Hypoxic hepatitis, also known as ischemic hepatitis, is characterized by acute hepatocellular injury due to inadequate oxygen delivery to the liver. Celiac trunk stenosis can lead to hepatic ischemia and subsequent li...Hypoxic hepatitis, also known as ischemic hepatitis, is characterized by acute hepatocellular injury due to inadequate oxygen delivery to the liver. Celiac trunk stenosis can lead to hepatic ischemia and subsequent liver damage. We present the case of an 81-year-old patient with a history of hypertension, ischemic heart disease, hypothyroidism, and biliary lithiasis, who developed hypoxic hepatitis secondary to Dunbar syndrome and a stenosis of the superior mesenteric artery. The patient improved symptoms and liver function tests with conservative management, including intravenous fluids and supportive care. Long-term management involved continued antiplatelet therapy and statins, with consideration of further interventions for celiac trunk stenosis. This case underscores the importance of recognizing Dunbar syndrome as well as superior mesentery trunk stenosis as a potential cause of hypoxic hepatitis. It highlights the need for multidisciplinary management in such cases.展开更多
The median arcuate ligament syndrome(MALS)is recognized as a rare clinical entity,characterized by chronic post-prandial abdominal pain,nausea,vomiting,and unintentional weight loss.Due to its vague symptomatology,it ...The median arcuate ligament syndrome(MALS)is recognized as a rare clinical entity,characterized by chronic post-prandial abdominal pain,nausea,vomiting,and unintentional weight loss.Due to its vague symptomatology,it is mainly regarded as a diagnosis of exclusion.Patients can often be misdiagnosed for several years before a correct diagnosis is established,also due to a medical team’s clinical suspicion.We present a case series of two patients who suffered from MALS and were treated successfully.The first patient is a 32-year-old woman,presenting with post-prandial abdominal pain and weight loss that have lasted for the past ten years.The second patient,a 50-year-old woman,presented with similar symptomatology,with the symptoms lasting for the last five years.Both cases were treated by laparoscopic division of the median arcuate ligament fibers,which alleviated extrinsic pressure from the celiac artery.Previous cases of MALS were retrieved from PubMed,to assemble a better diagnostic algorithm and propose a treatment method of choice.The literature review suggests an angiography with a respiratory variation protocol as the diagnostic modality of choice,along with the laparoscopic division of the median arcuate ligament fibers as the proposed treatment of choice.展开更多
大量研究发现,社交网络结构对观点的传播动力学特性有显著影响。提出的基于邓巴数限制的网络生成算法--DNCSN(Social Network Generation Algorithm with the Constraint of Dunbar’s Number),具有较小的平均距离和较大的群聚系数,可...大量研究发现,社交网络结构对观点的传播动力学特性有显著影响。提出的基于邓巴数限制的网络生成算法--DNCSN(Social Network Generation Algorithm with the Constraint of Dunbar’s Number),具有较小的平均距离和较大的群聚系数,可以生成与真实网络节点度和节点强度的非线性关系较为接近的结果。基于DNCSN生成算法,可以更为有效地研究社交网络上的观点演化特性。通过调整社交网络中个体的观点“坚定度”和观点取信阈值参数,对比研究了回音室的形成数量变化。研究表明当网络的观点初值均匀分布,网络规模小于邓巴数字时,相比于同等规模的全联通网络,DNCSN网络结构能在节点取信阈值大于0.15时减少网络的回音室的形成数量;当网络规模增大时,DNCSN网络的回音室形成数量多于全联通网络;当取信阈值小于0.1时,全联通网络的回音室形成数量受网络规模影响,且网络规模越小回音室数量越少。展开更多
This paper poses a question:How many types of social relations can be categorized in the Chinese context?In social networks,the calculation of tie strength can better represent the degree of intimacy of the relationsh...This paper poses a question:How many types of social relations can be categorized in the Chinese context?In social networks,the calculation of tie strength can better represent the degree of intimacy of the relationship between nodes,rather than just indicating whether the link exists or not.Previou research suggests that Granovetter measures tie strength so as to distinguish strong ties from weak ties,and the Dunbar circle theory may offer a plausible approach to calculating 5 types of relations according to interaction frequency via unsupervised learning(e.g.,clustering interactive data between users in Facebook and Twitter).In this paper,we differentiate the layers of an ego-centered network by measuring the different dimensions of user's online interaction data based on the Dunbar circle theory.To label the types of Chinese guanxi,we conduct a survey to collect the ground truth from the real world and link this survey data to big data collected from a widely used social network platform in China.After repeating the Dunbar experiments,we modify our computing methods and indicators computed from big data in order to have a model best fit for the ground truth.At the same time,a comprehensive set of effective predictors are selected to have a dialogue with existing theories of tie strength.Eventually,by combining Guanxi theory with Dunbar circle studies,four types of guanxi are found to represent a four-layer model of a Chinese ego-centered network.展开更多
文摘Hypoxic hepatitis, also known as ischemic hepatitis, is characterized by acute hepatocellular injury due to inadequate oxygen delivery to the liver. Celiac trunk stenosis can lead to hepatic ischemia and subsequent liver damage. We present the case of an 81-year-old patient with a history of hypertension, ischemic heart disease, hypothyroidism, and biliary lithiasis, who developed hypoxic hepatitis secondary to Dunbar syndrome and a stenosis of the superior mesenteric artery. The patient improved symptoms and liver function tests with conservative management, including intravenous fluids and supportive care. Long-term management involved continued antiplatelet therapy and statins, with consideration of further interventions for celiac trunk stenosis. This case underscores the importance of recognizing Dunbar syndrome as well as superior mesentery trunk stenosis as a potential cause of hypoxic hepatitis. It highlights the need for multidisciplinary management in such cases.
文摘The median arcuate ligament syndrome(MALS)is recognized as a rare clinical entity,characterized by chronic post-prandial abdominal pain,nausea,vomiting,and unintentional weight loss.Due to its vague symptomatology,it is mainly regarded as a diagnosis of exclusion.Patients can often be misdiagnosed for several years before a correct diagnosis is established,also due to a medical team’s clinical suspicion.We present a case series of two patients who suffered from MALS and were treated successfully.The first patient is a 32-year-old woman,presenting with post-prandial abdominal pain and weight loss that have lasted for the past ten years.The second patient,a 50-year-old woman,presented with similar symptomatology,with the symptoms lasting for the last five years.Both cases were treated by laparoscopic division of the median arcuate ligament fibers,which alleviated extrinsic pressure from the celiac artery.Previous cases of MALS were retrieved from PubMed,to assemble a better diagnostic algorithm and propose a treatment method of choice.The literature review suggests an angiography with a respiratory variation protocol as the diagnostic modality of choice,along with the laparoscopic division of the median arcuate ligament fibers as the proposed treatment of choice.
文摘大量研究发现,社交网络结构对观点的传播动力学特性有显著影响。提出的基于邓巴数限制的网络生成算法--DNCSN(Social Network Generation Algorithm with the Constraint of Dunbar’s Number),具有较小的平均距离和较大的群聚系数,可以生成与真实网络节点度和节点强度的非线性关系较为接近的结果。基于DNCSN生成算法,可以更为有效地研究社交网络上的观点演化特性。通过调整社交网络中个体的观点“坚定度”和观点取信阈值参数,对比研究了回音室的形成数量变化。研究表明当网络的观点初值均匀分布,网络规模小于邓巴数字时,相比于同等规模的全联通网络,DNCSN网络结构能在节点取信阈值大于0.15时减少网络的回音室的形成数量;当网络规模增大时,DNCSN网络的回音室形成数量多于全联通网络;当取信阈值小于0.1时,全联通网络的回音室形成数量受网络规模影响,且网络规模越小回音室数量越少。
基金project number:20182001706the support of Tsinghua-Gottingen Student Exchange Project IDS-SSP-2017001.
文摘This paper poses a question:How many types of social relations can be categorized in the Chinese context?In social networks,the calculation of tie strength can better represent the degree of intimacy of the relationship between nodes,rather than just indicating whether the link exists or not.Previou research suggests that Granovetter measures tie strength so as to distinguish strong ties from weak ties,and the Dunbar circle theory may offer a plausible approach to calculating 5 types of relations according to interaction frequency via unsupervised learning(e.g.,clustering interactive data between users in Facebook and Twitter).In this paper,we differentiate the layers of an ego-centered network by measuring the different dimensions of user's online interaction data based on the Dunbar circle theory.To label the types of Chinese guanxi,we conduct a survey to collect the ground truth from the real world and link this survey data to big data collected from a widely used social network platform in China.After repeating the Dunbar experiments,we modify our computing methods and indicators computed from big data in order to have a model best fit for the ground truth.At the same time,a comprehensive set of effective predictors are selected to have a dialogue with existing theories of tie strength.Eventually,by combining Guanxi theory with Dunbar circle studies,four types of guanxi are found to represent a four-layer model of a Chinese ego-centered network.
