Objective To observe the effects of stereotactic implanting depth electrode into the hippocampus on monitoring mesial temporal lobe epilepsy. Methods Thirteen patients with pharmacoresistant epilepsy were included in the present study.The epilcptogenic zone might be located in the hippocampus based on the symptoms and MRI data.Eight-contact depth electrode was implanted into the patients' hippocampus by stereotactic procedures to record the electroencephalogram(EEG).The duration of monitoring lasted for 24-72 hours or more,so as to be sure if the epileptogenic zone was located in the hippocampus,and to provide evidences for surgical resection of epileptic focus.Results Thirteen patients with mesial temporal lobe epilepsy underwent video electroencephalogram monitoring for 72 hours.Twentynine epileptic seizures in 7 patients were detected.Ictal EEG changes manifested as paroxysmal slow wave or spike and slow waves on the background.The epileptiform discharges started from some electrode points,and then propagated to others or the contralateral electrode. After 1-2 seconds of delay,high amplitude slow waves with the frequency of 3-4 Hz were observed on the ipsilateral scalp EEG. Clinical epileptic seizures were not detected in 6 patients during monitoring,depth electrode showed paroxysmal focal high amplitude slow wave or spike and sharp waves,scalp EEG did not find abnormality.Six of thirteen patients received surgical resection of epileptic foci,the outcome during follow-up of 3-8 months was satisfactory.Conclusions To record hippocampal EEG in patients with intractable epilepsy by stereotactic implanting depth electrode into the hippocampus might be a safe and reliable method.It might provide strong evidences for the diagnosis of patients with mesial temporal lobe epilepsy,and for the location of epilcptogenic zone.

The understanding of the biological behavior of breast cancer has deepened, hence, local treatments for breast cancer have changed from resection to minimally invasive surgery. For patients with early breast cancer, constructing a minimally invasive interven-tion with low systemic toxicity is a problem, especially for cases involving precancerous lesions. Intraductal therapy for breast cancer, which is performed by inserting reagents through breastfeeding openings using suitable carriers, is a promising, accurate, and minimal-ly invasive method for breast cancer prevention and treatment. The combination of intraductal therapy with new therapeutic strate-gies, such as targeted therapy, endocrine therapy, and immunotherapy, might improve the therapeutic effect. Moreover, the mecha-nisms of intraductal therapy for breast cancer incorporate nanotechnology, molecular imaging, and gene sequencing. Intraductal thera-py is based on clinical and pathologic characteristics of Chinese breast cancer patients, and such characteristics must be determined prior to clinical application. This article mainly discusses the research progress of breast intraductal intervention.

Metabonomics involves the unbiased quantitative and qualitative analysis of the complete set of metabolites present in cells, body fluids and tissues (the metabolome) based on modern analytic technique with high throughput, high sensitivity, and high resolution. Gas chromatography-mass spectrometry (GC-MS) is used to gain qualitative results of detected metabolites for biological samples as it provides superior distinguishability, detection sensitivity and integrated standard mass spectrometry library. In this article, the historic developments of GC-MS and its application in metabonomics in the past several years were reviewed. Firstly, the classification and the derivative methods of GC-MS were introduced. Subsequently, sample pretreatment process, qualitative and quantitative analysis and data analysis during detecting metabolites by GC-MS were introduced, then its application in microorganism, plant and disease diagnosis was systematically summarized. Finally, the problems in metabonomics study based on GC-MS and the research prospect in the future were discussed.
Gas Chromatography-Mass Spectrometry ; methods ; Metabolomics ; methods

BACKGROUND:Integrated Traditional Chinese and Western Medicine minimaly invasive treatment for halux valgus based on wrapped curtain method with “8”-shaped bandage and sub toe pad external fixation has been used for a long time in the clinic. This method abandons the internal implant fixationandexternal plaster fixation. After surgery, patients could take care of themselves. However, theactivity of the broken end may cause fracture nonunion, which once aroused scholars’ question. Recently, with the continuous improvement of foot biomechanics research, foot finite element model and applications become a reality.
OBJECTIVE:To evaluate thestability of osteotomy after the operation of wrapped curtain method with“8”-shaped bandage and sub toe pad external fixation on the basis of static finite element method.
METHODS:A young female volunteer with halux valgus was selected, whose body weight was 58 kg, and right foot halux abductor valgus angle was 24°; intermetatarsal angle was 13°; proximal articulator set angle was 7°; distal articulator set angle was 7°. CT was used to scan the right foot. ABAQUS software was applied to establish a finite element model of right foot halux valgus bone, and model of the first metatarsal neck minimaly invasive osteotomy was simulated based on wrapped curtain method with external fixation. Von Mises stress and displacement at the osteotomy endwere calculated.
RESULTS AND CONCLUSION:(1) The maximum stress was 0.067 MPa without external fixation, and the maximum stress was 1.258 MPa with the external fixation. Stress was mainly distributed in the outer edge of the osteotomy. (2) The maximum absolute displacement was 0.363 mm without external fixation, and the maximum absolute displacement was 0.716 mm with external fixation. The two largest displacements were both in the Z-axis direction. Statistical analysis confirmed that the four nodes absolute displacement and stress were significantly different (P< 0.01). (3) The maximum relative displacement was 0.101 mm. The maximum relative displacement was 0.046 mm with external fixation. The maximum relative displacement without external fixation was-0.102 mm and occurred in the Z-axis. The maximum relative displacement with external fixation was 0.110 mm and occurred in the Y-axis. (4) One-way analysis of variance confirmed that the four nodes relative displacements were not statisticaly significant in X-axisand Y-axis (P> 0.05). The four nodes relative displacements were statisticaly significant in Z-axis (P< 0.05). (5) These findings suggest that the external fixation based on wrapped curtain method after halux valgus surgery could effectively reduce osteotomy displacement. The moderate stress and elastic fixation are conducive to fracture healing.

OBJECTIVETo discuss the application of right-inferior-posterior "artery first" approach in laparoscopic pancreaticoduodenectomy.

METHODSClinical data of 17 patients who underwent laparoscopic pancreaticoduodenectomy through right-inferior-posterior "artery first" approach in our department from February 2014 to April 2015 were retrospectively analyzed. The operation began at the inferior flexure of duodenum. After entering the Toldt's space, the left renal vein (LRV) was revealed and the root of superior mesenteric artery (SMA) was exposed just above the LRV. SMA was dissected along its trunk till the horizontal part of duodenum.

RESULTSOf these 17 cases, adenocarcinoma of pancreatic head was observed in 5 cases, adenosquamous carcinoma in 2 cases, mucinous cycstic neoplasm in 1 case, adenocarcinoma of lower common bile duct in 4 cases, and duodenal papilla cancer in 5 cases. Fifteen cases were accomplished successfully with laparoscopy and 2 cases were converted to open approach. The average operating time was (320 ± 85) min and mean intraoperative blood loss was (305 ± 175) ml. The cutting margins were tumor negative in all the patients. The average number of harvested lymph node was 15.4 ± 6.5. Postoperative complication occurred in 5 cases. Two cases of bile leakage and 2 cases of pancreatic fistula were cured with conservative treatment. One case of delayed abdominal hemorrhage was resolved with reoperation.

CONCLUSIONRight-inferior-posterior "artery first" approach is safe and feasible in laparoscopic pancreaticoduodenectomy.

Adenocarcinoma ; Duodenal Neoplasms ; Duodenum ; Humans ; Laparoscopy ; Mesenteric Artery, Superior ; Operative Time ; Pancreas ; Pancreaticoduodenectomy ; Postoperative Complications ; Retrospective Studies

Objective To investigate the effect of reducing antipsychotic dose on clinical symptoms in patients with stable schizophrenia. Methods Seventy-five patients with stable schizophrenia taking olanzapine or risperidone were enrolled. Patients were randomly divided into dose reduction group (37 cases) and maintenance group (38 cases). The dose of the risperidone or olanzapine was gradually reduced by 50％ in the dose reduction group within six months whereas remained unchanged in the maintenance group. The Positive and Negative Symptom Scale (PANSS), Calgary Depression Scale (CDRS), Personal and Social Performance Scale (PSP), Insight and Treatment Attitude Questionnaire (ITAQ) and Extrapyramidal Side Effects Scale (RSESE) were assessed at baseline, 3 months, 6 months and 12 months. Results There were one and two cases dropped out due to the relapse in dose reduction group and in maintenance group, respectively. The recurrence rates were 2.7％ in dose reduction group and 5.3％ in maintenance group (P<0.05). The interaction effects of PANSS positive symptoms, negative symptoms and general pathological symptoms, ITAQ,RSESE, PSP were significant (P<0.05). The main effect of PANSS negative symptoms and PSP group was significant (P<0.05). Compared with the maintenance group, PANSS negative symptoms of the dose reduction group were significantly lower at 6 and 12 months (P<0.05). PSP scores were significantly higher in the dose reduction group than in maintenance group (P<0.05) at 3, 6 and 12 months. Conclusion Reducing the dose of risperidone or olanzapine slowly in patients with stable schizophrenia within six months reduces negative symptoms and adverse reaction, improves social function without increasing positive symptoms.

Objective: The aim of the current study is to compare the short-term clinical outcomes between Billroth-I reconstruction using an overlap method and delta-shaped anastomosis in totally laparoscopic distal gastrectomy (TLDG). Method: A retrospective cohort study was performed. The following inclusion criteria were applied: (1) Preoperative gastroscopy and CT confirmed that the tumor is located in the antrum of the stomach, and the biopsy suggested adenocarcinoma; (2) Chest, abdomen and pelvis enhanced CT showed no evidence of distant metastasis; (3) Preoperative gastric reconstruction CT or endoscopic ultrasonography suggested that the clinical stage of the tumor is stage I-III. (4) During the operation, the tumor position was confirmed to be located in the antrum of the stomach by nanocarbon injection or gastroscope; (5) Complete laparoscopic radical gastrectomy for distal gastrectomy, and the gastrointestinal reconstruction was performed by delta-shaped anastomosis or overlap anastomosis. And the following exclusion criteria were applied: (1) History of gastric surgery; (2) Patients who cannot tolerate laparoscopic surgery because of comorbidities. Finally, data on 43 consecutive patients who underwent TLDG with Billroth-I reconstruction between January 2016 and November 2018 in Peking Union Medical College Hospital were retrospectively reviewed. Patients were divided into those who underwent Billroth-I reconstruction using an overlap method (n=20) or using delta-shaped anastomosis (n=23). The demographic and clinical characteristics and perioperative data of the two groups were analyzed. Measurement data that conformed to the normal distribution were expressed as the mean ± s, and differences between groups were compared using Student′s t-test; comparisons between the counting data groups were performed using the χ² test or the continuously corrected χ² test. Results: The demographic and clinical characteristics were similar between the delta-shaped group and the overlap group (P>0.05). There was no significant difference between groups regarding operation time [(185.9±22.8) minutes vs. (184.0±25.8) minutes, t=0.260, P=0.796], blood loss [(50.9±36.0) ml vs. (47.0±30.8) ml, t=0.375, P=0.709], number of stapler reloads used for anastomosis (5.1±0.3 vs. 5.2±0.6, t=-0.465, P=0.651), time to flatus [(3.3±0.9) days vs. (3.6±0.9) days, t=-1.067, P=0.292) and postoperative hospitalization [(8.8±3.1) days vs. (10.4±3.8) days,t=-1.494, P=0.143]. As for the delta-shaped group and the overlap group, the anastomotic leakage rate was 4.3% (1/23) and 0 (χ²=0.000, P=1.000), respectively. The incidence of anastomotic bleeding was 4.3% (1/23) and 5.0% (1/20) (χ²=0.000, P=1.000), while the incidence of intra-abdominal hemorrhage was 4.3% (1/23) and 0 (χ²=0.000, P=1.000). The incidence of gastric emptying disorders was 4.3% (1/23) and 30.0% (6/20), respectively (χ²=3.454, P=0.063). All complications were cured after conservative treatment or symptomatic treatment. Conclusion The overlap method for Billroth-I reconstruction is safe and feasible.

Objective To study the applicability and optimization of computer simulation methods during the allocation of health care providers for medical evacuation on board medical trains.Methods Using Anylogic as a simulation modeling tool,the process of mass evacuation of the injured by means of medical trains was simulated.The simulated process of rescue involved the generation,categorization,treatment and surgery of the injured individuals.The allocation of health care resources was assessed based on the different rates at which the injured arrived.Results In the carriage for mild to moderate patients,24 doctors and 36 nurses could meet the need of treatment.In the carriage for critically ill ones,4 doctors and 6 nurses could meet the need when the rate at which the injured arrived was 100-200 people/an hour.When the injured arrived at the rate of 300-476 people/an hour,4 doctors and 8 nurses were needed.Conclusion Computer simulation can be feasibly used to study the allocation of human resources for health care,which can facilitate decision-making about mass evacuation of injured personnel by means of medical trains.

OBJECTIVETo compare the difference of intra-abdominal infection between intracorporeal anastomosis (IA) and extracorporeal anastomosis (EA) in patients undergoing laparoscopic right hemicolectomy within postoperative 30 days.

METHODSClinical date of right colon cancer patients undergoing laparoscopic right hemicolectomy at the Department of Colorectal Surgery, PUMCH from January 1st, 2013 to October 31st, 2016 were retrospectively analyzed. Patients with stage IV cancers which could not be radically resected, emergency operation and conversion to open surgery were excluded. The intracorporeal anastomosis and extracorporeal anastomosis were compared in the items of operation time, postoperative infection and postoperative hospital stay.

RESULTSA total of 194 patients were enrolled in the study, including 73 patients with IA and 121 patients with EA. No significant differences were found in gender, age, previous operation history, tumor site and T stage of the tumor between two groups (all P>0.05). There were also no significant differences in mean operative time (162.4 minutes vs. 167.7 minutes, P=0.257), time to first flatus (3.3 days vs. 3.4 days, P=0.744), number of harvested lymph nodes (30.3 nodes vs. 33.8 nodes, P=0.071) and postoperative hospital stay (7 days vs. 7 days, P=0.067) between two groups. The incidence of intra-abdominal infection in patients with IA was significantly higher than that in those with EA [13.7%(10/73) vs. 1.7%(2/121), P=0.001], while the differences of the incidence of wound infection [1.4%(1/73) vs. 3.3%(4/121), P=0.652], respiratory infection [1.4%(1/73) vs. 3.3%(4/121), P=0.652] and urinary tract infection [2.7%(2/73) vs. 0.8%(1/121), P=0.558] were not significant.

CONCLUSIONCompared with EA, IA may increase the risk of intra-abdominal infection in patients undergoing laparoscopic right hemicolectomy.

Objective To investigate the advantages and disadvantages of transanal total mesorectal excision with laparoscopic assisted for min-low rectal cancer.Methods Retrospectively analyzed the clinical data of 38 patients with min-low rectal cancer who undement laparoscopically assisted transanal total anorectal rectal cancer from November 2014 to May 2018 in the Department of General Surgery,Peking Union Medical College Hospital,Chinese Academy of Medical Sciences and Peking Union Medical College.The main outcome measures included gender,BMI,the operating time,intra-operative blood loss,the intraand post-operative complication rate,the distal resection margin length and the circumferential resection margin status of the pathological specimen,the number of lymph nodes acquisitions,as well as the postoperative average hospitalization time.Results The surgery was completed smoothly for all patients in this studying,with no conversion to open surgery.Among all the 38 patients,there were 26 (68.4％) male cases and 12(31.6％) female cases,and 25 cases were with a body mass index (BMI) over 24 kg/m2.The average operating time was (175.2 ± 37.6) minutes.The average intra-operative blood loss was (63.9 ± 42.7) ml.The complications included 1 case of intra-operative presacral venous hemorrhage,and 6 cases of post-operative anastomotic leak (15.8％).There were 18 cases happened perioperative complications,and the rate was 47.4％.The average distance from the distal resection margin to the lower end of the tumor was (2.1 ± 0.4) cm.There were 34 cases of complete mesorectal excision.The average number of lymph nodes retrieved was 14.2 ± 4.5.The average postoperative hospital stay was (9.8 ±5.9) days.Conclusion Transanal total mesorectal excisionwithlaparoscopic-assisted formid-lowrectal cancer can more accurately ensure adequate distal margin and mesorectal integrity.