Objective To study the factors affecting the prognosis of vitrectomy in mechanically injured eyes. Methods One hundred and thirty-Seven eyes undergone vitrectomy were in cluded.Recorded to EPIINFO data base were visual acuity (VA) immediately after injury,type and location of injury,the interval from injury to surgical intervention,retinal detachment,basic surgical maneuvers,proliferative vitreo-retinopathy (PVR),stage of trauma,complications,final VA,and final retinal status.Data were analyzed by SAS. Results We got anatomic success in 107 eyes (75.9%).Final VA of 74 eyes (54.1%) were better than 0.02.Multiple-variable analysis showed that the factors significantly affecting prognosis of vitrectomied eyes of mechanical injury were retinal detachment (RD) before surgery,delay of surgical intervention,complexity of surgical maneuvers,complications after surgery. Conclusions RD before surgery,delayed surgical intervention,complexity of surgery and post vitrectomy complications are the most important factors contributing to the poor prognosis of VA and failure of surgery. (Chin J Ocul Fundus Dis，2000，16：139-212)
ObjectiveTo investigate whether there is a causal relationship between reproductive history (number of children, age at first birth) and the risk of hormone-related cancers (breast, endometrial, and ovarian) in women. MethodsUnivariate and multivariate Mendelian randomization (MR) methods were used to investigate the causal effects of the number of children (childlessness in infertile women and number of children ever born in fertile women) and age at first birth on three hormone-related cancers. The inverse variance weighting method was used for the primary analysis, and sensitivity analyses and reliability tests were used to ensure the reliability of the results. ResultsUnivariate MR showed that infertile women had a higher risk of breast cancer compared with fertile women (OR=1.07, 95%CI 1.05 to 1.09, P<0.001). Multivariate MR showed that among fertile women, after accounting for the effect of age at first birth, higher number of children ever born may be associated with lower risk of breast cancer (OR=0.61, 95%CI 0.43 to 0.85, P<0.01). Neither univariate nor multivariate MR found a causal relationship between age at first birth and hormone-related cancers, and no causal relationship was found between the number of children ever born and endometrial and ovarian cancers; sensitivity analyses and reliability tests demonstrated that the results were unlikely to be affected by heterogeneity and horizontal pleiotropy. ConclusionThe more children a normal woman has, the lower her risk of breast cancer. Infertile women face a higher risk of breast cancer.
ObjectiveTo investigate the bidirectional causal relationship between metabolic syndrome (MS) and inflammatory bowel disease (IBD) using Mendelian randomization (MR). MethodsWe extracted genetic variants with strong correlations from genome-wide association study data on MS as instrumental variables. Inverse variance weighting, MR-Egger regression methods, and weighted median methods were used to estimate the causal effect of MS and risk of developing IBD. ResultsInverse variance weighting found that genetically predicted MS was associated with an increased risk of developing IBD overall (OR=1.113, 95%CI 1.020 to 1.216, P=0.017) and Crohn's disease (OR=1.195, 95%CI 1.072 to 1.333, P=0.001). And inverse MR analysis found ulcerative colitis was associated with a reduced risk of developing MS (OR=0.969, 95%CI 0.948 to 0.991, P=0.005). ConclusionThe results based on MR analysis suggest that genetically predicted MS is associated with the risk of IBD as a whole and Crohn's disease and ulcerative colitis are associated with a reduced risk of developing MS.
ObjectiveObservational studies have shown that plasma lipids are associated with the development of neurodegenerative diseases (NDD), but the causal relationship is unclear. This study investigated the causal relationship between 179 liposomes and NDD using a two-sample Mendelian randomization (MR). MethodsA two-sample MR method was used to comprehensively analyze the causal relationship between liposomes and major NDD such as Alzheimer's disease (AD), Parkinson's disease (PD), amyotrophic lateral sclerosis (ALS) and multiple sclerosis (MS). The two sample software package and Phenoscanner database were used to screen for appropriate instrumental variables(TV). In this study, inverse variance weighting (IVW) was used as the primary measure of MR analysis, and various sensitivity tests were performed. ResultsMR-IVW results showed that phosphatidylethanolamine (PE) (OR=0.90, 95%CI 0.83 to 0.99, P=0.03), phosphatidylcholine (PC) (OR=0.92, 95%CI 0.85 to 0.99, P=0.02) and phosphatidylinositol (PI) (OR=0.90, 95%CI 0.83 to 0.99, P=0.03) were protective factors for AD. Sterol ester (OR=1.18, 95%CI 1.04 to 1.34, P=0.01) and cholesterol (OR=1.26, 95%CI 1.02 to 1.56, P=0.03) increased the risk of PD. PE (OR=0.79, 95%CI 0.64 to 0.98, P=0.03) and PC (OR=0.83, 95%CI 0.69 to 0.98, P=0.03) reduced the risk of PD. Diacylglycerol (DAG) (OR=1.24, 95%CI 1.01 to 1.54, P=0.04) and sphingomyelin (SM) (OR=1.13, 95%CI 1.08 to 1.58, P=0.01) were the risk factors for MS. PI (OR=0.77, 95%CI 0.62 to 0.95, P=0.02) and PC (OR=0.74, 95%CI 0.88 to 0.95, P=0.02) were protective factors for MS. PI (OR=1.02, 95%CI 1.01 to 1.04, P=0.02) and triglyceride (TG) (OR=1.03, 95%CI 1.01 to 1.05, P=0.02) increased the risk of ALS, PC (OR=0.98, 95%CI 0.97 to 0.99, P=0.03) decreased the risk of ALS. ConclusionThere is a causal relationship between sterol ester, cholesterol, PC, PE, PI, DAG, SM, TG and different NDD, which will provide theoretical basis and support for further clinical studies.