Despite tre mendous research efforts have been devoted to the analysis of nanoparticles (NPs)biohazard,the potential mechanism for nanotoxicity has not yet been syste mati-cal y elucidated.This review intends to point out the confusions about nanotoxicity in the field and tries to look into the mecha-nism from a new perspective.Currently,there are three puzzles:① no relationship between dose and toxicity could be observed in nanotoxicity;②there is a theory for the″size effects″,however, it cannot explain some cases contrary to the doctrine;③ NPs made of different materials with various sizes could have the same toxic effects through sti mulating oxidative stress.In fact, human body is co mposed of various biological molecules,and the biological function of a living syste m is reflected by the inter-actions and conversions of those molecules.NPs,on the other hand,are the invader of human body which has no ability to transport or convert or digest the foreigner.Thus,NPs could cause celldamage due to the physical blockage of micro-circula-tion,celldestruction due to membrane rando m insertion,and celldysfunction due to physical contacting with big biological mole-cules.The physical damages caused by various NPs could be divided into three categories:adhesion lesion,card inlay and puncture.Above al ,by analyzing wide spectrum of NPs varying in co mposition,shape and size,the author draws a conclusion that physical damage is the origin of nanotoxicity.

Objective:To assess effect of detection of plasma N terminal pro brain natriuretic peptide (NT‐proBNP) and serum cystatin C (Cys C) combined Global Registry of Acute Coronary Events (GRACE) score on heart func‐tion and prognosis in patients with acute coronary syndrome (ACS) .Methods :According to GRACE score ,a total of 136 ACS patients were divided into low risk group (n=29) ,intermediate risk group (n=39) and high risk group (n=68) .Serum Cys C level and plasma NT‐proBNP level were measured in all groups .Incidence rate of major ad‐verse cardiovascular events (MACE) within three and six months was counted .Results:Among ACS patients ,com‐pared with low risk group ,there were significant rise in levels of NT‐proBNP [ (165.80 ± 51.62) ng/L vs .(193.13 ± 74.64) ng/L vs .(985.45 ± 152.69) ng/L] and Cys C [ (0.83 ± 0.38) mg/L vs .(0.9 ± 0.25) mg/L vs .(1.23 ± 0.23) mg/L] ,left ventricular end‐diastolic diameter [six months: (50 ± 3) mm vs .(55 ± 3) mm vs .(59 ± 5) mm] ,significant reduction in left ventricular ejection fraction [LVEF ,six months: (55 ± 7)% vs .(49 ± 5)% vs . (40 ± 7)% ] ,and significant rise in incidence rate of MACE (six months:2.94% vs .9.55% vs .30.88% ) ,and a‐bove indexes in high risk group were significantly higher than those of intermediate risk group except LVEF signifi‐cantly reduced , P<0.05 or <0.01 ;Pearson correlation analysis indicated that NT‐proBNP and Cys C levels were positively correlated with GRACE score (r=0.72 , P<0.05 ; r=0.65 , P<0.05) respectively .Conclusion:NT‐proBNP and Cys C level detection combined GRACE score could exactly response heart function and prognosis .

Objective To research whether double antiplatelet drug combined with pantoprazole can reduce digestive tract damage,or aggravate cardiovascular system side effect.Methods 270 patients diagnosed as ischemic stroke received double antiplatelet drug were randomly divided into two groups.The treatment group received panto-prazole,the control group did not took any gastric drug.The side effect of the digestive and cardiovascular system was observed.Results 268 patients were followed up for 90 days,and digestive system side effect of the treatment group (136 cases)included indigestion in 26 cases(19.11%),stool occult blood(+)in 11 cases(8.08%),melena in 8 cases(5.89%),hematemesis in 0 case,and the control group (132 cases)included indigestion in 42 cases (31.82%),stool occult blood(+)in 23 cases(17.42%),melena in 19 cases(14.39%),hematemesis in 4 cases. There were significant differences between the two groups(χ2 =6.66,4.56,11.2 and 4.18,all P <0.05).Cardiovas-cular system side effect of the treatment group included palpitation or chest distress or chest pain in 4 cases (3.68%),myocardial ischemia diagnosed by electrocardiogram in 4 cases(2.94%),myocardial infarction and died of cardiovascular disease in 0 case,and the control group included palpitation or chest distress or chest pain in 4 cases (3.00%),myocardial ischemia diagnosed by electrocardiogram in 3 cases(2.27%),myocardial infarction and died of cardiovascular disease in 0 case.There were no statistical differences between the two groups(χ2 =6.66 and 4.56, both P >0.05 ).Conclusion Double antiplatelet drug combined with pantoprazole had a positive significance in reducing the digestive tract damage of ischemic stroke patients,and didn't increase the incidence of cardiovascular sys-tem side effect.

Objective: To evaluate diagnostic value of three noninvasive examinations for coronary heart disease (CHD).Methods:A total of 500 subjects, who were suspected of CHD, first received diagnostic coronary angiography (CAG) and hospitalized in our department from May 2014 to May 2015, were selected.According to CAG results, they were divided into non-CHD control group (n=106), single vessel coronary disease group (n=199), double-vessel coronary disease group (n=95) and multi-vessel coronary disease group (n=100, ≥three vessel disease).Besides CAG, all subjects accomplished one of following examinations at least: (1) 24h dynamic ECG (Holter);(2) real-time three-dimensional echocardiography(RT-3DE);(3) radionuclide myocardial perfusion imaging (RMPI).Sensitivity, specificity and accuracy of these three examinations in diagnosing CHD were evaluated.Results: With CAG as the gold standard, compared with Holter and RT-3DE, there were significant rise in sensitivity(68.4%, 69.0% vs.92.9%), specificity (62.9%, 81.4% vs.88.5%) and accuracy (67.1%, 71.2% vs.91.9%) of RMPI (P<0.01 all), only specificity of RT-3DE was significantly higher than that of Holter, P=0.019.Conclusion:Noninvasive examination can be used as important method diagnosing CHD, which are important measures for noninvasive diagnosing and assessing CHD.Accuracy, sensitivity and specificity of RMPI are high, which is worth extending.

Objective To analyze the clinical features,methods of treatment and prognosis of primary neurogenic tumors of mediastinum in patients taking surgical intervention.Methods A database was maintained retrospectively of all patients undergoing surgery for tumor and pathologically diagnosed with primary neurogenic tumors of mediastinum,managed in the Department of Thoracic Surgery,Zhongshan Hospital,Fudan University,Shanghai between Jan.,2008 and Dec.,2014.This work analyzed retrospectively the information about clinical and imaging features,surgical techniques and outcome extracted from medical records.Results Among the 131 cases,78 cases (59.5％) were males,53 cases (40.5％) were females;72 cases were diagnosed incidentally (55.0％),while the other 59 cases (45.0 ％) suffered from different symptoms.The posterior mediastinum was the most principal location with 61 cases in the left and 69 cases in the right,and 1 case remained in the anterior mediastinum.Total 98 cases (74.8％) underwent surgeries via video-assisted thoracic surgery (VATS),5 cases (3.8％) took VATS surgery with small incision,and 28 cases (21.4％) experienced open thoracotomy,with no mortality during perioperative period.Gross total resection was obtained in 130 patients (99.2％).The remaining patient underwent a palliative resection for malignant schwannomas.Of the patients,98 cases had benign schwannomas (74.8％),24 cases had gangliocytomas (18.3％),2 cases had malignant schwannomas (1.5％),2 cases had neurofibromas (1.5％),2 cases had paragangliomas (1.5％),2 cases hadprimitive neurotodermal tumor (PNET) (1.5％) and 1 case had neuroblastomas (0.8％).All patients were followed up from 12 to 95 months with an average of 53 months.A patient with PNET died of tumor metastasis,a patient with malignant schwannomas died after palliative ectomy,and 2 cases died of other reasons.The rest survived until Jan.,2016 with tumor free.Conclusions Nearly no specific clinical symptoms occur in neurogenic tumors of mediastinum.Most of neurogenic tumors of mediastinum are benign with optimistic prognosis after surgical treatment.While malignant neurogenic tumorsusually come with poor prognosis,which places special emphasis on early diagnose together with surgical treatment.

Objective To discuss the etiology and clinical characteristics of human rhinovirus (HRV) as pathogen of central nervous system infection .Methods Two hundred and five cerebrospinal fluid (CSF) specimens were collected from children with fever and convulsions who were admitted to the pediatric intensive care unit with suspicion of central nervous system infection from June 2011 to December 2012 .Genome Lab Genetic Analysis System (GeXP) was applied to detect HRV from CSF .Specimens with positive results were amplified by nested reverse transcription‐polymerase chain reaction and followed by gene sequencing . Clinical data of HRV positive cases were analyzed . Results Of the 205 CSF specimens ,7 samples were positive for HRV ,which were composed of 2 HRV‐A ,1 HRV‐B and 4 HRV‐C (including 1 HRV‐Ca) .There were 6 boys and 1 girl among the 7 positive cases for HRV .Six children were less than 3 years old ,except one was 9 years old .The onset time was mainly concentrated between September and October . The main clinical manifestations were fever and convulsions . The clinical diagnosis before the pathogen confirmation included viral encephalitis ,epilepsy ,febrile convulsion ,benign infantile convulsions with mild gastroenteritis (CwG ) and hand‐foot‐and‐mouth disease ( HFMD ) . Although the disease severity of the 7 cases varied ,all ended with favorable prognosis .Conclusions HRV is one of pathogens of viral central nervous system infection .All types of HRV can cause central nervous system infection ,among which HRV‐C accounts for the majority .The clinical manifestations of HRV central nervous system infection could mimic febrile convulsion ,CwG and HFMD .

Objective:To observe the protective effect of deproteinized extract of calf blood (DECB)on the ethanol-induced liver injury of the mice,and to preliminaryly discuss its mechanism. Methods:Sixty healthy ICR mice were divided into control group,model group,positive drug group,low,medium and high doses of DECB groups (n=10).By intragastric administration,the mice in control group were given 20 mL·kg-1 saline solution, the mice in low,medium and high doses of DECB groups were administrated with 0.125,0.250,0.500 g·kg -1 DECB,and the mice in positive drug group were administrated with 0.63 g·kg -1 Hugan Tablets;once a day for 30 d. 1 h after the last administration,except control group,the mice in other groups were administrated with one-time grant of 50% ethanol 14 mL·kg -1 ,and fasted for 16 h to establish the models of acute alcohol liver injury.The endurance alcohol time and drunk time of the mice were determined,the activities of aspartate aminotransferase (ALT)and alanine transaminase (AST)activity in serum of the mice were detected,the levels of triglyceride (TG),glutathione (GSH)and malonic dialdehyde (MDA)in liver tissue were determined,and the pathological changes of liver tissue were detected.Results:Compared with model group,the drunk symptoms of the mice in different doses of DECB groups were obviously reduced,the endurance time of the mice in high dose of DECB group and positive drug group was prolonged (P <0.05),and the drinking time was shortened (P <0.05);the ALT and AST activities in serum in mediun and high doses of DECB groups were significantly lower than those in model group (P <0.05).Compared with model group,the MDA and TG levels in liver tissue of the mice in medium and high doses of DECB groups and positive drug group were obviously reduced,and the GSH levels were increased (P <0.05);compared with model group,the pathological damages of liver tissue of the mice in high dose of DECB group caused by ethanol were significantly reduced.Conclusion:DECB can improve ethanol-induced liver injury which may be related to the inhibition of hepatic oxidative stress response.

Long chain non coding RNA (LncRNA) is widely involved in various biological processes such as intracellular chromatin modification, transcriptional regulation, nuclear transport, and protein function regulation, and is closely related to various key physiological functions such as immunity and metabolism in the body. NEAT1 (nuclear parapackle assembly transcript 1) is a newly discovered LncRNA, which is an important component of the nuclear substructural paraplaques. It has been proven to regulate downstream protein expression by binding to various miRNAs, thereby regulating the expression of inflammatory factors, epithelial mesenchymal transition, autophagy, apoptosis, proliferation, migration, and other biological processes, Its abnormal expression plays an important role in the pathogenesis of lung diseases such as asthma, chronic obstructive pulmonary disease, pneumonia, pulmonary fibrosis, and lung cancer, and is closely related to the prognosis of non-small cell lung cancer and the sensitivity of anti-tumor drugs. It is expected to become a new biological marker and therapeutic intervention target. This article mainly reviews the latest research progress on the role of NEAT1 in lung diseases.

Objective To investigate the risk factors associated with epididymitis after transurethral resection of prostate.Methods A retrospective analysis of 352 patients with benign prostatic hyperplasia (BPH) who underwent transurethral resection of prostate in X'an Aerospace General Hospital from January 2015 to December 2017 was performed.There were 14 cases of epididymitis and 338 cases of nonepididymitis.Measurement data were expressed as ((x) ± s),t test was used for comparison between groups;count data was expressed by rate (％),and chi-square test was used for comparison between groups.Univariate and multivariate logistic regression analyses were used for factors that may lead to post-urethral epididymitis.Results Univariate logistic regression analysis showed that preoperative leukocytic positive,urine glucose positive and prostate volume had significant effects on postoperative epididymitis (P ＜ 0.05).Multivariate logistic regression analysis showed that prostate volume increased (OR =0.182,P =0.005)was an independent risk factor for postoperative epididymitis.Conclusion The enlargement of prostate volume is an independent risk factor for postoperative epididymitis.For large-volume prostate surgery,the purpose of relieving obstruction can be achieved.

Objective To assess the effect of psychological group on improving the learning attitude of interns in the pediatric clinical practice.Methods This study included 67 medical students who enrolled during 2012 to 2013 and had done the clinical pediatrics in the Second Affiliated Hospital of Shantou University Medical College.The students carried out pediatric clinical practice as requested.Based on the practice of pediatric practice,the psychological group counseling was conducted by voluntary participation.Each psychological group consisted of 5 or 6 students and performed once a week.Each time of psychological group lasted for 1.5 hours and 6 times in total.The students were divided into intervention group and non-intervention group according to whether they participated in psychological group.Each student filled in the Pediatric Clinical Internship Attitude Assessment Form and the College Student Personality Questionnaire at the first week and the last week of pediatric clinical practice.SPSS 17.0 was applied to conduct Chi square test and t test.Results There were 33 students in the intervention group and 40 students in the non-intervention group.The effective rate of questionnaires for intervention group and non-intervention group were 100％ and 85％,respectively.The mental state of pediatric interns between two groups was not different before and after the pediatric clinical practice (P＞0.05).Before pediatric clinical practice,the learning attitude score between two groups was not different [(83.82 ± 8.39) vs.(84.39 ± 8.29),t=-0.28,P=0.781].After pediatric clinical practice,the learning attitude score of pediatric interns who used psychological group teaching model was better than that of pediatric interns who used traditional teaching model [(88.91 ± 7.40) vs.(75.03 ± 11.19),t=-5.969,P=0.000].Conclusion Psychological group can help medical students to develop empathy toward sick children and their parents,and then improve their learning attitude in pediatric practice.The results of this study can provide a preliminary basis for the popularization of psychological group in the whole process of medical internship.