Objective To observe the effect of different calcium concentration peritoneal dialysate on calcium-phosphorus metabohsm in uremia patients under peritoneal dialysis. Methods Forty uremia patients who the first entered peritoneal dialysis were divided into two groups: standard calcium concentration group (20 cases), low calcium concentration group (20 cases). Treated with continuous ambulatory peritoneal dialysis (CAPD), combining with oral calcium carbonate, observing 12 months. Results When the first entering CAPD, serum calcium, phosphorus, calcium-phosphorus product, immunoreactive parathyroid hormone (iPTH) of the two groups had no differences. Hyperphosphatemia, lower iPTH were universal. After 6 months' treatment, hypercalcemia and hyperphosphatemia in standard calcium concentration group got increasingly serious.While in low calcium concentration group, serum calcium, phosphorus, calcium-phosphorus product all decreased significantly, moreover, they were also lower than post-treatment standard calcium concentration group(P<0.01). In the following 6 months, in low calcium concentration group,serum calcium, calcium-phosphorus product maintained at the normal level serum phosphorus also decreased to the normal level iPTH maintained about 150 ng/L. During the treatment, all patients had no hypotension and hyperspasmia. Conclusion Low calcium concentration peritoneal dialysate can ameliorate disorder of calcium-phosphorus metabohsm, delay the appearance of its comphcations.

Objective To investigate the effect of treatment with levothyroxine in early maternal subclinical hypothyroidism (SCH) on the neural development of the progeny. Methods 75 thyroidectomized female Wistar rats were divided randomly into groups of hypothyroidism (CH), SCH, SCH treated with levothyroxine at embryonic day 10 (E10), E13, and E17. There were 15 sham operated controls. Body weight,thyroid function, and the development of progeny by morris water maze, immunohistochemistry, and Nissl's staining of progeny were made. Results Pups from SCH or CH group had significantly lower body weight than euthyroid group ( P＜0. 05 ). Pups from E10, E13 or E17 groups had normal body weight compared to pups of control (P＞0.05). The levels of TSH and total T4( TT4 ) of all pups were normal. The mean latencies were longer in pups from CH, SCH, and E17 group than the control (P＜0.05). The mean escape latencies did not differ between the control and E10 group pups and between the control and E13 pups (P＞0.05). There were changes in the cytoarchitecture of the barrel cortex and of the hippocampus ( toluidine blue-stained sections) in CH, SCH, and E17 pups. The barrel cortex of E10 or E13 pups was similar to that of control pups. The distribution of BrdUlabeled cells was more widespread in CH, SCH, and E17 pups than in control, E10, and E13 progeny.Conclusion Maternal SCH disturbs learning and memory performances, cytoarchitecture and cell migration of the pups. Treatment with levothyroxine in early maternal SCH before E13 improves the cell migration in the developing brain of the progeny.

Objective To evaluate the accuracy and validate the feasibility of auto-segmentation based on self-registration and Atlas in adaptive radiotherapy for cervical cancer using MIM-Maestro software.Methods The CT scan images and delineation results of 60 cervical cancer patients were obtained to establish the Atlas template database.The planning CT (pCT) and replanning CT (rCT) images were randomly selected from 15 patients for the contouring of clinical target volume (CTV) and organs at risk (OAR) by an experienced radiation oncologist.The rCT images of 15 patients were auto-contoured using Atlas-based auto-segmentation (Atlas group),and mapping contours from the pCT to the rCT images was performed by rigid and deformable image registration (rigid group and deformable group).The time for the three methods of auto-segmentation was also recorded.The similarity of the auto-contours and reference contours was assessed using dice similarity coefficient (DSC),overlap index (OI),the average hausdorff distance (AHD) and the deviation of centroid (DC),and the results were statistically compared among three groups by using one-way analysis of variance.Results The mean time was 89.2 s,22.4 s and 42.6 s in the Atlas,rigid and deformable groups respectively.The DSC,OI and AHD for the CTV and rectum in the rigid and deformable groups significantly differed from those in the Atlas group (all P＜0.001).In the rigid and deformable groups,the OI for the intestine significantly differed from that in the Atlas group.The mean DSC for CTV was 0.89 in the rigid and deformable groups,and 0.76 in the Atlas group.The optimal delineation of the bladder,pelvis and femoral heads was obtained in the deformable group.Conclusions AIl three methods of auto-segmentation can automatically and rapidly contour the CTV and OARs.The performance in the deformable group is better than that in the rigid and Atlas groups.

Objective To explore the myopia control effect of orthokeratology(OK)lenses and build a prediction model of myopia control effect based on random forest and Logistic regression,so as to provide a basis for further impro-ving adolescent vision.Methods A total of 289 patients who wore OK lenses after seeing an ophthalmologist in Shiji-azhuang People's Hospital from January to June 2019 were selected as the OK lens group,and a total of 289 patients who wore framed glasses during the same period were selected as the framed glass group.After 2 and 4 years of wearing,the in-crease in axial length(AL)of the patients was observed.The patients were divided into a well-controlled myopia group and a poorly-controlled myopia group according to the changes in AL of the eyes after wearing OK lenses for 4 years.The fac-tors influencing the myopia control effect were analyzed based on random forest and Logistic regression,and a nomogram prediction model was constructed.The performance of the model was evaluated using the receiver operating characteristic(ROC)curve,calibration curve,and decision curve analysis(DCA).Results After 2 and 4 years,the diopter increase and AL increase of patients wearing OK lenses were lower than those of patients wearing framed glasses(all P＜0.001).There were no significant changes in corneal endothelial cell parameters and central corneal thickness at the thinnest point before,2 years and 4 years after wearing between the two groups(all P＞0.05).The random forest model showed that basic AL,daily wear time,correct eye health behavior,pupil diameter,daily outdoor activity time,homework time after school,and daily sleep time were the top 7 variables in importance ranking.Logistic regression analysis showed that home-work time after school was a risk factor for poor myopia control in OK lens wearers,while basic AL,pupil diameter,daily wear time,correct eye health behavior,daily outdoor activity time,and daily sleep time were protective factors for myopia control.The ROC curve,calibration curve,and DCA suggested that the nomogram prediction model constructed based on random forest and Logistic regression analysis had good accuracy,consistency and clinical effectiveness.Conclusion OK lens shows good myopia control effect,has little effect on corneal endothelial cells and corneal thickness,and demon-strates high safety.Homework time after school,basic AL,pupil diameter,daily wear time,correct eye health behavior,daily outdoor activity time,and daily sleep time are influencing factors of myopia control.Strengthening the construction of a prediction model is helpful in identifying high-risk groups with poor myopia control and guiding clinical interventions in time.

Objective To investigate the changes and related factors of maternal thyroid autoantibodies during early pregnancy. Methods Urinary iodine concentration( UIC) , serum thyroid stimulating hormone( TSH) , free thyroxine ( FT4 ) , thyroid-peroxidase antibody ( TPOAb ) , thyroglobulin antibody ( TgAb ) concentrations were determined in 7 190 women during early pregnancy in an iodine-sufficient region of China. Results The prevalence of TPOAb positivity and TgAb positivity were 8. 7% and 12. 0% respectively. The prevalence of overt hypothyroidism and subclinical hypothyroidism increased significantly in group of thyroid antibody positivity. The prevalence of TPOAb positivity and TgAb positivity presented a U-shaped curve, ranging from mild iodine deficiency to iodine excess, especially increased significantly in the group with UIC<100 μg/L. Conclusion Prevalence of thyroid antibodies positivity became higher during early pregnancy. The positive thyroid autoantibodies during pregnancy were significantly associated with maternal hypothyroidism. Both iodine excess and iodine deficiency are risk factors of positive thyroid antibodies.

Objective:In the context of China′s increasing standardized management requirements of clinical research, this article aims to explore the management methods of investigator-initiated trials in the new period, to provide possible reference for other medical institutions dedicated to clinical research.Methods:According to the requirements set forth by the＂Administrative Measures for Investigator-Initiated Trials in Medical and Health Institutions (Trial)", combined with the hospital management practice, experiences regarding the research management system construction and implementation, management system construction and its implementation effects are summarized and analyzed.Results:By exploring and summarizing the connotation of high-quality clinical research under the New Policy, tailored clinical research management system in our hospital was developed and implemented. And the hospital′s clinical research capability and level have been greatly improved, which enhancing the hospital academic influence, as well as its competence for serving the development of national and regional clinical research.Conclusions:Along with the rapid progress of clinical research, hospitals need to assure the compliance of national laws and regulations, and develop appropriate and applicable institutional management measures to empower the conduct of high quality clinical research.

Objective To investigate the epidemiological characteristics of non-toxic goiter and non-toxic thyroid nodules in the regions with different iodine intakes and the factors influencing the occurrence, development and outcome of goiter and thyroid nodules. Methods 3 385 subjects, who had taken part in the previous survey in 1999 with the ultrasonic examination of thyroid, were composed of individuals in Panshan with chronic mild iodine deficiency,in Zhangwu with more than adequate iodine "after iodine supplementation and in Huanghua with excessive iodine. These 3 groups of subjects were followed up in 2004. Results (1) The cumulative incidences of diffuse goiter in Panshan ,Zhangwu and Huanghua were 7.1% ,4.4% and 6.9% ,respectively ,being the lowest in Zhangwu (P<0.01) and those of nodular goiter were 5.0% ,2. 4% and 0.8%, respectively, being the highest in Panshan (P<0.01). (2) The incidences of single nodule were 4.0% ,5.7% and 5.6%, respectively, and those of multiple nodules 0.4%, 1.2% and 1.0%, respectively. (3)The result of logistic analysis showed that iodine deficiency,iodine excess and positive thyroid autoantibodies (TAA) were the independent risk factors for the occurrence of goiter. (4)In Zhangwu ,the incidence of non-toxic goiter in the group with positive TAA was higher than that in the group with negative TAA(P<0.01) ,while there were no such differences in Panshan and Huanghua. (5)In these three regions, the rates of positive TAA in the individuals with diffuse non-toxic goiter were higher than those in the healthy subjects (P<0.05). And in Huanghua,the rate of positive TAA in subjects with non-toxic nodular goiter was also higher than that in the healthy individuals (P<0.05). Conclusion Iodine deficiency and iodine excess may both induce the raising incidence of goiter. Nodular goiter is prevalent in iodine deficient district and diffuse goiter is the predominant form in places with iodine excess. Thyroid autoimmunity is associated with occurrence and maintenance of goiter, and this phenomenon is more obvious in the community with previous iodine deficiency followed then by treatment with more than adequate iodine.

Objective To clarify the effect of iodine intake on serum thyroglobulin (Tg). Methods A 5-year prospective study was conducted in the 3 different iodine intake areas in China [Panshan (miht deficiency) ,Zhangwu (more than adequate) and Huanghua (excess)]. A total of 3 099 people with normal serum levels of Tg in 1999 were followed and 2 448 of these participants were feasible to be observed in 2004 and included in the present study. The serum levels of Tg, thyraglobulin antibody(TgAb), thyroid peroxidase antibody(TPOAb) and TSH, thyroid volume, family and personal histories of thyroid diseases were measured and inquried. The general linear model (GLM) was used to explore the determinants of Tg. Results Among the study population at baseline, serum Tg were significantly different in three areas [7.5 (4.4-13. 1) μg/L at Panshan, 6.8 (3.6-11.2)μg/L at Huanghua, 5.9 (3.2-10.7) μg/L at Zhangwu, P<0.01]. They were associated with age, sex and the rate of positive TgAb, abnormal thyroid volume, abnormal TSH and positive personal history of thyroid diseases, in order to control the effects of confounding factors, the data from 1856 subjects with thyroid-related indexes all in normal range and without personal history of thyroid diseases were analyzed to clarify the effect of iodine intake on Tg. The serum Tg among three areas were significantly different in both 1999 and 2004, they were all increased in 5 years with significant augment (△ Tg) among the three areas[3.1 (-0.2-8.0) μg/L at Panshan, 3.5 (0.5-9.0)μg/L at Huanghua vs 2. 5(0.3-6.1) μg/L at Zhangwu,P<0.01]. The GLM analysis revealed that age, Tg and TSH levels at baseline were the determinants of △Tg in addition to iodine intake. Conclusion Iodine intake is a dominant determinant of serum Tg. Age and TSH should also be considered while indicating iodine intake by serum Tg.

The DNA characterization of Cannabis sativa L.has been one of the key directions of anti-drug research at home and abroad.Previous research mainly focused on the identification of cannabis-species and gender differentiation,and have constructed a number of corresponding composite amplification systems.With the rapid development of high-throughput sequencing technology,the whole genome of C.sativa and the sequences of key enzyme genes for its major physicochemical components have been sequenced successively,and intra-species differentiation studies of C.sativa based on specific molecular markers have gradually emerged.However,due to the high variability of cannabis subspecies-and variety-specific molecular markers,relevant foreign studies failed to provide ideal molecular marker support for the identification of intra-specific distinctions of Cannabis sativa in China.Based on this,this paper comprehensively analyzes the current situation and shortcomings of domestic and international research on intra-specific differentiation of C.sativa,and combines the previous research results of this group to elaborate on how to use high-throughput sequencing technology to solve the problem of the lack of intra-specific molecular markers of C.sativa in China.