Although there are numerous case resource,there still exist a relatively long distance in clinical research in China in comparison with developing countries because of inadequate recognition and funding,which has greatly affected the development of standardization of clinical medical in China for the past few decades.With the deepening of recognition and increasing of special support to clinical medical research in China,the development based on clinic research will face new opportunities.As a result,it is necessary for ophthalmologists to explore clinical issues,leverage from the mega trend of clinical research and deliver high-quality results.To achieve this goal,ophthalmologists will have to constantly update their knowledge base,standardize clinical practice and improve diagnosis methods.So far,challenges persist in clinical research in ophthalmology as follows:It is difficult to get funding for clinical research project;It is difficult to get ethnics approval for clinical research project;The research design for forward-looking projects is yet to be standardized;Cross-disciplinary collaboration needs to be enhanced.This review was expected to inspire more attention from clinical research specialists and consequently more highquality clinical studies.

Objective:To explore the characteristics of original site of premature ventricular contraction (PVC) in pa‐tiets with acute myocardial infarction (AMI) .Methods:Among ECG‐detected single‐source PVC patients ,a total of 150 idiopathic PVC patients and 150 AMI patients were randomly selected as control group and AMI group respec‐tively .Original sites of PVC was compared between AMI group and control group and between left and right ventri‐cle of AMI group ,and the relationship between original sites of PVC and diseased coronary in AMI patients was an‐alyzed .Results:Compared with control group ,there was significant rise in percentage of PVC originated from left ventricular apex (6.0% vs .46.0% ) ,and significant reductions in percentages of PVC originated from right ventric‐ular outflow tract (54.7% vs .27.3% ) and right ventricular anterior wall (10.0% vs .3.3% ) in AMI group , P<0.05 or <0.01. In AMI group ,compared with PVC originated from right ventricular outflow tract ,there was sig‐nificant rise in incidence rate of PVC originated from left ventricular apex (27.3% vs .46.0% ) , P=0.001 ;com‐pared with right ventricle , there was significant reduction in incidence rate of outflow tract PVC (66.1% vs . 13.6% ) ,and significant rise in incidence rate of apex PVC (24.4% vs .78.4% ) in left ventricle , P<0.01 both . Relevance test analysis of two‐way disordered classified data indicated that diseased coronary was not related to orig‐inal sites of PVC in AMI patients (χ2 =0.519 ,P=0.134) .Conclusion:Original sites of premature ventricular con‐traction has its own characteristics in patients with acute myocardial infarction ,which may possess certain guidance significance for its treatment .

Objective To observe the subfoveal choroidal thickness (SFCT) in eyes of patients with diabetic macular edema (DME).Methods Twenty patients (32 eyes) with DME were enrolled in this crosssectional observational study.The patients included 12 males and eight females,with a mean age of (47.3± 10.2) years.All the patients were examined documenting best corrected visual acuity (BCVA),spectraldomain optical coherence tomography (OCT) and ophthalmological examination.According to OCT DME morphology,samples are divided into diffuse macular edema,cystoid macular edema,serous retinal detachment and hard exudate groups.The SFCT was measured by a Cirrus HD-OCT with enhanced depth imaging (EDI) and was compared with the average SFCT (286.84 ± 28.80) μm of same age group.Correlation between SFCT and age,diopter,diabetic duration,fasting blood glucose,BCVA and central retinal thickness were analyzed by Pearson Analysis.SFCT of different DME types were analyzed by ANOVA Analysis.Results The mean SFCT of 32 eyes was (223.81±43.74) μm (ranging from 120.50 to 361.50 μm),which was lower by 63.03 μm (95％ confidence interval,-78.80 to-47.26 μm,P＜0.01)from normal SFCT.SFCT was independent of age (r=0.124),diopter (r=0.277),diabetic duration (r=0.286),fasting blood glucose (r=0.408),BCVA (r=0.087),and central retinal thickness (r=0.036).There was no significant difference of SFCT between different DME types (F =0.042,P ＞ 0.05).Conclusion SFCT is thinner in eyes with DME as compared to normal eyes of the same age.

To explore the feasibility of rapid proto-typing ( RP) technology in the treatment of Standford type A aortic dissection. 5 patients with Standford type A aortic dissection received computed tomography angiography (CTA) of their aortas. The CTA images were then processed by 3D reconstruction with MIMICS16. 0 in order to create aortic dissection models through RP technology based on real patient aorta size with a ratio of 1 ∶ 1 . Accord-ing to these models, the surgeons were able to fully understand the aortic diseases of patients, thus establish indi-vidualized treatment strategies for each patient. Besides, the surgeons simulated operations on the models, which helped them achieve better results in real surgery. These patients experienced no post-operative complications and were discharged from hospital with recovery. In conclusion, RP technology can provide adequate preoperotive prep-arations for patients with Standford type A aortic dissection, improve operation efficiency and accuracy in aortic dis-section and guide precise proximal anchoring of stents during intracavitary therapy.

The aim of our study was to observe the effect of diabetes melitus and hy- pertension on cerebral hemodynamics.The flow velocity of cerebral basal arteries were inves- tigated with transcranial Dopplersonography(TCD) in the group of diabetesmellitus,hyper- tension and diabetes combined with hypertension.The results that the flow abnormality in diabetic group(n=48) was41 .7% and in hypertensive group(n=1 6 0 ) was30 % ,respective- ly,butin the group(n=35 ) of diabetes combined with hypertension,the abnormality reae- hed as high as 82 .9% and the abnormal rate of the latest group was significantly higher than former two groups(P

Objective To evaluate the postoperative complications and visual quality after manual small incision cataract surgery (MSICS) versus phacoemulsification (PHACO).Methods A systematic review of MSICS and PHACO was conducted by a computer search on Medline,Pubmed,CBM and CNKI and a supplementary manual search was also done.The effect was measured as an odds ratio (OR) and weighted mean difference (WMD).RevMan 5.0 software was used to perform the Meta-analysis.Results A total of 9 articles were included in the Meta-analysis.Naked visual acuity at 1 week after surgery (OR =0.93,95％ CI 0.68-1.27),posterior capsular ruptured after surgery (OR =1.07,95％ CI 0.73-1.58),corneal edema after surgery (OR =0.90,95 ％ CI 0.70-1.16),surgically induced astigmatism at 1 month after surgery (WMD =0.08,95％ CI-0.02-0.17) in MSICS and PHACO was no statistically significant difference (P ＞0.05).Conclusion MSICS is safe and reliable surgery as same as PHACO for the patients with cataract,MSICS is more consistent with China' s national conditions.

Objective To investigate the prognostic factors of gastrointestinal stromal tumors.Methods From Nov.1999 to Dec.2006,a total of 85 patients were diagnosed by postoperative pathology as gastrointestinal stromal tumors.The relationship between the prognosis of GIST and demographic factors、tumor location、operation style、preoperative metastasis、lymphadenectomy、grading of Fletcher were analyzed retrospectively.Results The 1 year、3 year and 5 year survival rate of these 85 patients were 94%,60%,57%respectively,Univariate analysis indicated that tumor location、operation style、grading of Fletcher and preoperative metastasis were significant predictors of survival(P<0.05),while demographics and lymphadenectomy were not statistically related with prognosis.Multivariate analysis showed that preoperative metastasis was the independent factor predicting the prognosis(P=0.020,β=4.226).Conclusion Radical surgical excision is still the therapy of choice for primary gastrointestinal stromal tumors.Preoperative metastasis is the independent factor predicting poor prognosis,therefore early diagnosis and treatment are very important for GIST.Fletcher grading is also a simple recalls to predict the prognosis of GIST.

Objective To observe the clinical effect of interferon on the treatment of virus keratitis. Meth-ods Review and analysis was made of 476 patients with virus keratitis who was treated with high concentration of an-ti-virus eyedrops and one million unit of α-2b interferon, the clinical safety and effect was evaluated. Result The total cure rate was 59. 1%, and the type from high to low is interstitial、endothelial、epithelial and the total cornea. The total recurrence rate is 23.5% ,and the type from high to low is epithelial,the total cornea,endothelial and inter-stitial. The incidence rate of the adverse effect is 10. 7%. Condusion Systemic administration of interferon has a direct anti-virus effect, and it can raise the cure rate of virus keratitis as well as decrease recurrencerate. One million unit of interferon has a high clinical safety and effect.

Objective To discuss the feasibility and value of routine clinical preoperative examination predicting benign and malignant thyroid nodules. Methods The clinical data of 1630 patients undergoing thyroidectomy for nodular thyroid disease were analyzed retrospectively.The relationship between pathological diagnosis and physical examination,ultrasonographic parameters,the results of laboratory test and nuclear medicine test were examined to build a risk prediction model.The sensitivity,specificity and accuracy of the formula were tested. Results In 387 cystic nodules 0.78％ were malignant; In 1243 solid nodules 17.2％ were malignant.Among the 1243 cases,characters significantly related to malignancy were:age younger than 40 years,solitary lobe involvement,hypoechoic nodule,irregular margins,solid nodule,microcalcification,macrocalcification,max diameter ≤ 2 cm. The prediction formula was: malignancy indicator =0.80 × age + 0.59 × solitary lobe + 0.72 × hypoechoic + 0.82 × irregular margin + 1.32 × solid nodule + 1.90 × microcalcification + 0.70 × macrocalcification + 0.71 × max diameter.The threshold limit value was 2.8,and the sensitivity,specificity and accuracy of which were 74.4％,80.4％ and 75.2％,respectively. Conclusions Benign and malignant thyroid nodules could be differentiated roughly with the combination of patients' general information and the results of routine examination before operation.

Atopic dermatitis (AD) is an inflammatory skin disease closely related to impairment of skin barrier function.Hereditary factors,life style and exposure to the environment all contribute to the occurrence of AD.Even though AD occurs mostly in infants,sometimes it may initially occur in adults,which is called adult-onset AD (AOAD).There are evident differences in types,immunological mechanisms and association with other diseases between childhood AD and AOAD.The lesional distribution of AOAD is similar to that of childhood AD,while AOAD is characterized by subacute and chronic dermatitis,and mainly manifests as dry hypertrophic lesions rarely complicated with exudation.Th1/Th2 imbalance and hyperfunction of antigen-presenting cells are immunological basis of AD occurrence.Moreover,FLG gene mutations are associated with the occurrence of AD.Acquired expression defect in the FLG gene induced by elevated levels of interleukin-13 (IL-13) only occurs in adults,suggesting that AOAD is different from AD that initially occurs during infancy and continues into adulthood.Infection,changes of bacterial flora in the skin and intestinal tract,and smoking are all important causative factors of AOAD,thus enquiries about histories of related diseases and smoking are helpful for the diagnosis of AOAD.