum divergence,a feature discrimination model for PAF is developed.Experimental validation using the MIT-BIH atrial fibrillation database reveals statistically significant differences(P<0.05)in stability-related features between PAF episodes and normal sinus rhythms.The classification model based on support vector machine achieves an average recognition accuracy of 96.15%.These results demonstrate that the proposed method can effectively analyze nonlinear dynamic characteristics in noisy single-lead ECG signals,thereby establishing a novel quantitative analytical framework for early detection and accurate diagnosis of PAF.

Objective To observe the value of habitat model based on lung CT for predicting brain metastasis(BM)of lung adenocarcinoma with epidermal growth factor receptor(EGFR)mutation.Methods Data of plain lung CT of 198 lung adenocarcinoma patients with EGFR-mutant were retrospectively analyzed.The patients were divided into training set(n=138)and test set(n=60)at the ratio of 7∶3,and further divided into BM subgroup and non-BM subgroup in each set.Then a logistic regression(LR)clinical model was constructed using variables being statistically different between subgroups in training set.For features extracted from tumor and subregion of tumor,radiomics models and habitat models were constructed based on random forest,Gaussian process(GP)and support vector machine(SVM)algorithms,and the best radiomics and habitat models with generalization ability were screened.LR combined model was constructed based on the predicted values of the best radiomics and habitat models with generalization ability,as well as the clinical model.Then receiver operating characteristic curves were drawn,and the area under the curves(AUC)were calculated to evaluate the efficacy of each model for predicting BM of lung adenocarcinoma with EGFR-mutant.Spearman correlation analysis was performed to observe the correlations between Ki-67 and habitat features of lung adenocarcinoma with EGFR-mutant.Results AUC of LR clinical model,GP radiomics model,SVM habitat model and LR combined model for predicting BM of lung adenocarcinoma with EGFR-mutant was 0.700,0.726,0.801 and 0.834 in training set,0.754,0.600,0.715 and 0.848 in test set,respectively.AUC of LR combined model was higher than that of LR clinical model in training set(P＜0.001),also higher than that of GP radiomics model in test set(P=0.010).Compared with GP radiomics model and SVM habitat model,the performance of LR combined model was significantly and positively improved in training set(integrated discrimination improvement index[IDI]=8.60%,8.55%,both P＜0.001).Ki-67 level of EGFR-mutant lung adenocarcinoma was lowly and positively correlated with habitatmap_original_glszm_lalgle extracted from habitat map(│rs│=0.201,P=0.004).Conclusion The habitat model based on lung CT could be used to predict BM of lung adenocarcinoma with EGFR-mutant effectively.

Objective To determine the diagnostic value of endoscopic ultrasound-guided fine needle aspiration ( EUS-FNA ) for gastrointestinal lesions with inconclusive endoscopic biopsies. Methods A retrospective analysis was performed in 65 patients who were found to have gastrointestinal lesions with inconclusive endoscopic biopsies and underwent EUS-FNA in Drum Tower Hospital. Diagnostic value of EUS-FNA was determined by comparing with surgical histopathology and follow-up results. Results This study included 41 males ( 63％) and 24 females ( 37％) with median age of 60 years. The most common lesion was diffuse infiltrative lesions ( 37, 56. 9％) , followed by submucosal protrusion types ( 17, 26. 2％) . Fifty-four cases ( 83. 1％) were malignant lesions, and 11 cases ( 16. 9％) were benign. The overall sensitivity, specificity, and accuracy of EUS-FNA for gastrointestinal lesions with inconclusive biopsies were 76. 8％ ( 95％CI: 65. 7％-87. 8％) , 100. 0％ ( 95％CI: 66. 4％-100. 0％) , and 80. 0％( 95％CI: 70. 3％-89. 7％) , respectively. Sub-group analysis showed the sensitivity, specificity, and accuracy of EUS-FNA for diffuse infiltrative lesions were 70. 6％ ( 95％CI: 55. 3％-85. 9％, 100. 0％( 95％CI:29. 2％-100. 0％) , and 73. 0％ ( 95％CI: 58. 7％-87. 3％) , respectively. For submucosal protrusions, the sensitivity, specificity, and accuracy of EUS-FNA were 68. 8％ ( 95％CI: 46. 0％ -91. 5％) , 100. 0％ ( 95％CI: 2. 5％-100. 0％) , and 70. 6％ ( 95％CI: 44. 0％-89. 7％) , respectively. Conclusion EUS-FNA has moderate diagnostic value for endoscopic biopsy-inconclusive gastrointestinal lesions. It can be an alternative option when standard methods, such as endoscopic mucosal forceps biopsy, fail to provide a definitive diagnosis.

Objective To evaluate the efficacy and security of splenic artery ligation for severe hypersplenism during liver transplantation.Method Thirty-two liver transplant patients with preoperative hypersplenism were selected,including 17 cases (ligation group) treated by splenic artery ligation during liver transplantation,and rest 15 patients as non-ligation group.The fluctuation of white blood cells,platelets and volume of spleen were compared between these two groups.At the same time,splenic infarction,postoperative infection,recurrent gastrointestinal bleeding,splenic artery steal syndrome and other complications were observed in these two groups.Result All recipients were followed up for over 6 months.One recipient in ligation group died of multiple organ dysfunction caused by delayed recovery of liver donor with the survival rate being 94.1％ (16/17).The survival rate in non-ligation group was 93.3 ％ (14/15) (one recipient died of respiratory failure caused by pulmonary infection).There was no statistically significant difference in survival rate between these two groups (P＞0.05).Splenic necrosis wasn't detected in the ligation group.The splenic volume in ligation group was significantly less than that in non-ligation group (P＜0.01).The products of splenic maximum length and wide diameter shrunk 33.17-± 8.26 cm2 and 22.47 ± 7.25 cm2 in ligation group and non-ligation group,respectively.The platelet counts of ligation group were significantly greater than those of non-ligation group in all the observation points within 6 postoperative months (P＜0.01).The white blood cell counts of ligation group were greater than those of non-ligation group at the first week postoperatively (P＜0.01),whereas,there was no statistically significant difference between these two groups from then on (P＞0.05).The infection incidence of ligation group was lower than that of non-ligation group within 6 postoperative months (P ＜0.05).Statistically significant differences in recurrent gastrointestinal bleeding and splenic artery steal syndrome weren't found between these two groups (P＞0.05).Conclusion Splenic artery ligation in liver transplantation is safe and effective.It can rapidly increase the counts of platelet and white blood cell in the earlier postoperative time,which is beneficial to patient's recovery.Besides,it adds no correlative complication.

Objective:To explore the calvarial critical size defect (CSD)in rats with type 2 diabetes mellitus(T2DM).Methods:T2DM model of SD rats(weighted 300-320 g)was induced by high fat and high sugar diet and low dose intraperitoneal streptozotocin (STZ)injection.The rats with T2DMand the normal controls were divided into 4 groups(n=3)respectively.Defects with the diame-ter(mm)of 2,3,4 and 5 were made on the central calvaria of each rat.General observation,X-ray examination and histological study were performed 8 weeks postoperatively.Results:In the T2DM group,only the defects of 2 mm diameter were healed completely,X-ray resistance and new bone formation were observed;the defects of 3,4 and 5 mm diameter were unhealed,X-ray transmission was observed and newly formed bone was insufficient.In the control group,the defects of 2,3 and 4 mm diameter were healed completely, X-ray resistance and new bone formation were observed;the defects of 5 mm diameter were unhealed,X-ray transmission was ob-served,newly formed bone was insufficient.Conclusion:The calvarial CSD of T2DM rat model can be defined as the defect with the diameter of 3 mm.

Objective To explore the efficacy and safety of thymalfasin in the treatment of severe pulmonary infection after liver transplantation.Methods Twenty seven patients who developed severe lung infection after undergoing liver transplantation in Organ Transplant Institute of the 309 th Hospital of People’s Liberation Army from January 2008 to May 2014 were enrolled in this study.According to whether the application of thymalfasin,the patients were divide into thymalfasin group (n =11)and control group (n =16).In the thymalfasin group,thymalfasin was administered via subcutaneous injection at a dose of 1.6 mg once daily for consecutive two weeks.In the control group,conventional anti-infection therapy was delivered. Ventilator time,duration of fever,the length of intensive care unit (ICU)stay and mortality were statistically compared between two groups.And the incidence of acute rejection (AR)was monitored.Results Ventilator time,duration of fever,length of ICU stay of patients in the thymalfasin group were significantly shortened compared with those in the control group (all in P <0.05).There was no significant difference in the mortality between two groups.No clinical AR was observed in either group.No thymalfasin-related adverse event was found in the thymalfasin group.Conclusions Thymalfasin can improve the curative effect to anti-infection of patients with severe pulmonary infection after liver transplantation without the incidence of AR,which is efficacious and safe in the treatment of severe pulmonary infection.

BACKGROUND:Previous studies have reported the cause and treatment of biliary complication. However, how to improve operative technique for preventing the complication is rarely reported.
OBJECTIVE:To explore the effect of operational skil s during liver transplantation on biliary complications.
METHODS:Biliary complications in 475 patients who underwent liver transplantation were retrospectively analyzed. The relationship between operational skil s and biliary complications after liver transplantation was observed. The potential risk factors about operative technique were summarized. Some preventive interventions for biliary complications were suggested.
RESULTS AND CONCLUSION:Biliary complication was diagnosed in 36 (7.6%) of 475 patients who underwent liver transplantation. They were nonanastomotic biliary stricture (n=19, 4.0%), anastomotic biliary stricture (n=7, 1.5%), biliary leakage (n=3, 0.6%), twisted common biliary duct (n=3, 0.6%), residual common duct stone (n=1, 0.2%), and neoformative common duct stone (n=3, 0.6%). There was no difference in the incidence of nonanastomotic biliary stricture among the three biliary anastomotic styles. The possibility of anastomotic biliary stricture in placing T-drainage tube group was lower than the other two groups according to clinical data. Nevertheless, there was no statistical difference between these three groups. Infusing UW into the liver from cranial mesenteric vein and douching the biliary duct immediately while taking the donor could decrease the incidence of biliary complication after liver transplantation (P=0.013 and P=0.018, OR=0.26 and OR=0.28), the later factor could also decrease the incidence of nonanastomotic biliary stricture (P=0.001, OR=0.09). Meanwhile, some operational skil s also decrease the incidence of biliary complications, such as protecting the artery around the biliary duct, and elevating the liver when suturing the common biliary duct.

BACKGROUND:With the improvement of in vitro fertilization-embryo transfer technology, patients with in vitro fertilization-embryo transfer are facing more and more psychological stress. To completely understand their mental features and to explore effective mental intervention are important problems faced workers of reproductive medicine.
OBJECTIVE:To investigate the psychological condition of in vitro fertilization-embryo transfer patients.
METHODS:A total of 92 in vitro fertilization-embryo transfer patients, who entered the cycle from October to
November 2012, were enrol ed in this study. The psychological conditions of these patients were evaluated using Symptom Checklist-90.
RESULTS AND CONCLUSION:Al the factor scores of the Symptom Checklist-90 in patients with in vitro fertilization-embryo transfer achieved significantly higher levels than national adult norm on their first day of in vitro fertilization-embryo transfer cycles (P<0.05), with the exception of Psychiatric state factor. Meanwhile, in addition to Psychiatric state, differences of al the factors of Symptom Checklist-90 in patients with in vitro fertilization-embryo transfer were statistical y significant in different stages of in vitro fertilization-embryo transfer cycles at the first day of entering cycle, the day of obtaining ovum, and the seventh day of embryo transfer, (P<0.05). Interpersonal relationship, Depression and Anxiety scores were increased at the first day of entering cycle, the day of obtaining ovum, and the seventh day of embryo transfer (P<0.05). These results showed that patients with in vitro fertilization-embryo transfer tend to have poor psychological status, which is a problem in patients during the different stages of in vitro fertilization-embryo transfer cycles and becomes aggravated during egg retrieval and waiting for the outcome. Interventional measures should be taken in different stages to improve patients’ mental health.

Objective:To evaluate the outcome of implant-supported all-ceramic fixed partial prostheses (FPPs)in posterior area. Methods:The clinical data of 1 20 implants-supported 53 fixed dentures in 47 patients were collected from July 201 1 to June 201 2 and prospectively studied.Complication and failure of implants and /or prosthesis,biological and technical complications were evaluated. Results:43 restorations with 1 00 implants in 37 cases were followed up for 1 2 -24 months.Veneering ceramic chipping was observed in 9(20.9%)prostheses.Inflamed marginal gingivitis was found around 3(7.0%)prostheses.No implant was involved in technical complication.Cumulative survival rate was 1 00% for implant-based analysis and 1 00% for prostheses-based analysis.Conclusion:Implant-supported all-ceramic fixed partial dentures may be a feasible treatment modality for posterior dental restoration.