Microstructure and mechanical properties of Al-Zn-Cu-Mg-Sc-Zr alloy after retrogression and re-aging treatments

The mechanical properties and stress corrosion cracking （SCC） resistance of an Al-Zn-Cu-Mg-Sc-Zr alloy under different aging conditions were investigated. The dependence of microstrueture and mechanical properties on aging parameters was evaluated by tensile test, hardness test and conductivity measurement. The results show that for the alloys with retrogression and re-aging treatment （RRA）, the conductivity increases with the retrogression time and temperature, while the tensile strength decreases. The transmission electron microscopy （TEM） results show that the precipitates η（MgZn2） at grain boundary aggregate apparently with retrogression time and the precipitates inside the matrix exhibit the similar distribution to T6 temper, which comprises fine GP zones, large η＇（MgZn2）and η（MgZn2） phases. According to the mechanical properties and microstructure observations, the optimal RRA regime is recommended to be 120℃, 24h ＋ 180 ℃, 30 min ＋ 120 ℃, 24 h. The strength level of the alloy after the optimum RRA treatment is similar to that in T6 condition and the SCC resistance is improved obviously in contrast to T6 condition.

Multivariate analysis of oral mucosal ulcers during orthodontic treatment

BACKGROUND Orthodontic treatment can easily cause local soft tissue reactions in the oral cavity of patients under mechanical stress,leading to oral mucosal ulcers and affecting their quality of life.At present,only limited literature has explored the factors leading to oral ulcers in orthodontic treatment,and these research results are still controversial.AIM To investigate the current status and related factors of oral mucosal ulcers during orthodontic treatment,aiming to provide a valuable reference for preventing this disease in clinical practice.METHODS A total of 587 patients who underwent orthodontic treatment at the Peking University School of Stomatology and Hospital of Stomatology between 2020 and 2022 were selected and allocated to an observation or control group according to the incidence of oral mucosal ulcers during orthodontic therapy.A questionnaire survey was constructed to collect patient data,including basic information,lifestyle and eating habits,treatment details,mental factors,and trace element levels,and a comparative analysis of this data was performed between the two groups.RESULTS A logistic regression model with oral ulcers as the dependent variable was established.The regression results showed that age(≥60 years:odds ratio[OR]:6.820;95%confidence interval[CI]:2.226–20.893),smoking history(smoking:OR:4.434;95%CI:2.527–7.782),toothbrush hardness(hard:OR:2.804;95%CI:1.746–4.505),dietary temperature(hot diet:OR:1.399;95%CI:1.220–1.722),treatment course(>1 year:OR:3.830;95%CI:2.203–6.659),and tooth brushing frequency(>1 time per day:OR:0.228;95%CI:0.138–0.377)were independent factors for oral mucosal ulcers(P<0.05).Furthermore,Zn level(OR:0.945;95%CI:0.927–0.964)was a protective factor against oral ulcers,while the SAS(OR:1.284;95%CI:1.197–1.378)and SDS(OR:1.322;95%CI:1.231–1.419)scores were risk factors.CONCLUSION Age≥60 years,smoking history,hard toothbrush,hot diet,treatment course for>1 year,tooth brushing frequency of≤1 time per day,and mental anxiety are independent risk factors for oral mucosal ulcers.Therefore,these factors should receive clinical attention and be incorporated into the development and optimization of preventive strategies for reducing oral ulcer incidence.

Regression of Barrett＇s Esophagus： Is There a Difference between Clinical and Surgical Treatment？

Objective： To evaluate the response to clinical and surgical treatment of Walter Cantidio University Hospital patients who were diagnosed with Barrett＇s esophagus between 2012 and 2016. Methodology： From the database analysis of Walter Cantidio University Hospital＇s pathology service, we identified all patients with a diagnosis of Barrett＇s esophagus between 2012 and 2016. We analyzed the patients＇ medical records and collected epidemiological and clinical data. Results： 22 patients were included in the study, 13 of whom were surgically treated and 9 were clinically treated. The regression was 33.3% in the clinical group and 30.7% in the surgical group, with no statistical difference between these two groups. Conclusions： The results show synchrony with data from the medical literature regarding the response of Barrett＇s esophagus to clinical and surgical treatment.

A sludge volume index (SVI) model based on the multivariate local quadratic polynomial regression method

In this study, a multivariate local quadratic polynomial regression(MLQPR) method is proposed to design a model for the sludge volume index(SVI). In MLQPR, a quadratic polynomial regression function is established to describe the relationship between SVI and the relative variables, and the important terms of the quadratic polynomial regression function are determined by the significant test of the corresponding coefficients. Moreover, a local estimation method is introduced to adjust the weights of the quadratic polynomial regression function to improve the model accuracy. Finally, the proposed method is applied to predict the SVI values in a real wastewater treatment process(WWTP). The experimental results demonstrate that the proposed MLQPR method has faster testing speed and more accurate results than some existing methods.

Lymph node regression grading of locally advanced rectal cancer treated with neoadjuvant chemoradiotherapy

Neoadjuvant chemoradiotherapy(nCRT)and total rectal mesenteric excision are the main standards of treatment for locally advanced rectal cancer(LARC).Lymph node regression grade(LRG)is an indicator of prognosis and response to preoperative nCRT based on postsurgical metastatic lymph node pathology.Common histopathological findings in metastatic lymph nodes after nCRT include necrosis,hemorrhage,nodular fibrosis,foamy histiocytes,cystic cell reactions,areas of hyalinosis,residual cancer cells,and pools of mucin.A number of LRG systems designed to classify the amount of lymph node regression after nCRT is mainly concerned with the relationship between residual cancer cells and regressive fibrosis and with estimating the number of lymph nodes existing with residual cancer cells.LRG offers significant prognostic information,and in most cases,LRG after nCRT correlates with patient outcomes.In this review,we describe the systematic classification of LRG after nCRT,patient prognosis,the correlation with tumor regression grade,and the typical histopathological findings of lymph nodes.This work may serve as a reference to help predict the clinical complete response and determine lymph node regression in patients based on preservation strategies,allowing for the formulation of more accurate treatment strategies for LARC patients,which has important clinical significance and scientific value.

Risk factors of regression and undercorrection in photorefractive keratectomy: a case-control study

AIM: To determine risk factors of regression and undercorrection following photorefractive keratectomy (PRK) in myopia or myopic astigmatism. METHODS: A case -control study was designed in which eyes with an indication for re-treatment (AT) were defined as cases; primary criteria for RT indication, as assessed at least 9mo postoperatively, included an uncorrected distance visual acuity (UDVA) of 20/30 or worse and a stable refraction for more than 3mo. Additional considerations included optical quality symptoms and significant higher order aberrations (HOAs). Controls were chosen from the same cohort of operated eyes which had complete post-operative follow up data beyond 9mo and did not need RT. The cohort included patients who had undergone PRK by the Tissue-Saving (TS) ablation profile of Technolas 217z100 excimer laser (Bausch & Lomb, Rochester, NY, USA). Mitomycin C had been used in all of the primary procedures. RESULTS: We had 70 case eyes and 158 control eyes, and they were comparable in terms of age, sex and follow -up time (P values: 0.58, 1.00 and 0.89, respectively). Pre-operative spherical equivalent of more than -5.00 diopter (D), intended optical zone (OZ) diameter of less than 6.00 mm and ocular fixation instability during laser ablation were associated with AT indications (all P values <0.001). These factors maintained their significance in the multiple logistic regression model with odd ratios of 6.12, 6.71 and 7.89, respectively. CONCLUSION: Higher refractive correction (>-5.00 D), smaller OZ (<6.00 mm) and unstable fixation during laser ablation of PRK for myopia and myopic astigmatism were found to be strong predictors of undercorrection and regression.

A Predictive Modeling Based on Regression and Artificial Neural Network Analysis of Laser Transformation Hardening for Cylindrical Steel Workpieces

Laser surface hardening is a very promising hardening process for ferrous alloys where transformations occur during cooling after laser heating in the solid state. The characteristics of the hardened surface depend on the physicochemical properties of the material as well as the heating system parameters. To exploit the benefits presented by the laser hardening process, it is necessary to develop an integrated strategy to control the process parameters in order to produce desired hardened surface attributes without being forced to use the traditional and fastidious trial and error procedures. This study presents a comprehensive modelling approach for predicting the hardened surface physical and geometrical attributes. The laser surface transformation hardening of cylindrical AISI 4340 steel workpieces is modeled using the conventional regression equation method as well as artificial neural network method. The process parameters included in the study are laser power, beam scanning speed, and the workpiece rotational speed. The upper and the lower limits for each parameter are chosen considering the start of the transformation hardening and the maximum hardened zone without surface melting. The resulting models are able to predict the depths representing the maximum hardness zone, the hardness drop zone, and the overheated zone without martensite transformation. Because of its ability to model highly nonlinear problems, the ANN based model presents the best modelling results and can predict the hardness profile with good accuracy.

基于人工蜂群算法的支持向量回归建模及其在污水处理中的应用

污水处理过程具有大时滞、非线性、多扰动等特点,运行过程中存在生化需氧量(Biochemical Oxygen Demand,BOD)等重要水质参数难以实时测量问题,软测量技术为解决该问题提供了有效方法。对此,文章提出基于人工蜂群算法的支持向量回归(Support Vector Regression,SVR)建模方法。该方法利用蜂群算法对支持向量机的参数gamma和C进行寻优,找到使均方误差最小的超参数组合,以提高模型预测精度。同时,利用加州大学欧文分校(University of California Irvine,UCI)数据库中的污水生产数据验证该方法的有效性,结果表明该方法的实际应用效果好,可为工业生产中难以测量变量的监测提供技术支持。

三种补液方式预防即发型及迟发型献血相关血管迷走神经反应的效果研究:基于群组随机试验

目的对比3种献血前补液方式对预防即发型及迟发型献血相关血管迷走神经反应(vasovagal response,VVR)的效果。方法2021年1—6月,在本中心6个固定献血点对符合献血条件,签署知情同意的6250名全血献血者,按献血点和日期分为198个群组,按随机数法随机分配到口服补液盐(ORS)组,糖水组或饮用水组,分别在献血前20 min内喝完500 mL饮用水,糖水及ORS,研究人员现场记录干预的实际完成情况,并登记现场发生的VVR及相关情况。献血后休息时,献血者完成包含社会人口学信息的电子问卷。献血后48 h,研究人员电话回访每位献血者,登记迟发型VVR及相关情况。基于意向性分析法(ITT)Logistic回归分析3组间VVR发生率差异,考虑到依从性的影响,计算干预组的平均处理效应(ATT)。用PASS 2021估算样本量,R(4.2.0)做统计分析。结果本中心固定点全血献血者在3种不同的献血前补液方式干预下,献血相关VVR的累计发生率为2.67%(2.29%~3.11%),其中,即发型和迟发型VVR的发生率分别为1.02%(0.79%~1.31%)和1.65%(1.36%~2.01%)。ITT分析仅发现ORS比水组可有效降低迟发型VVR发生率【OR=0.59,95%CI[0.37,0.94]】。ATT分析考虑了依从性的影响发现:任意两组间即发型VVR发生率差异均无统计学意义(P>0.05);糖水组对比饮用水组的迟发型VVR发生率差异无统计学意义(P>0.05)。补充ORS对比饮用水,迟发型VVR发生率平均下降值相差了-0.013,95%CI[-0.022,-0.004],补充ORS对比糖水,迟发型VVR发生率平均下降值相差了-0.008,95%CI[-0.017,-0.000],差异均有统计学意义(P<0.05)。3个组累计VVR显示了与迟发型VVR相似的结果。结论献血前补充ORS对预防迟发型VVR效果最好,下一步可建立迟发型VVR预测模型甄别易感人群,建议其献血前喝ORS,其他人群献血前可根据喜好任选液体,实现献血相关VVR的个性化防控。

内镜下黏膜切除术治疗结肠息肉效果及复发相关因素分析

目的探讨内镜下黏膜切除术(EMR)治疗结肠息肉的效果,分析其复发相关因素。方法选取2020年10月—2023年12月收治的结肠息肉120例,根据手术方式不同将其分为EMR组(采用EMR,69例)和电切术组(采用内镜下高频电切术,51例)2组。比较2组手术相关指标、临床疗效、并发症和复发情况;采用单因素和多因素Logistic回归分析探讨影响EMR术后结肠息肉复发的相关因素。结果EMR组手术时间、胃肠功能恢复时间和住院时间均短于电切术组,术中出血量少于电切术组(P<0.01)。术后2个月,EMR组总有效率(67/69,97.10%)高于电切术组(44/51,86.27%)(P<0.05);EMR组并发症发生率(2/69,2.90%)低于电切术组(7/51,13.73%)(P<0.05)。术后6个月,2组复发率比较差异无统计学意义(P>0.05)。多因素Logistic回归分析结果显示,体质量指数和息肉直径为影响EMR术后结肠息肉复发的独立危险因素(P<0.01)。结论EMR治疗结肠息肉效果良好,利于改善手术相关指标,减少术后并发症。体质量指数和息肉直径为影响EMR术后结肠息肉复发的独立危险因素。

非小细胞肺癌患者首次住院天数对治疗质量的影响分析

目的基于多项式logistic回归模型,分析不同分期非小细胞肺癌(Non-small cell lung cancer,NSCLC)患者获得最佳治疗质量的住院天数,为提高治疗质量及制定相关政策提供参考。方法收集非小细胞肺癌病例数据,选择16个诊疗过程指标;根据肺癌分期分层,构建多项式logistic回归模型,调整患者特征,分析首次住院天数对综合治疗质量的影响。结果本研究共收集10053例非小细胞肺癌患者,综合治疗质量得分中位数为0.60;根据肺癌分期,将患者分为早期组(Ⅰ~Ⅱ期)、局部晚期组(Ⅲ期)、晚期组(Ⅳ期),各亚组首次住院天数与治疗质量呈非线性关系;多项式模型结果显示,调整患者特征,各亚组患者住院天数及住院天数二次项对治疗质量影响均有统计学意义:早期患者首次住院天数18天、局部晚期和晚期患者首次住院天数22天,获得高治疗质量的概率最大。结论不同分期患者因病情差异大、诊疗方案不同,获得高治疗质量概率最大时所对应的首次住院天数亦不同。医院可通过落实标准化诊疗指南,强化诊疗过程管理,合理控制不同分期患者首次住院时间,以提高治疗质量及医疗效率。

西医常规治疗对慢性阻塞性肺疾病急性加重期患者治疗疗效影响因素分析

目的探讨急性加重期慢性阻塞性肺疾病(AECOPD)患者西医常规治疗方案疗效的影响因素,为临床个体化治疗提供依据。方法纳入100例AECOPD患者,均根据指南标准治疗方案予以治疗。经过3个月的随访观察,53例被评估为有效,纳入有效组;47例被评估为无显著效果,纳入无效组。比较两组患者在年龄、慢性阻塞性肺疾病(COPD)病程、呼吸频率、肺功能及合并恶性肿瘤等基本特征的差异,并收集治疗前实验室检验指标和血气分析数据进行对比。结果两组在年龄、COPD病程、呼吸频率、第1秒用力肺活量/第1秒用力呼气容积占用力肺活量的比率(FEV1/FVC%)、合并恶性肿瘤、血红蛋白、淋巴细胞、C反应蛋白、丙氨酸氨基转移酶、乳酸及二氧化碳分压(PaCO_(2))等方面差异有统计学意义(P<0.05)。单因素Logistic回归分析显示,年龄较大、COPD病程延长、呼吸频率增加、FEV1/FVC%降低、合并恶性肿瘤、血红蛋白降低、淋巴细胞计数降低、C反应蛋白升高、丙氨酸氨基转移酶升高、乳酸升高及PaCO_(2)升高是AECOPD治疗效果不佳的危险因素。进一步多因素Logistic回归分析显示,年龄(P=0.007,OR=1.240)、FEV1/FVC%(P=0.014,OR=0.757)、血红蛋白(P=0.038,OR=0.954)、淋巴细胞计数(P=0.007,OR=0.488)以及乳酸(P=0.002,OR=9.964)是影响AECOPD治疗疗效的独立影响因素。受试者工作特征曲线(ROC)分析显示,年龄、FEV1/FVC%、血红蛋白、淋巴细胞计数及乳酸的ROC曲线下面积(AUC)分别为0.728[95%CI(0.627,0.829)]、0.681[95%CI(0.576,0.785)]、0.686[95%CI(0.582,0.790)]、0.629[95%CI(0.520,0.737)]及0.823[95%CI(0.744,0.902)],联合5个危险因素预测AECOPD治疗效果不佳的AUC为0.957[95%CI(0.923,0.991)]。结论年龄、FEV1/FVC%、血红蛋白、淋巴细胞计数及乳酸是影响AECOPD患者治疗效果的独立危险因素。结合这些危险因素的综合分析能够更准确地预测AECOPD治疗效果,帮助临床医生及时调整治疗方案,提高治疗效果和预后。

乳腺癌患者术后并发上肢淋巴水肿的现状及影响因素分析

目的 调查乳腺癌患者术后并发上肢淋巴水肿的现状及其影响因素。方法 采用横断面整群抽样选取2021年2月至2023年8月我院收治的121例乳腺癌术后患者作为研究对象。收集患者的临床资料,采用多因素Logistic回归分析影响乳腺癌患者术后并发上肢淋巴水肿的因素。结果 121例乳腺癌患者中,术后并发上肢淋巴水肿23例,发生率为19.01%。根据术后是否并发上肢淋巴水肿将患者分为发生组(n=23)与未发生组(n=98)。发生组的年龄大于未发生组,体重指数(BMI)≥24 kg/m^(2)占比、有腋窝淋巴结清扫占比、清扫淋巴结数、有术后辅助放疗占比及有术后愈合并发症占比高于未发生组(P<0.05)。多因素Logistic回归分析结果显示,年龄、BMI、腋窝淋巴结清扫、清扫淋巴结数、术后辅助放疗及术后愈合并发症是乳腺癌患者术后并发上肢淋巴水肿的危险因素(P<0.05)。结论 乳腺癌患者术后上肢淋巴水肿发生率较高,年龄、BMI、腋窝淋巴结清扫、清扫淋巴结数、术后辅助放疗及术后愈合并发症均可能影响乳腺癌患者术后上肢淋巴水肿发生情况,临床应及早实施针对性策略加以控制。

浅谈6xxx铝合金停放效应

本文针对6xxx铝合金生产过程中偶有发生时效后的力学性能不合格现象,着重于人们最容易忽略的因素——6xxx铝合金停放效应展开论述。本文综述了近年来6xxx合金停放效应对力学性能的影响,首先论述了6xxx铝合金停放效应产生的原因,其次给出了降低停放效应的具体措施及方法,最终总结了部分6xxx铝合金停放效应对力学性能的影响数据,以期为各位从事6xxx铝合金生产实践的工作人员提供一定的参考及借鉴。

Heat treatment of 7xxx series aluminium alloys—Some recent developments

The 7xxx series alloys are heat treatable wrought aluminium alloys based on the Al-Zn-Mg（-Cu） system. They are widely used in high-performance structural aerospace and transportation applications. Apart from compositional, casting and thermo-mechanical processing effects, the balance of properties is also significantly influenced by the way in which the materials are heat-treated. This paper describes the effects of homogenisation, solution treatment, quenching and ageing treatments on the evolution of the microstructure and properties of some important medium to high-strength 7xxx alloys. With a focus on recent work at Monash University, where the whole processing route from homogenisation to final ageing has been studied for thick plate products, it is reported how microstructural features such as dispersoids, coarse constituent particles, fine-scale precipitates, grain structure and grain boundary characteristics can be controlled by heat treatment to achieve improved microstructure-property combinations. In particular, the paper presents methods for dissolving unwanted coarse constituent particles by controlled high- temperature treatments, quench sensitivity evaluations based on a systematic study of continuous cooling precipitation behaviour, and ageing investigations of one-, two- and three-step ageing treatments using experimental and modelling approaches, in each case, the effects on both the microstructure and the resulting properties are discussed.

Some recent developments in modeling quantile treatment effects

This paper provides a selective review of the recent developments on econometric/statistical modeling in quantile treatment effects under both selection on observables and on unobservables.First,we discuss identification,estimation and inference of quantile treatment effects under the framework of selection on observables.Then,we consider the case where the treatment variable is endogenous or self-selected,for which an instrumental variable method provides a powerful tool to tackle this problem.Finally,some extensions are discussed to the data-rich environments,to the regression discontinuity design,and some other approaches to identify quantile treatment effects are also discussed.In particular,some future research works in this area are addressed.

Analysis of influencing factors of clinical effect of TCM treatment for degenerative lumbar spondylolisthesis

Objective:To explore the related factors that may affect the efficacy of traditional Chinese medicine in treating degenerative lumbar spondylolisthesis.Methods:A total of 535 patients with DLS who were treated in Wangjing Hospital of China Academy of Chinese Medical Sciences and other hospitals from June 2011 to October 2014 were selected.The central random system was used to randomly divide the treatment group and control group.This study included 267 patients in the treatment group using the traditional Chinese medicine program((lumbar spine reduction and lumbar spine rehabilitation),36 cases of severely missing data were excluded,and a total of 231 DLS patients were included.Observation indicators were selected using the Visual Analog Scale(VAS)and the Japanese Orthopaedic Association(JOA)for the evaluation of lumbar vertebral disorders.The clinical efficacy was evaluated using the JOA lumbar pain curative effect evaluation standard[7].[(Joa score after treatment-JOA score before treatment]/(out of 29 points-JOA score before treatment)]×100%.The JOA score and the change of the efficacy index of the patients were observed.According to the JOA efficacy index after the treatment,it was divided into significant effect(≥50%)and poor effect(<50%).Single-factor screening and multi-factor Logistic regression analysis were used.Gender,age,course of disease,BMI index,slip-off segment,slip-off direction,back pain VAS score,total JOA score,back pain-score,lower limb pain and numbness-score,walking ability-score,straight leg elevation test-score,Feeling-scoring,muscle strength-scoring,supine turn-scoring,standing action-scoring,washing action-scoring,standing posture and continuous standing-scoring,long sedentary-scoring,weight lifting and holding-scoring,walking-scoring 2.Bladder function-scores were assigned to logistic regression models for univariate analysis,and meaningful independent variables were screened for multivariate logistic regression.Results:No serious adverse reactions occurred in the patients included in this study.According to the comparison of JOA scores before and after treatment,the results of the index of efficacy index showed that the effective rate of DLS in this project was 96.6%,and a significant effect of 77.6%was achieved.Univariate Logistic regression analysis showed that the duration of disease,supine turn-scoring,washing action-scoring,prolonged sedentary-scoring,weight lifting and keeping-scoring had statistically significant effects on the inclusion of patients with significant efficacy(P<0.05);single factor logistic regression analysis of total score of JOA score before treatment was not statistically significant(P=0.215),but because it is important for evaluating the patient's condition,it was included in multifactor logistic regression analysis at the same time.Course of onset,supine turn-scoring,washing action-scoring,prolonged sedentary-scoring,weight lifting and holding-scoring,JOA score before treatment.Six independent variables were substituted into the two-class logistic regression model for multivariate analysis..Multivariate logistic regression analysis showed that the effects of total JOA score and supine turn-scoring before treatment on the efficacy of patients were statistically significant(P<0.05).There are many factors influencing the efficacy of traditional Chinese medicine treatment of DLS,and the probability of obtaining a significant effect for each additional point of JOA score and supine turn-score before treatment increases by 1.167 and 0.410 times,respectively.Conclusion:The clinical application of lumbar spine reduction combined with lumbar rehabilitation exercises in patients with degenerative lumbar spondylolisthesis with a higher total JOA score or a lower limit of supine turning can achieve better clinical results.This finding has certain guiding significance for the clinical application of this therapy in the treatment of DLS,and is beneficial to improving patient satisfaction and clinical effectiveness.

基于Logistic回归分析217例复杂性肛瘘患者术后肛门功能障碍的中西医危险因素研究

目的 探讨复杂性肛瘘术后并发肛门功能障碍的中西医危险因素。方法 回顾性分析2020年7月至2022年1月福建中医药大学附属人民医院肛肠科收治的217例复杂性肛瘘患者的临床资料。根据是否出现术后肛门功能障碍将患者分为功能障碍组(47例)及功能正常组(170例)。结合患者围手术期情况、手术方式选择、中医诊疗因素3方面变量进行单因素分析及多因素Logistic回归分析。结果 术后并发肛门功能障碍的发生率为21.66%,严重程度以轻度为主[美国克利夫兰医学中心肛门失禁评分(Cleveland Clinic Florida Fecal incontinence score, CCFIS)为(3.72±0.949)分]。多因素Logistic回归分析结果显示:括约肌上瘘(OR=6.036,95%CI 1.809~20.140,P=0.003)、有1次以上的既往手术史(OR=15.597,95%CI 3.371~72.439,P=0.000)、手术方式为切割挂线术(OR=1.435,95%CI 1.088~1.894,P=0.011)、中医证候为气血两虚型(OR=2.762,95%CI 1.002~7.613,P=0.049)或正虚邪恋型(OR=5.339,95%CI 1.277~12.318,P=0.022)5个因素为复杂性肛瘘术后并发肛门功能障碍的独立危险因素(P<0.05);静息压值(OR=0.107,95%CI 0.033~0.345,P=0.000)、术后有中药干预治疗(OR=0.311,95%CI 0.122~0.790,P=0.014)与术后肛门功能障碍呈负相关(P<0.05,OR<1),为术后肛门功能的保护性因素。结论 复杂性肛瘘术后并发肛门功能障碍的西医危险因素为括约肌上瘘、有1次以上既往手术史、手术方式为切割挂线术、低静息压;中医危险因素为气血两虚型或正虚邪恋型肛瘘、术后无中药干预;实现术后风险因素的早期识别,可为临床复杂性肛瘘个体化治疗方案的选择提供良好的参考依据。

基于文本内容分析的互联网医疗平台信息质量评价研究

目的/意义借助文本内容分析法对互联网医疗平台用户发布的信息质量进行评价研究。方法/过程通过Python爬虫获取国内典型互联网医疗平台的文本内容,进行自然语言处理和聚类分析,提取特征指标设计逻辑回归模型并进行灰色关联度修正,从而构建信息质量评价指标体系。结果/结论互联网医疗平台可重点从信息丰富度、信息发布者特征及用户交流互动方面加强信息的发布与呈现,引导用户发布高质量信息并快速识别有价值信息,促进互联网医疗平台的可持续发展。

基于logistic回归分析探究分化型甲状腺癌全切术后3.70 GBq ^(131)I治疗效果的影响因素

目的 探讨分化型甲状腺癌全切术后3.70 GBq131I治疗效果的影响因素。方法 收集2018年7月至2022年5月在广东省清远市人民医院核医学科行初次131I治疗(剂量为3.70 GBq)的分化型甲状腺癌患者151例,根据出院后6~12个月的效果将其分为疗效满意(ER)组(70例)和非ER(NER)组(81例)。收集并比较两组性别、年龄、病理类型、T分期、N分期、甲状腺静态显像阳性率、促甲状腺激素(TSH)、术后间隔时间、24 h放射性摄碘率(24h-RAIU)、血清刺激性甲状腺球蛋白(s Tg),采用多因素logistic回归模型分析影响分化型甲状腺癌全切术后3.70 GBq131I治疗效果的因素。结果 NER组的甲状腺静态显像阳性率和s Tg高于ER组,术后间隔时间短于ER组(P<0.05)。多因素logistic回归分析结果显示,甲状腺静态显像情况(OR=3.470,95%CI:1.559~7.725)、术后间隔时间(OR=0.667,95%CI:0.549~0.811)、s Tg(OR=1.092,95%CI:1.046~1.141)是分化型甲状腺癌全切术后3.70GBq131I治疗效果的独立影响因素(P<0.05)。结论 甲状腺静态显像情况、术后间隔时间及s Tg水平与分化型甲状腺癌患者全切术后使用3.70 GBq131I治疗的效果有关,临床中应对这三项指标异常的患者给予关注。