Objective To study the changes of learning-memory ability and synapse of hippocampus after radiation injuries. Methods Sprague-Dawley rats were grouped according to radiation dose to 20Gy group,30Gy group radiated by linear accelerator and control group were used before radiation and 120 days after radiation. Morris maze test were taken to study the learning and memory ability of rats in each group. Average escape latency and search strategy were scaled and analyzed in each group. The parameters of synapse in CA3 area of hippocampus were studied by using electron microscope and image analyzer. Results AEL of 20Gy group was (41. 17 ±10.76 ) s and score of SS was 27.13 ± 2.34 after 120 days' radiation but AEL of 30 Gy group was (78.49 ± 9.32)s and the score of SS was (23.19 ± 7.65 ) nm. There were significant statistic differences Compared with control group and before radiation (P ＜ 0.05 ). The thickness of PSD of 20 Gy group was ( 22.03 ± 6.84 ) nm after 120days' radiation and (23.19 ± 7.65 )nm in 30 Gy group. There were significant statistic differences compared with control group and before radiation. It was observed that both in 20 Gy and 30 Gy group' s the length of synaptic activity area was shorter,the curvature of synaptic interface was smaller,the width of synaptic cleft and the thickness of PSD was narrower than that of control group. Conclusion There was close relation between the changes of learning-memory ability and synapse of hippocampus after radiation injuries.

OBJECTIVE To study the characteristic of nosocomial pulmonary infection to find out the measures for prevention and control.METHODS The patients with radiation brain injuries(RIB) from Oct 2004 to Jun 2007 underwent retrospective investigation.The reasons and sites of pulmoary infection were analyzed.RESULTS The incidence of pulmonary infection of patients with RIB after radiotherapy was 68.5%.Major factors of infection were bulb palsy,invasive treatment and hormone usage.The Gram-negative bacteria were the predominant pathogens.CONCLUSIONS The nosocomial pulmonary infection is related to many factors.Antibiotic usage according to drug susceptibility results and controlling of the risk factors are important measures to reduce the rate of infection.

Objective To evaluate the value of echocardiography in investigation the failure of interventional therapy of VSDs and to increase the successful rate. Methods 15 cases with failure of VSD closure through interventional approach were undertaken measurement of major parameters of the defect on left ventriculography and then followed by Philips 5500 color Doppler US for repeated multi-direction tangential measuring of the size, morphologic change, relation with peripheral structure and individual valvular regurgitation. Results (1) Marginal membranous VSD 10 cases; membranance aneurysm 8 cases, ≥2 outlets 6 cases. Width of basal part of membranous aneurysm was 8 ～ 18 (10 ?2) mm with depth of 3 ～ 10 (6 ? 2) mm, distance from aortic valve was 0 ～ 6 (2 ? 1) mm and from tricuspid valve was 2 ～ 5 (2 ?1) mm; associated with slight tricuspid valvular regurgitation. Aortic valvular regurgitation 5 cases showed slight to mild amount and without membranous aneurysm occurred in 2 cases. (2) Intracristal VSD 5 cases showed the size of defect as 6 ～ 10 (7 ? 1) mm, with distances of 2 ～ 3 (1 ? 0.8) mm from pulmonary valve and 1 ～ 2 (1 ? 0.6) mm from aortic valve associated with slight regurgitation in 4 cases, slight tricuspid valvular regurgitation in 5 cases and aortic valvular prolapse in 4 cases. Conclusions Many factors can influence the direction tangential continuous scanning should be taken for accurate localization and measurement of VSD in order to select the very sight occludor providing high successful rate of occlusion and long term efficacy.

Objective To study the roles of AADC gene therapy for Parkinson’s disease and its action by coadministrating exogenous L dopa and discuss the effectiveness by way of cationic liposome mediated gene transferring into the brain Methods Injecting either the pCDNA3 AADC Liposome or pCDNA3 Liposome complexes into the striatum of Parkinsonian SD rats in experimental and control groups respectively, observing their improvements of rotational behavior, and furthermore, observing the improvement after combining with administration of exogenous L dopa were carried out The expression of AADC were assayed by using immunohistochemical staining Results (1) Intracerebral transplantation of pCDNA3 AADC Liposome complex improved the rotational behavior of Parkinsonian rats in some degree when its being observed at 3,7,14,21 and 28 days( P 0 05), the maximum improvement was at the time of 1 week (2) After coadministration of exogenous L dopa (10 mg/kg weight) per days, the experimental groups reached much more obvious improvement than that in the controls at the same time described above( P 0 05) (3) Immunohistochemical staining showed that the AADC were expressed stably in the striatum Conclusions Increase of AADC gene expression in the brain may improve the rotational behavior of Parkinsonian rats as well as elevate the curative effect of exogenous L dopa therapy, suggesting that it should be helpful to maintain a long term L dopa theraputic effect at a much lower level and avoid all kinds of side effects The technic of intracerebral gene transfer mediated by cationic liposome might be a new method for gene therapy of PD

Objective To evaluate the surgical method and curative effect of minimally invasive percutaneous nephrolithotomy(MPCNL) in treatment of impacted proximal ureteric calculi.Methods 45 cases of proximal ureteric calculi treated with MPCNL were studied retrospectively.Percutaneous nephrostomy was established under the guide of X-ray,B-ultrasound and naked eye,and the nephropathy was extended to F16 through invasive percutaneous.Stones were taken out by ureteropyeloscopic pneumatic lithotripsy with help of hydraulic perfusion pump.Results The surgical time was 15～110 min with the average of 42 min after percutaneous nephrostomy.The average blood loss volume was 30 mL;no severe complications were occurred in the intra-or post-operative time.The rate of complete clearance of stones was 100% in first attempt.The mean hospital stay was 9 d,and the mean postoperative hospital stay was 3.5 d.Conclusion MPCNL used to treat the impacted proximal urethral calculi have satisfied effects and a lot of merits.

Objective To elucidate the diagnosis and treatment of the bladder mixed tumor.Methods 16 cases treated from Jun 1990 to Aug 2004 were reviewed.The clinical manifestations,diagnosis,treatment and prognosis were discussed.Correlative literature was reviewed at the same time.Results 16 cases of the bladder mixed tumor accounted for 6.9% of 223 bladder tumor patients in the same period,of which 7 of 16 were transitional squamous cell carcinoma,4 transitional adenocarcinoma,3 transitional squamous adenocarcinoma and 2 squamous adenocarcinoma mixed tumor.Most of the patients had irritable bladder symptoms and hematurine.Partial cystectomy was undergone for 3 of 16 cases,total cystectomy for 10 and radical total cystectomy for 3.The main treatment was partial or total cystectomy.The overall survival rates at 1,3 and 5 years post operation were 81.3%,56.3% and 12.5% respectively.Conclusion There were higher malignancy and worse prognosis in bladder mixed tumor.Early diagnosis and therapy might prolong survival.Radical total cystectomy seems to be the best method of treatment.

Objective:To study the CT features for solitary fibrous tumor (SFT) in the abdomen and pelvis and to improve the diagnostic accuracy.Methods:Fourteen patients with SFT were collected in our hospital from January,2011 to December,2015.Characteristic of images were analyzed and compared for 10 SFT,which located outside the abdominal organs with extragastrointestinal stromal tumors (EGIST),leiomyosarcoma,and schwannoma.Results:Necrosis and cystic formation were frequently present in SFT in the abdomen and pelvis.CE-CT showed serpentine vessels along the periphery,while pattern of enhancement was maplike inhomogeneous progressive.Comparing with the EGIST or schwannoma,the difference of CT value in non-contrast and the arterial phase were statistically significant (P＜0.05).The numbers of peritumoral circuity vessel were significantly different between SFT and EGIST (~=18.27,P＜0.008) or between SFT and schwannoma (x2=19.25,P＜0.008).Comparing with the leiomyosarcoma or schwannoma,SFT located outside the abdominal organs.We found that tumor necrosis rate was significantly different between SFT and leiomyoscarcoma (x2=8.00,P＜0.008).Conclusion:SFT in the abdomen and pelvis show certain CT characteristics.The CT value in noncontrast and at the arterial phase,tumor necrosis rate,and serpentine vessels along the periphery were pivotal in differentiating SFT from leiomyosarcoma,EGIST and schwannoma.

Although previous publications suggest the 2009 pandemic influenza A(H1N1)virus was reassorted from swine viruses of North America and Eurasia, the immediate ancestry still remains elusive due to the big evolutionary distance between the 2009 H1N1 virus and the previously isolated strains. Since the unveiling of the2009 H1N1 influenza, great deal of interest has been drawn to influenza, consequently a large number of influenza virus sequences have been deposited into the public sequence databases. Blast analysis demonstrated that the recently submitted 2007 South Dakota avian influenza virus strains and other North American avian strains contained genetic segments very closely related to the 2009 H1N1 virus, which suggests these avian influenza viruses are very close relatives of the 2009 H1N1 virus. Phylogenetic analyses also indicate that the2009 H1N1 viruses are associated with both avian and swine influenza viruses circulating in North America. Since the migrating wild birds are preferable to pigs as the carrier to spread the influenza viruses across vast distances, it is very likely that birds played an important role in the inter-continental evolution of the 2009 H1N1virus. It is essential to understand the evolutionary route of the emerging influenza virus in order to find a way to prevent further emerging cases. This study suggests the close relationship between 2009 pandemic virus and the North America avian viruses and underscores enhanced surveillance of influenza in birds for understanding the evolution of the 2009 pandemic influenza.

Objective:To investigate the clinical characteristics of elderly patients with coronavirus disease 2019(COVID-19), in order to provide scientific evidence for the diagnosis and treatment of COVID-19 in elderly patients.Methods:Clinical data of 102 patients with COVID-19 admitted to the B11 East Ward of the Zhongfaxincheng campus and the E1-3 ward of the Guanggu Campus of Tongji Hospital affiliated to Huazhong University of Science and Technology in Wuhan from 1 February 2020 to 28 February 2020 were retrospectively collected and analyzed.Patients were categorized into 2 groups: the elderly group(≥60 years old)and the young and middle-aged group(<60 years old). Differences in epidemiological features, demographics, clinical symptoms, laboratory results and imaging findings between the two groups were retrospectively analyzed.Results:Among 102 patients with COVID-19, 58 were in the elderly group(≥60 years old), with a median age of 67.0(63.8, 71.0)years old, and 44 in the young and middle-aged group(<60 years old), with a median age of 47.5(38.0, 51.8)years old.There was no significant difference in gender ratio between the two groups( χ2=0.033, P=0.855). Of 102 patients, 42.0%(21/50)had close contact with an infected person, 14.0%(7/50)were from infection clusters, and 18.0%(9/50)had suspected hospital-acquired infections.Fever and cough remained the most common symptoms, but gastrointestinal symptoms such as nausea, poor appetite, diarrhea and muscle cramps were also warning signs.Fatigue and cough were the most common presenting symptoms in elderly male patients.Bilateral patchy infiltrates(57.9%, 22/38)and ground-glass opacities(42.1%, 16/38)were the main imaging features and 42.1%(16/38)patients had multiple areas of the lungs involved.Over 50% patients had increased levels of blood glucose, D-dimer, fibrinogen, C-reactive protein, procalcitonin, multiple cytokines and neutrophil-to-lymphocyte ratio, as well as decreased levels of albumin, hemoglobin, hematocrit, lymphocytes and serum calcium.Compared with the young and middle-aged group, the elderly group had higher rates of abnormality in levels of D-dimer and serum calcium( χ2=7.067 and 4.166, P=0.008 and 0.041). Conclusions:Fever and cough are the most common symptoms in elderly patients with COVID-19.Elderly patients with COVID-19 have multiple abnormalities in clinical laboratory test results, which show a certain level of specificity compared with young and middle-aged patients.

Aged ; Atrial Fibrillation ; surgery ; Catheter Ablation ; methods ; Humans ; Male