As an interface between external electronic devices and internal neural nuclei, microelectrodes play an important role in many fields, such as animal robots, deep brain stimulation and neural prostheses. Aiming at the problem of high price and complicated fabrication process of microelectrode, a microelectrode twisting machine based on open source electronic prototyping platform (Arduino) and three-dimensional printing technology was proposed, and its microelectrode fabrication performance and neural stimulation performance were verified. The results show that during the fabrication of microelectrodes, the number of positive twisting turns of the electrode wire should generally be set to about 1.8 times of its length, and the number of reverse twisting rings is independent of the length, generally about 5. Moreover, compared with the traditional instrument, the device is not only inexpensive and simple to manufacture, but also has good expandability. It has a positive significance for both the personalization and popularization of microelectrode fabrication and the reduction of experimental cost.
ObjectiveTo explore the regulation of nuclear factorκB (NFκB) on tumor necrosis factorα (TNFα) expression in the liver and its role in liver injury in rats with acute pancreatitis.MethodsSeventytwo Wistar rats were randomly divided into three groups: acute pancreatitis group (AP), acute pancreatitis treated with pyrrolidine dithiocarbamate (PDTC) group (APP) and sham operation group (SO). The hepatic NFκB activities were determined with electrophoretic mobility shift assays. The expressions of hepatic TNFα mRNA were detected with RTPCR. The levels of serum alanine aminotransferase (ALT) were also measured.ResultsThe NFκB activities were significantly higher in AP and APP groups than those in SO group 3-6 hours after operation. The expressions of TNFα mRNA were ber in AP and APP groups than those in SO group 3-24 hours after operation. The levels of serum ALT were also significantly higher in these two groups than those in SO group 3-24 hours after operation. However, compared with AP group, the activities of NFκB, the expressions of TNFα mRNA and the levels of ALT significantly decreased in APP group.ConclusionThe activation of hepatic NFκB is associated with the liver injury by regulating TNFα mRNA expression in acute pancreatitis.
ObjectiveTo assess the value of palliative surgical treatment for patients with advanced periampullary carcinoma. MethodsThe clinical data of 292 cases of unresectably advanced periampullary carcinoma who had undergone palliative surgical treatment between June 1998 and June 2008 were analyzed retrospectively. ResultsThe mortality and incidence of complications after operation were 0.7% (2/292) and 24.0% (70/292), respectively. The average survival time was 10.3 months (range 4－29 months). Total bilirubin decreased to normal in 243 cases (83.2%) and decreased by 50% in 39 cases (13.4%) after operation. The totally effective rate was 96.6% (282/292). ConclusionsPalliative surgical treatment is a safe method for the patients with unresectably advanced periampullary carcinoma. Hepaticojejunostomy combined with gastrojejunostomy is recommended for these patients.
Myocardial infarction (MI) has the characteristics of high mortality rate, strong suddenness and invisibility. There are problems such as the delayed diagnosis, misdiagnosis and missed diagnosis in clinical practice. Electrocardiogram (ECG) examination is the simplest and fastest way to diagnose MI. The research on MI intelligent auxiliary diagnosis based on ECG is of great significance. On the basis of the pathophysiological mechanism of MI and characteristic changes in ECG, feature point extraction and morphology recognition of ECG, along with intelligent auxiliary diagnosis method of MI based on machine learning and deep learning are all summarized. The models, datasets, the number of ECG, the number of leads, input modes, evaluation methods and effects of different methods are compared. Finally, future research directions and development trends are pointed out, including data enhancement of MI, feature points and dynamic features extraction of ECG, the generalization and clinical interpretability of models, which are expected to provide references for researchers in related fields of MI intelligent auxiliary diagnosis.
ObjectiveTo investigate clinical features and treatment of pancreatic metastasis from cardiac carcinoma.MethodsThe clinicopathological data of a patient with pancreatic metastasis from cardiac carcinoma in the General Hospital of Western Theater Command were retrospectively analyzed. The results of multi-disciplinary treatment (MDT) of this case were summarized.ResultsThe imaging findings of abdomen CT of this patient were that the solid occupying position of the head of pancreas was considered as a new organism. After discussing by the MDT and exclusing operative contraindications, the radical resection of cardiac cancer with pancreaticoduodenectomy and enlarged intraperitoneal lymph node dissection was performed under the general anesthesia. The operation was smooth and the bleeding was about 600 mL. The patient recovered well after the operation and had no serious complications. The patient was discharged on day 10 after the operation. The results of postoperative pathological diagnosis were the cardiac carcinoma with pancreatic head implantation metastasis (stage Ⅱ A, T3M0N0); obstructive jaundice, liver damage, extrahepatic and extrahepatic biliary dilatation. The patient received the intravenous infusion of the oxaliplatin pluse tigualone for 4 courses. The patient was generally in a good condition and had survived 5 months free tumor. The CA19-9 level was 45.6 U/mL (it was 449.60 U/mL before the operation).ConclusionsPancreatic metastasis from cardiac carcinoma is rare and need to be distinguished from primary pancreatic cancer. Survival time is short and prognosis is poor. Clinical symptoms are improved and survival time is prolonged after operation with postoperative chemotherapy.
Objective To discuss the safety and validity of pulmonary endarterectomy (PEA) for chronic thromboembolic pulmonary hypertension (CTEPH) patients with severe right heart failure (RHF). Methods PEA procedures were performed on 36 patients in Fu Wai Hospital from January 2015 to April 2016. There were 28 males and 8 females, with a mean age of 46.56±11.85 years. According to the New York Heart Association (NYHA) cardiac function classification, 36 patients were divided into preoperative severe RHF group (grade Ⅲ-Ⅳ,n=28) and preoperative without severe RHF group (grade Ⅱ,n=8). Hemodynamic parameters before and after PEA were recorded and 3-18 months' follow-up was done. Results All the patients having PEA surgeries had an obvious decrease of mean pulmonary arterial pressure (from 49.53±13.14 mm Hg to 23.58±10.79 mm Hg) and pulmonary vascular resistance (from 788.46±354.60 dyn·s/cm5 to 352.89±363.49 dyn·s/cm5, bothP<0.001). There was no in-hospital mortality among all the patients. Persistent pulmonary hypertension occurred in 2 patients, perfused lung in 2 patients, pericardial effusion in 2 patients. No mortality was found during the follow-up period. All patients improved to NYHA grade Ⅰ-Ⅱ (WHO grade Ⅰ-Ⅱ), and only 2 patients remained in the NYHA grade Ⅲ (P<0.01). Conclusion The CTEPH patients having PEA surgeries had an obvious improvement in both their hemodynamics results and postoperative heart function, which in return could improve their quality of life.